WELCOME

Gunson historically has been renowned for its simple innovative products, that makes life easy for the automotive enthusiasts who seeks high performance and trouble free motoring.

More modern, sophisticated vehicles now require a differenttype of tool for identifying electronic problems and a new range of simple ingenious tools from Gunson allows the home mechanicand service engineer to access vital information withouthaving to spend a fortune. The range also includes robust tools for the professional mechanic that will withstand the daily pressure of the motor mechanic but at a price that is right.

Whilst most tool companies use a standard Lifetime Guaranteepromise, the small print usually limits it to faulty material ormanufacture. It does not cover misuse or wear and tear. The Tool Connection guarantee means what it says. Tools will be replaced if they are found to be defective and the company will always offer replacements or a repair if tools fail through normal use or if parts go missing.

The Tool Forum is a discussion environment for tool users and gives everyone the opportunity to have their say. Whether it’ssharing knowledge on a tool, asking other users for advice or justmaking a point - it’s open season and your opportunity to have a go.

www.gunson.co.uk

1

CONTENTS

Description Page No

Adaptor for ultimate tester/charger 12

Adaptors for Compression Tester 23

Advance Timing Lights 36

Auto Probe 6-24 volt 16

Auto Test Jump Lead Set 10pc 8

Automotive Multimeters 7

Battery Chargers 11

Battery Tester 14

BMW/Mini Cooper Service Light Reset Tool 29

Brake Bleeding Kit 19

Brake Fluid Tester 19

Carburetter Balancer 33

Circuit Tester 16

Citroen/ Peugeot Fault Code Reader 5

Clikadjust 26

Colortune Single Plug Kit 31

Compression Tester 23

Cylinder Leakage Tester - Long Reach 22

Daewoo Fault Code Reader 5

Eezibleed Kit 19

Eezibleed Pro Brake Bleeder 20

Eezilap Valve Lapper 26

Engine Analyser/Multimeter-Digital 7

Fault Code Reader OBD II 6

Fault Code Readers 5

Ford 5 Pin Fault Code Reader 5

Ford Probe Fault Code Reader 5

Fuse Kit - Automotive 15

Gastester 10

Glossary of Automotive terms 37

Glow Plug Tester 10

Hi-Gauge Compression Tester 23

Honda Fault Code Reader 5

HT Ignition Tester 34

Hyundai Fault Code Reader 5

Illuminated Fuses 15

Index 42

Key Fob Tester 18

Lambda Sensor Tester 9

Leads 8

Page12

Page4

Page18

Battery Chargers

Brake Bleeding Kit

Fault Code Readers

Key Fob Tester

Page19

2

CONTENTS CONTINUED...

Description Page No

Lo Gauge Vacuum Tester 25

Long Reach Compression Adaptor 22

Mazda Fault Code Reader 5

Memory Minders 17

Mitsubishi Fault Code Reader 5

Motorcycle Colortune Kit 32

Multi Meter Accessory Set 8

Multi-meters 7

Nissan Fault Code Reader 5

On-board Memory Saver 17

Paper rolls 2pc -77016 & 77016 14

Pocketmeter 2 7

Polarity Circuit Tester 15

Printer Battery Testers 14

Remota Start 25

Reservoir Caps 19

Rover Fault Code Reader 6

Rover Service Light Reset Tool 28

Saab (UK) Fault Code Reader 7

Service Reset Tool - BMW/ Mini Cooper 29

Service Reset Tool - Rover 28

Service Reset Tool - VAG 30

Start Check Battery Tester 14

Starter Switch Remote 25

Suzuki Fault Code Reader 6

Tappet Adjuster 26

Timing Light - Workshop 36

Timing Lights 36

Towing Socket Tester 17

Toyota Fault Code Reader 6

Trailer Socket Tester 17

Trakrite 27

Vacuum Pump 21/24

VAG Service Light Reset Tool 30

Valve Lapper 26

Vauxhall Fault Code Reader 6

Vehicle Memory Saver 17

Volkswagen/ Audi Fault Code Reader 6

Wheel Alignment Gauge 27

Multi-meters

Page7Service Reset Tools

Timing Lights

Trakrite

Page27

Page28

Page35

3

DIAGNOSTICS

OBD

The system is so simple that retrieving vehicle faultcodes does not require particular skill. However, inorder to read these fault codes some equipment isnecessary. A Code Reader is used to instruct thevehicle's ECU to download fault codes and presentthem to the user on a display. The Code Readerwill activate that part of the On Board Diagnostic(OBD) programme which identifies the defectivecomponent and cause a code to be displayed

EOBD II

Only recently have there been moves to a standard 16 pin socket as used in the late 1990'sand compulsory with OBD II standard from year2001 onwards in Europe.

It is now mandatory for diesel and LPG engines to comply with this legislation and Gunson arecurrently developing a Fault Code Reader for these vehicles.

A full list of Fault Codes relevant to each Fault CodeReader is included in each kit and a full list of codesis available in the Auto Data Diagnostic TroubleCode manual available from the Tool Connection.

OBD I

Prior to 1995 vehicle manufacturers useda connector type unique to their own cars

FAULT CODE READERS

Modern vehicles have electronic control units (ECU)

that are able to identify faults and record these in a

memory. The system was first introduced on engine

management control units with electronic fuel

injection around 1986. It is now virtually universal to

all PETROL engine vehicles. This is a great benefit

to service personnel as it can considerably simplify

vehicle repair. The vehicle faults are stored in the

vehicle's ECU memory as FAULT CODES.

4

77004

See overleaf for part numbers

DIAGNOSTICS

Manufacturer Model Management System/Engine Year Part NoAUDI

DAEWOO

FORD 5 PIN

FORD

HYUNDAI

HONDA

MAZDA

MITSUBISHI

NISSAN

80 1.6/2.0V8 4.2 100 2.6 V6

Nexia 1.5 GLi/GLXiEspero 1.5GLXi/1.8CDi/2.0 CDXi

Escort/OrionGranada/ScorpioSierra/SapphireCosworth 2.0Transit

Probe 2.0i

Lantra 1.6i/1.8iSonata 2.0/2.4S coupe

CivicDX,Bali,Civic,Civic

BalladeIntegra, Concerto,

Accord,

Prelude,

Legend

Xedos 6/9 1/6 2.0i/2.5626 1.8/2.0/2.5MX3/5 1.6i/1.8323 1.3i/1.6i

Galant 1.8i/2.0i2.5Colt Lancia 1.5i/1.8Sigma 3.0Shogun 3.0

Micra 1.0/1.3Sunny 1.4i/1.6i/1.8Almera 1.4i/1.6iPrimera 2.0E,ZX 2.04x4, 200SX

ABM/ABTABHABC

Multec

1.6 CVH KE JETRONIC EFI with catalyst2.0 OHC EFi (non cat)2.4 V6 EFi (non cat)2.8 V6 EFi2.9 V6 EFi (non cat)2.0 OHC EFi (non cat)2.8 V6 EFi2.9 V6 EFi (non cat)Weber Marelli Injection System 4x4 catalyst2.9 V6 EFi (non cat)

FS / MECS System

4G4DN / MPiG4AP / MPi1.5i (Turbo) MFi

1.3 16v/1.2 16v1.5i1.6i1.6i 16v CRX1.5i1.5i/1.6i1.5i/1.6i1.6i/1.6i2.0i2.0i/2.2i2.3i2.0i2.2i/2.3i2.5i2.7i

FP/FS/FE/KLBP/B6-ZE B3/B6/KLB6E/BPBPE

4G93 / 4G634G936G726G72

GA16DS/GA16DEGA1.6i engineCA14/16/18DEGA16DE

SR20DE / SA18DET/ SR20DET

1993

1995-1995-

1986-1990

1986

1986

1986-1990/92

1994

19921992

1991-951986-891987-19911988-19911986-19891991-19951991-19951989-19951986-1990-1993-1990-1992-1986-19881987-1991

1993-1990-1990-19911990

1993-1992-1990-1990-

1993-1989-19951990

1989

OBD I Fault Code Readers:

G4155

G4164

G4160

G4162

G4156

G4165

G4162

G4156

G4158

ELECTRONIC CONTROL UNITS (ECU)

5

These codereaders are very specific and must have correct engines code and system to be correct

ECCSSystems}

With PGM-FiSystems

MPi Systems}EGi-MPi Systems}

DIAGNOSTICS

Manufacturer Model Management System/Engine Year Part NoROVER

SAAB

SUSUKI

TOYOTA

VAUXHALL/OPEL

825827216/416620623618All V6 SOHC

900 I 16v900 Turbo & S Cat 9000i 16v Cat9000 Turbo9000 Turbo9000 2.0 Ecopower 16v9000 2.3i 16vCD 2.3 16v Turbo900 2.5 V69000 3.0i V6900 2.0i/2.3i

Swift (SF) GT 1.3i

Vitara 1.6i 8v/1.6i 16v

Carina E 1.6i/ 2.0iRAV4 SxA10 CATCorolla 1.6i 4x4Camry 2.0MR2 SW20 NO CATMR2 160HCCelica 2.0 / 2.0i GT / CATCelica CAT

Corsa, Nova, TigraKadett-E,Astra-E,Belmont,Astra-F,Calibra,Cavalier, Vectra,Carlton,Omega, Senator BFrontera, Monterey

PGM-Fi

Bosch LH 2.4/ 1985cc B202 Bosch LH 2.4/ 1985cc B202 Bosch LH 2.4/ 1985cc B202 Bosch LH 2.4/ 1985cc B202 Bosch LH 2.4/ 1985cc B202 Bosch LH 2.4/ 1985cc B202 Bosch LH 2.4.2Bosch LH 2.4.2Bosch Motronic 2.8.1Bosch Motronic 2.8.1Bosch Motronic 2.10.2/2.10.3

3S-GE/4AGEL/4A-GE/3S-FE/4A-FE

G13B/G16A/H20/G10A,G13A

4A-FE / 3S-GE/ 3S-FE3S-FE4A-FE3S-FE3S-FEGel Engine

3S-FE

ABD/AMM/ABSABF2EAAAAAA9AAAM

1986-881988-961989-1993-1996-1995-971986-1996

1988-19931988-19931988-19931991-19931989-19931988-19931990-19911990-19911994-1994-1993-

1986-1992

1991-19961992-1994-1988-1987-1991

G4165

G4159

G4157

G4157

G4155

UNIVERSAL All vehiclesmanufactured after 1st Jan 2001

EOBD compliant management systemsISO 9141-2ISO14230-4 (Keyword slow)ISO14230-4 (Keyword fast)ISO11510-4 41,6 KBPS PWM (Ford J1850)ISO11519-4 10.6 KBPS vpw (i1850)

2001 77004

OBD I Fault Code Readers - Continued:

EOBD II Fault Code Readers:

6

TCCS/TDCL}

DIAGNOSTICS

MULTIMETERS

The Gunson range of Multi-Meters includethose for complex engine managementdiagnostics through to a simple tester for basicbattery testing of toys, appliances etc.

To assist with most electrical jobs Voltageand Resistance would be all you need butfor the more complex automotive needscertain functions like Dwell, RPM, Tachometer, Duty cycle and temperaturemeasurements are required.

To make it simple to select a Gunson productthe following coding indicates the use andlevel of expertise required.

A basic multi-meter with volts andresistance measurements with relatively low ranges

A basic multimeter with Volts andResistance measurements with relatively low ranges but withtemperature measurements

A professional multi-meter with higherranges in standard measurements, AC current and capacitance

An automotive multi-meter with higherranges in standard measurement plusadditional diagnostic functions includingDwell, Duty Cycle, RPM, Tach etc

Classed as an engine analyzer this multi-meter gives full automotive functionsincluding Duty Cycle and ranges upto15amps but no AC measurement

A basic multi-meter for general purpose testing of appliances, tools,toys, computers and accessories etc. Also suitable for electrical faultfinding on circuits, ignition systems, battery charging systems, lighting,instrument panels and wiring looms

A basic multi-meter for general purposetesting. Complete with temperatureprobe for automotive diagnostics

A professional multi-meter for house-hold testing in the home, office and workshop. Added featureincludes illuminated probe for work indark areas and AC current measurement

A diagnostic multi-meter for theprofessional mechanic, technician. Full automotive functions (No temperature measurement)

A diagnostic multi-meter for theprofessional mechanic, technician.

7

G4195

G4143

G4169

G4187

G4142

DIAGNOSTICSPART No DESCRIPTION BASIC FUNCTIONS ADDED VALUE SPECIFIC

AUTOMOTIVE FUNCTIONS

Pocket Meter 1 Basic Functions Digital Display, dataUp to 10amps hold, batteries

Pocket Meter 2 Basic Functions Digital display, dataUp to 10amps hold, temperature

probes, audiblecontinuity tester,crocodile clips,batteries

Pocket Meter 3 Basic Functions Capacitance, ACcurrent, Digitaldisplay, Temperatureprobe, plusIlluminating probe,Data hold, batteries

Automotive Basic Functions Large Digital/ Dwell angle 4/6/8Analogue display, cyl, Tachometer, Data hold, RPMtemperature probes,crocodile clipsadaptors, rubbershroud with stand,batteries

Engine Analyser Basic Functions Digital display, Dwell angle 4/5/6/8crocodile clips cy, Duty cycle,adaptors, automatic Tachometer, RPMpower off, over rangeindication signal,holster with stand,batteries

Multi Tester Leads High quality replacementtest leads for mostMulti-meters

Multi meter This accessory set includes:Accessory Kit 2 probes, 2 small crocodile

clips, 2 large crocodile clips and extension leads forconnecting together.Ideal for use with anyMulti-meter

Auto Test Jump For a variety of automotive Lead Set 10pc test situations including,

bridging power from a relayto an electrical component, extending a test lead, probe situations or bridging power from electrical feed to components

Accessories

8

Basic Functions: DC VOLTAGE, AC VOLTAGE, DC CURRENCY RESISTANCE, DIODES, CONTINUITY

All Gunson Multi-metersare exempt from ROHS legislation

G4187

G4142

77011

77019

77020

G4169

G4143

G4195

DIAGNOSTICS

Contents:

20 segment quick response LED display, measuring voltage in the range 0 to 1 volt Power Connection Leads/Signal probe lead Wire piercing probe:Used to pierce a wire wherethe signal probe lead can not be readily connectedto a terminalTerminal probe: Used to slide along a wire into theback of a connector

LAMBDA SYSTEM SENSOR

Modern engine management systems depend oncontinuous feedback to the electronic control unit(ECU) from an oxygen sensor, also known as aLambda Sensor. It is fitted to the exhaust system to ensure correct fuel injection control. This istermed CLOSED LOOP operation and it maintains aprecise exhaust oxygen level essential for vehiclesfitted with catalytic converters.

Without feedback of the correct Lambda sensoroutput, the system operates inefficiently in OPENLOOP with poor economy and performance,excessive levels of poisonous exhaust emissionsand with consequent damage to sensor andcatalytic convereer.. The Lambda System Testermeasures the sensor out with accuracy and highresolution, responding as rapidly as the petrolinjection ECU. It is suitable for exhaust gas oxygen(EGO) and also heated exhaust gas oxygen(HEGO) sensors.

The Clear visual display on a LED bargraph helps todetect discrepancies and pinpoint errors. Thismakes the Lambda System Tester suitable forprofessional and DIY use

Suitable for:

• All vehicles fitted with Catalytic Converters• Some high specification petrol injected

earlier engines

• Tests operation of Lambda Sensor• Tests ECU Fuel Injection Control System• Works off Vehicle's on-board battery• Avoids Catalytic Converter damage• On-board sensor testing

LAMBDA SYSTEM TESTER

9

G4128

DIAGNOSTICS

GASTESTER - DIGITAL

Vehicle Exhaust Co Gas Analyserwith Pulse Pump

Gastester is used for the testing and setting of allcarburettors (petrol, leaded or unleaded) and petrolinjection systems on any vehicle.Gastester provides a simple and inexpensivemethod of showing the correct air/fuel ratio.

The simple procedure ensures settings are within thevehicle manufacturers' tolerance limits for COcontent in the exhaust gas

Calibrates in air, no moving parts to wear out. No filters to change. Accurate to 0.5% C.O. measurement.

Contents:

Gastester instrument including collector box and pulse pump/water trap assemblyMetal exhaust probe with retaining springsFlexible pipes (x 3)Instruction Handbook12v DC battery supply required

10

G4125

77028GLOW PLUG TESTER

For simple electrical tests on low volt DC systems

WARNINGThis Glow Plug Tester is only suitable for use on 12volt DC systems

Operation

1. Remove the common rail to the Glow Plugs and attach the positiveand negative lead to the battery

2. The Open Circuit LED will be displayed

3. Use the probe on the Glow Plug

4. The unit will go through a test procedure starting at Test 16A then 7Aand will give a reading of OK if the plug is working. If the plug is faultyit will display OPEN or SHORT denoting it has an open or short circuitand is a faulty plug.

5. It is good practice to test the Glow Plugs when cold as this simulatesthe cold start environment common to most diesels.

6. Do not test the Glow Plug if the BATT LOW LED is displayed as thisindicates the vehicle’s battery is well below 12 volts.

7. The test usually takes between 3 to 6 seconds depending on the typeof Glow Plug

8. If the test indicates OK remove the probe.

9. If the test stays on 16A or 7A the plug has failed the test andshould be replaced

10. Remove the probe.

Most cars today are fitted with low-maintenancebatteries which require almost no electrolyte topping upand in some cases, none at all.

This has been made possible by the inclusion of thelatest alternators which ensure that the battery in neversubjected to too high a charging voltage.

The charger used at home needs to be as sophisticatedas the car's alternator if you are to prolong rather thanshorten the battery life.

The problem with maintenance-free or sealed batteriesis gassing, where electrolyte is lost with too high acharge. Chargers designed to charge a maintenance-free battery are often called automatic and cut off thevoltage at between 13.8 and 14.5v to prevent gassing.

Some automatic chargers allow the charger to beconnected permanently to the battery, topping it upwhen necessary. This float charge is useful on a carthat is laid up for periods of time.

Added Value functions on Gunson battery chargersinclude: Internal cut-out for reverse polarity, good leadlengths and large, well insulated crocodile clips

ELECTRICS

BATTERY CHARGERS

11

77026

Calcium/Calcium batteries were fitted by many manufacturers from 1997 onwards, with SMARTcharging systems. Failure to replace new batteries with Calcium/Calcium could result in damage to thevehicle’s ECU.

The new Gunson Battery Chargers handle all types ofbatteries including these new Calcium batteries and themore conventional ones fitted to older vehicles.The 4 station battery charger is ideal for the enthusiastwith several Classic Cars or Motorcycles which are notalways in constant use. Also ideal for hire cars, fleetand pool cars and service maintenance engineers.

These chargers are fully automatic Micro Processorcontrolled, switches automatically to Float mode andcharges 20% faster than standard chargers.

Specification

Charges 12v SLI, AGM, Gel Batteries / Calcium/Calcium

Input 220 - 240 V ac @ 50Hz

Charging output mode 5 amps per station

Maintenance output mode Pulse Charge

Leads 183cm

Size 19” x 7” x 4”

Weight 18.7 lbs (8.5Kgs)

Calcium / Calcium4 station Battery Charger - Fully Automatic

Calcium / CalciumBattery Charger - Fully Automatic

77027

x4

77027

77026

ELECTRICS

12

Don't forget when disconnecting a battery the radio code andcar immobilizer code may be lost. A Gunson Vehicle MemoryMinder plugged into the 12v output socket will save thesecodes effectively. See this and other accessories on Page 17

G4138

G4137

G4108

G4104

G4126

G4126BL

PART No DESCRIPTION RANGES FEATURES TYPE

G4106 Automatic BatteryCharger 7a rms Automatic Lead/Acid

continuous Permanent Float Maintenance free

Multistage Battery 5.7a rms Automatic Lead/Acid/GelCharger continuous Lower charging rate Maintenance Free

Traction

Battery Charger 4.5a rms > Lower charging rate Lead/Acid/Gel6a rms LED charging indicator Maintenance Free

Slow/Fast rate

Battery Charger 7a rms > 6v >12v Lead/Acid9a rms Slow/Fast rate Suitable for caravans

for top up charging

Battery Charger 1.2a rms 6v >12v Lead/AcidModel 1 Trickle charge Sealed

Suitable for topping upRequires supervisio

Ultimate Automatic 0.8a rms 6/12V MotorcyclesBattery Charger

Adaptor for Ultimate Allows the lead to be Tester / Charger left in situ under the

Motorcycle seat

ELECTRICS

BATTERY TESTERS

The Gunson range of battery testers utilize the latesttechnology and offer a variety of features includingthe latest testers with print out facility for updatingand recording read-outs for customers or vehicleservice records.

Instructions for Testers with Printers

Before use make sure the batteries supplied are in place.If the batteries are low INTERNAL BATTERY LOWwill show on LCD

Battery Type

VRLA

GEL

AGM

Standard SLi

The Valve Regulated Lead Acid Battery is sealed andmaintenance free with a Bunce Valve(s) in the top thatopens when a pre-set pressure is reached inside thebattery and excess gases are let out. The vlave thenresets itself.

A Gel battery is a lead-acid electric storage batterythat is sealed and completely maintenance free. Itcontains thixotropic gelled electrolyte that in non-spillable and uses a recombination reation to preventthe escape of hydrogen and oxygen gases (particularlyin deep cycle applications)

An AGM battery is a lead-acid electric storage batterythat is sealed and completely maintenance free like theGel battery but it has all of its electrolyte absorbed inseparators consisting of sponge like mass of mattedglass fibres. This battery should never be opened. Itis non-spillable and like the Gel battery will not let gasescape. Connections should be re-torqued and thebatteries cleaned periodically

This stands for Starting, Lighting and Ignition andspecifically designed for vehicles within a voltagecontrolled electrical system. Often called commercialbatteries they tend to be more robust and powerfuland used on large diesel motors.

Battery Rating

SAE

Enc1

Enc2

IEC

DIN

(Cold Crank Amps)

40-2000 CCA

50-2500 CCA

40-4100 CCA

30-1500 CCA

25-1300 CCA

The rating reflects the ability of the battery todeliver engine starting currents underwinter conditions.

13

77016

ELECTRICSBATTERY TESTERS

Digital Battery/Alternator/Starting SystemAnalyser with Printer

Digital Battery Tester with Printer

Digital Battery Tester

Paper rolls for printers

Start Check

Battery Power Tester

6-12 voltBatteries12-24voltChargingsystems

6-12voltbatteries

6-12voltbatteries

Pack of 2

12 volt

12volt batteries and alternators

Includes: LCD DisplayPrinter, 2 paper rolls,shoulder carrying case andinstructions in English,French, German, Spanishand Chinese and batteries

Includes LCD Display,Printer, 2 paper rolls,shoulder carrying case andinstructions in English,French, German, Spanishand Chinese and batteries

LCD DisplayBatteries

A simple tester for checking whether thebattery will start the engine.

Tests up to 100ampsSafety switch preventssparking. Heavy duty plated clampsLead/Acid batteries

All Gunson battery testers are ROHS compliant

14

PART DESCRIPTION USAGE FEATURES

77016

77015

77017

77018

G4107

G4184

POLARITY CIRCUIT TESTER

This tool test polarity instantly, locating short circuitswithout wasting fuses and finds bad ground/earthcontacts.

Tests polarity without connecting jumper wires.

Tests include:

• Cooling fans• Window regulator motors• Electrical fuel pumps• Relays• Lamps• Computer safe for use around sensitive

engine management systems

15

CAR FUSE KIT

A selection of car fuses that illuminate when blown.43 fuses supplied in 5/10/15/20/25/30amps, plus fuse remover.

Blown fuses are easily recognizable.

77010

77001

ELECTRICS

ROHS compliant

77023

G4166

16

LED CIRCUIT TESTER

For simple electrical tests on low volt DC systems

Ideal for testing:• Continuity• Identifying live wires• Testing DC voltage 3-12v• Vehicle battery testing• Spark plug ignition test

NOT SUITABLE FOR AC/240 volt

AUTO PROBE 6-24VOLT

Powers up components prior to fitting, testscontinuity and polarity and tracking short circuits andbad earths. Powered by the vehicles own 6-24voltDC power supply and fitted with sensitive trip deviceto prevent circuit damage. Computer safe andcomplete with 4.5m of cable.

Tests continuity in:Switches, relays, diodes and fuses, wiring looms

Powers up components prior to fittings:Cooling fan motors, fuel pumps, window and sunroofmotors, wiper motors, relays and lamps etc.

ROHS compliant

ROHS compliant

ELECTRICS

ELECTRICS

17

VEHICLE MEMORY SAVER

Many memory controlled facilities on modern vehicles are lostwhen the vehicle’s battery has to be disconnected. Thevehicle memory saver provides a convenient and safe way toavoid disruption. Simply plug into the 12v output socket andmains supply socket and the vehicle’s battery can be removedand replaced if necessary, without fuss or hurry.

What it does?

Avoids memory loss in the ECU which can cause poorperformance. Maintains lead/acid batteries which are in goodcondition but which are not to be used for sometime. Theycan be maintained in good condition by being supplied withthe low (800mA) charge the Vehicle Memory Saver provides.

Maintains• Clock settings• Radio codes (especially if the security code

is unavailable)• Vehicle security• Seat settings

G4148

TOWING SOCKET TESTER

For fast and simple testing of 12v 7 pin N Type Towing Sockets on Caravans, Trailers etc. Allows one man operation for checking rear lightconnections from the driving seat.

How it works?

Simply plug in and go through tests from the driving seat and see the results on hand held LED.

G4189

INTELLIGENT MEMORY MINDER

The intelligent Memory Minder (IMM) will maintain all of the vehiclescomputer codes whilst the battery is disconnected. The MemoryMinder is operated from the vehicle’s 12v output socket (cigarettelighter) and recharges its built in battery through this connection.

Green LED IMM battery FULLYellow LED IMM battery needs rechargingRed LED IMM battery needs recharging or replacing

Alternatively you may use a standard 13 ~14.5 Vdc power supply

SpecificationBattery size 0.7AhWorking time 14hrs

ROHS compliant (except lead battery)

77029

77013

ELECTRICS

KEY FOB TESTER

Tests key fobs for signal before being let down andunable to gain access to the vehicle.Handy key ring for secure storage.

Tests include:

• In-frared key fobs• High frequency key fobs 433/418 – 868 mhz• Stereo remotes• TV remotes• Remote garage doors• Remote gates

18

ROHS compliant

CAR KEY FOBS

TV/STEREO REMOTES

GARAGE/GATEREMOTES

MAINTENANCE

EEZIBLEED

EEZIBLEED is an automatic hydraulic Brake and Clutch Bleeding system, that uses fresh brake/clutch fluid under pressure to flush out old and used fluid from the system.The method gives simple and easy brake bleeding for one man operation and uses the air pressure from the spare tyre to perform the task (20psi maximum)

How it works?

An airtight seal on the reservoir ensures fast fluid replacement, faultless one man operation with no contamination. The Eezibleed kit consists of a special pressure vessel to hold the new fluid, a pipe with a cap to fit the vehicle's reservoir and an air pipe to connect to a tyre. When both pipes areconnected operate each bleed valve in turn until the clean fluid appears.

Eezibleed can also be use successfully on the followingsystems: Tandem master cylinders, without sensorsTandem reservoirs, Slave servos, Vacuum Servos

PART No SIZE & DESCRIPTION APPLICATION

G4062 25mm (1") Metal Cap and seal Lockhead - used on Classic Mini

G4062 27mm Metal Cap and Seal Volkswagen including Classic Beetles

G4062 44/45mm Plastic Cap and 2 seals Girling and ATE systems

G4062 46mm Metal Cap and Seal Girling systems

G4062/18 80mm Reservoir Cap Some Rover/Jaguar/Triumph

G4063 Eezi-bleed Multi Cap Kit 1 3/4" for Girling metal reservoirs

2 1/2" for Girling metal reservoirs

24mm for Fiat 500/600/850

45mm for Fiat

64mm for Girling reservoirs

80mm for Rover/Jaguar/Triumph

Includes seals and caps

G4063 24mm Fiat

1 3/4" Girling Systems

2 1/2" Girling Systems

64mm Girling

G4058 Multi-purpose Cap For radiators with neck and bayonet type fitting

What it fits:

BRAKES

If these caps are not suitable for a particular vehicle, the original reservoir cap canbe utilized to perform the same task. This may be necessary on Nissan, Toyota and Honda vehicles.

19

Instructions available in German

G4062

MAINTENANCEBRAKES

EEZIBLEED PNEUMATICBRAKE BLEEDER

• One man Brake Bleed operation• Automatic refilling design• Automatic shut-off when fluid reaches

maximum level• 2 Litre Extracting Tank• 1 Litre Refiller Bottle

How it works?

The Eezi-bleed Pneumatic Brake Fluid Extractor isvacuum operated and works on normal compressedair through a standard 1/4” adaptor. The unitcontains a vacuum fluid extractor, bleeding hosewith brake nipple adaptor and automaticrefiller bottle.

Automatic Refiller Bottle

Fill required amount of fluid into the Refiller Bottle(maximum 1 litre)Ensure the red shut off valve is in thehorizontal positionClamp the refill bottle onto the Brake or Clutchmaster cylinder reservoirOpen red shut off valve to vertical position.Fluid will start to flow as brakes or clutch are bled.

20

www.gunson.co.uk

Mark asked if we have an Eezibleedfor Motorcycles which use a differenttype of master cylinder. The standardG4062 can be used with just a simpleconversion on the cap and a new capfor the reservoir.

77021

MAINTENANCE

VACUUM PUMP

A complete kit for Vacuum Testing and it can beused for One-man Brake Bleeding.

This kit provides an uncomplicated means for singlehanded brake bleeding, without applying the brakesor losing brake fluid. This system can be used withalmost all automotive fluids.

This set provides many other automotive tests.For full details see page 22 .

Adcl Reservoirs and following not supplied.

BRAKES

BRAKE FLUID TESTER

Brake Fluid is a hydroscopic fluid that absorbsmoisture through brake hoses etc reducing theboiling point of brake fluid and causing deterioration.Regular checks on the brake fluid will ensure thebrakes function correctly and safely.

How it works?

A simple tool for testing the percentage of water inbrake fluid is the Brake Fluid tester. Simply immersethe probe end of the tester into the brake fluid andread the results.

Green indicates <1.5% water OKYellow indicates 1.5<3% water MARGINALRed indicates 3% < water FAIL

21

77003

77002

ROHS compliant

MAINTENANCE

CYLINDER LEAKAGE TESTER WITH LONG REACH ADAPTOR

One of the simplest tests for checking the condition of the engine is the cylinder leakage tester.

What it does

A cylinder head with the piston at the top deadcentre with both valves closed should be airtight.By injecting a measured amount of air into eachcylinder and checking the rate of leakage, thecondition of the sealed system can be identified.Regular compression checks are worthwhile toprevent expensive service and maintenance.

Compression leakage can result from:

• Damaged valves• Worn rings• Blown head gasgets• Cracked cylinder head

Long reach adaptors are particularly useful for deepseated plugs in Ford Zetec and Vauxhall/OpelEcotec engines.

Main advantage: You can determine enginecondition without striping down.

COMPRESSION

22

77005

MAINTENANCE

HI-GAUGE

HI-GAUGE is a compression tester that is a tool formeasuring and recording the pressure created bythe piston in each cylinder. This information is usedto diagnose faults in valves, pistons, piston rings,cylinder bores or head gaskets.

Such tests are an excellent guide to general enginecondition and can be used during routine engineservicing to give advance warning of developingproblems or for fault diagnosis.Improper compression can cause rough idling orrunning, backfiring and poor fuel economy.

Product Features

• Calibrated in Bar and Psi measurements• Suitable for petrol engines• Fits 14mm and 18mm spark plug ports• Flexi hose for easy fixing• Coloured bands compiled from manufacturer’s recommendations

NB It is normally accepted that a variation of 1 Bar(15psi) between any two cyclinders is an indicationof a fault.

Low compression pressures can be caused by:

Insufficient valve clearancesWorn piston rings or cylinder boresPoor valve seating or burnt valvesLeaking head gaskets

High compression can be caused by:

Excessive valve clearancesFluid (oil, petrol, water) in the engine or cylinder

COMPRESSION

23

G4101

MAINTENANCECOMPRESSION

24

VACUUM PUMP

A complete kit for Vacuum Testing and One-manBrake Bleeding.

Product Features

This set provides many tests including:• Automatic transmission, Vacuum reservoirs• Air Conditioning and Heating, Heater Cones• Brake Systems (incl ABS and conventional)• Engine management systems, • Emission Control Systems, Engine tuning• Fuel System• Ignition Systems• Engine maintenance including:

Cylinder Head, Valve Stem Oil SealsPiston ring retainer on Diesel enginesWaste gases on Turbo chargers

• BRAKE BLEEDING see page

Contents

Gauge 0-30 In/hg 0-76Cm/hgBarbed brass hose fittingRelease valve`T' Fitting600mmTapered hose adaptorUniversal fitting adaptorCushioned handle gripRobust steel frameBrass cylinder for durability

77003

MAINTENANCE

LO-GAUGE – VACUUM GAUGE

This vacuum gauge is a useful item for and DIY carmechanics tool box. Easy to use and ready to beconnected directly to the inlet manifold of most carsusing the adaptors provided in the kit.The instrument has a range from full vacuum to10psi and the scale is calibrated in ins/hg ofvacuum.The multi-coloured scale carries a lot of usefuldiagnostic information

Product Features

Suitable for use on Cars, Light Commercials,Motorcycles, Boats, Industrial Motors and smallagricultural or farming equipment with petrol engines

Diagnostic tests include:

• Engine spark misfires• Leaking and sticking valves• Leaking head gaskets• Incorrect mixture/ignition timing• Incorrect valve timing• Manifold and carburettor air leaks• Fuel economy metering• Balancing multiple carburettors• Measuring turbo boost on some cars• Pump testing (suction and delivery pressure)• Vacuum servos• Fuel pumps

COMPRESSION

25

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On some vehicles a junction box is located on the bulkhead or wing to whichthe pre-engaged type of starter motor is connected. Remota-Start can beconnected to this. Connect one lead towhere the battery supply comes in and one to the other thinner wire terminal, with this thin wire disconnected here or at the starter motor.

STARTER MOTOR

Remota Start

Suitable for all cars (and light commercials)including petrol and diesel engines.For testing, tuning, adjusting and checking theengine from beneath the bonnet.

G4103

G4086

G4094

G4095

MAINTENANCE

CLIKADJUST-MICRO METER TAPPET ADJUSTER

Valve clearance is easy to adjust on all push rodengines or OHC engines with top adjustment.Clikadjust makes the job even easier and absolutely precise.This essential clearance adjustment ensures valves(both inlet and outlet) open and close correctlyresulting in better engine performance. An essential tool for worn tappets.

Too little clearance goes unnoticed until valves fail to close and compression and power are lost. This can burn valves causing costly replacements or even causing an engine fire.

Too great a clearance though not so dangerousresults in noise, lost performance anddriver irritation.

Suitable for:

• All push rod engines• All OHC engines with top adjustment• Inlet and Exhaust valves• All types of tappets including equal and non-equal• All types of threads• No need for feeler gauges

A tool that fits your vehicle’s adjustment nut willbe required.

TAPPETS

EEZI-LAP – OSCILLATING VALVE LAPPER

Good engine performance depends on properlyseated and sealed valves. Badly seated or burntvalves and worn guides and stems result in hotgases escaping under compression reducingperformance and increasing engine damage. Loss of power and poor starting are symptoms.

What it does

• Laps valves in double quick time• Produces gas tight seals in seconds• Converts rotary drill to oscillating

action/grinding motion• 22/28mm sucker heads fit most valves• Fits all power drills with normal 5/16” (8mm) chuck• Essential on multi-valve engines

VALVES

26

MAINTENANCEWHEEL ALIGNMENT

TRAKRITE

Trakrite is the simplest, most accurate device forchecking the alignment of the steered wheels of carsand light commercials. It is a roller bearing platformover which one front wheel is slowly driven with thewheels in their straight ahead position.

Because of the roller bearings between the base andthe top plate of the Trakrite, any sideways stressbetween the tyre and the road surface will cause thetop plate to move sideways. This movement islinked to a pointer which shows if adjustment isneeded and in which direction.

How will it work?

It is not necessary to know the toe-in or toe-outangle needed for the vehicle. If the correct angle isset there is no sideways stress between wheel androad and the Trakrite will show this.

Suitable for the professional user, fleet operator orprivate motorist

For a small movement of the pointer (ie up to 4divisions, each division of the scale approximatelyequals one quarter of a degree Toe in/out error. Thepointer at its full movement indicates 3 degrees toein/out error. This relationship is correct for all wheelsizes.

NB It is important to note that Trakrite does notmeasure the actual Toe in/out angle, but measuresthe error in the Toe in/out setting. When the Toein/out is set correctly, there will be no movement ofthe pointer when Trakrite is used.

What it does

• Avoids tyre wear• Checks alignment on any level surface• Tests accurately in only 5 minutes• Easy and simple to operate with no technical

knowledge required• Virtually indestructible• Reveals Toe In or Toe Out

Just line it up, drive over for unmistakable results.

Suitable for the professional user, fleet operator orprivate motorist.

27

G4008 G4008

MAINTENANCESERVICE LIGHTRESET TOOLSService Light Indicator Reset Tool -Rover 75/MG-ZT

This simple tool plugs into the ECU via the 16pinEOBD port on Rover 75 and MG-ZT vehicles

The EOBD port can be found under the fascia panelon the driver's side of the vehicle

Instructions

1 Plug into EOBD port2 The green light will indicate connection3 Press OIL for re-setting the oil service indicator4 The counter will reset to 15,000 miles

OR

3 Press INSPECTION for resetting the serviceinspection indicator

4 The counter will reset to 15,000 miles

28

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

77022

ROHS compliant

MAINTENANCE

Modern vehicles have electronic control units (ECU)that are able to identify faults and record these in amemory. The system was first introduced on enginemanagement control units with electronic fuelinjection around 1986. It is now virtually universal toall PETROL engine vehicles. This is a great benefitto service personnel as it can considerably simplifyvehicle repair. The vehicle faults are stored in thevehicle's ECU memory as FAULT CODES

To reset these service indicator lights vehiclespecific reset tools are being introduced to themarket. Some fault code readers have their ownbuilt in reset procedures.

RESET TOOL - BMW

Applications

This tool will also reset the Air bag service indicators included on the following models

FOR SAFETY REASONS SERVICE ON AIRBAGS SHOULD ONLYBE CARRIED OUT BY A QUALIFIED TECHNICIAN

Manufacturer Model Year

BMW E32/E34/E36/E38/E39/E46/E60/E63/E64/E65 2000 -

X5 2000 -

Z Roadster 2000 -

Coupe/Compact 09/2000

Mini Cooper 2000 -

SERVICE LIGHTRESET TOOLS

29

Manufacturer Model Year

BMW Z3 Roadster 2000 -

Coupe/Compact 1987 - 2000

E20/E32/E34/E36/E38/E60/E63/E64/E65 1987 - 2000

E46/E39/X5 09/2000

Mini Cooper 2000 - 02/05

77006

ROHS compliant

Manufacturer Model

Audi A2/A3/S3/A4/S4/RS2/RS4/A6/S6/A8/S8/TT

Volkswagen Golf IV, New Beetle, Sharan, Passat, Lupo, Bora, Caddy, T4, Polo

Seat Arosa, Ibiza, Cordoba, Toledo, Leon, Alhambra

Skoda Octavia, Fabia,

Ford Galaxy

Applications

Year Code Service Km

1994-09/2003 Oil Oil service 15000

IN1 Inspection 1 30000/365 days

IN2 Inspection 2 30000/730 days

Service now INT1/2 15000/365 days

Service in

Longlife 3.5.1 Service now

6/1999 Service in

Oil (15000km) is automatically programmed together with IN1/IN2

RESET TOOL - VAG

30

77007 77007

MAINTENANCE

ROHS compliant

PERFORMANCE

Colortune

COLORTUNE is a unique mixture setting device anda detector of other mixture related problems. It is asparking plug, which runs the engine like any normalsparking plug, but because it has a glass insulator, itallows the colour of the combustion flame, inside thecylinder, to show through it, thereby indicating thestrength of the mixture or other faults.

How will it work?

Understanding the principle by which Colortuneworks helps in getting the best results. Thatprinciple is commonly seen in action on paraffinheaters, gas cookers or anywhere a fuel is burnt inthe air to produce heat or energy.

Combustion at its most efficient produces aclear blue flame, various colours result ininefficient mixtures.

Inside an internal combustion engine those samecolours are present though not normally seen. WithColortune fitted, in place of a spark plug, the flameis visible through the glass insulator and the fuel isignited by a spark in the Colortune.

What it does?

Colortune provides a unique view of the behaviour ofthe fuel system, in the individual cylinders, oftensaving expense on costly fault diagnostics.COLORTUNE will set the mixture very accurately,if used correctly, avoiding most petrol wastage,

ensuring better performance and cleaning up theexhaust to a great extent.

What it fits?

COLORTUNE will fit most vehicles. The standardplug has a 14mm diameter plug thread just like mostsparking plugs. Adaptors to allow it to be fitted to allother vehicles, boats, motorcycles or even lawnmowers, are readily available to fit 18mm, 12mmand 10mm sizes.

CARBURETTORS

31

G4074

PERFORMANCESTANDARD 14MM COLORTUNE

Colortune will fit directly, with no adaptor required, to most current production cars sold in the UK with the exception of some large Fords which use a large sparkplug with an 18mm thread.

It will also fit Motorcycles with 2 stroke engines almost universally as there are no space restrictions caused by valves

It will also include most garden machinery and power plant engines

NB Colortune will fit directly with no adaptor required, cars such as Ford Escort and some Peugeot etc, which use 10mm plugs. These are slimline plugs which nevertheless have the normal 14mm plug thread. Some engines use taper seat plugs, but the standardColortune can be used with these simply by using the thick copper washer provided with the kit, avoiding the need for a taper adaptor.

COLORTUNE PLUS AN 18 MM ADAPTOR

With the 18mm adaptor the Colortune will fit large Fords,American and other foreign cars plus some classic cars.

COLORTUNE WITH A 10 MM OR 12 MM ADAPTOR

Most motorcycles. No cars require the use of these adaptors.Four Stroke Motorcycles - a thread size of 14 mm, 12mm or occasionally. 1Omm, is used. The spark plug manufacturersreference code helps with identification.

PART No DESCRIPTION APPLICATION

G4074 Colortune 14mm Most cars, light commercials, some motorcycles and garden machinery.

G4171 Colortune 12mm Two stroke motorcycles

G4172 Colortune 10mm Two stroke motorcycles

PART No DESCRIPTION APPLICATION

G4055A Adaptor 10mm Two stroke motorcyclesG4055B Adaptor 12mm Two stroke motorcyclesG4055C Adaptor 14mm SlimG4055D Adaptor 14mm Long ReachG4055E Adaptor 18mm Large Ford cars, American and other foreign imports

plus some Classic cars

32Instructions available in French / Spanish / Portuguese

COLORTUNE KITS AVAILABLE

Additional adaptors available

PERFORMANCE

CARBALANCER

Internal combustion engines use a mixture of air and petrol to generate their power. The performancetherefore is influenced by the air flowing into it and the petrol that is metered out by the carburettor.Unless the air flow in Twin or Multiple carburettors is correctly set, the correct mixture adjustment isunlikely to be achieved.

How it works

Carbalancer measures and indictates the air flowvery simply and accurately so that each carburettorthrottle butterfly can be synchronized to give thesame balanced air flow. Carbalancer with its unique micro metering head and easily read scaleindicates the air flow and allows accurate air throttle calibration.

Suitable for use on SU, Solex, Auto-Lite, (Formoco)Stromberg, Weber and Zenith and can be adjustedto fit most carburettors including side-draught,down-draught with air intakes (Venturi) from 25mmto 67mm (1-2”) diameter.

What will it do

• Improve performance• Produce more miles to the gallon• Smoother and better acceleration

CARBURETTORS

33

G4053

PERFORMANCE

FLASH TEST- VEHICLE HT IGNITION TESTER

Flashtest is designed as a simple but effectiveinstrument to test and measure the high tensionvoltage of a motor vehicle. Flashtest checks for a good spark, checks for good starting and evenrunning and is useful on any vehicle with anyignition system.

How it works

Detects faults in:

• Points• Coil• Distributor• Plug Leads• Rotor Arms

Checks for Flashtest:

• There is adequate high tension (HT) supplyto the spark plug

• The spark has deteriorated since a previous measurement

• Detect existing faul conditions which arecausing difficult starting, reduced engine power or increase fuel consumption

• To assess the HT voltage

The most common causes of low ignition voltage or missed sparks:

1. Faulty or incorrectly adjusted contact breaker points

2. Faulty HT leads3. Faulty capacitor (condenser)4. Faulty distributor cap or rotor arm5. Faulty ignition coil6. Faulty ballast resistor (if fitted)

HT LEADS

34

G4079

PERFORMANCE

The Timing Light is an essential tool for engineswith adjustable timing (which is done by alteringthe position of the ignition distributor).

With electronic control of timing and advancefound on most modern engines, the roll of atiming light has been somewhat reduced to fault

diagnostics rather than adjustment.

All new timing lights are required to comply withCE regulations and therefore will have a Xenon lightinstead of the old Neon light. This Xenon lightprovides a brilliant blue/white light which can beseen in daylight or even the brightest of workshops.

The Purpose of Engine Timing

To make sure the spark in each cylinder, occursat the right instant for most efficient ignition of the

petrol and air, this varies enormously for differentoperating conditions. Even on the most up-to-datevehicles accurate ignition timing is an essentialrequirement. However many aspects of the timingrequirements of the engine are now take care ofby the engine management system.

How does a Timing Light work?

A bright flash of light occurs at the same time asthe ignition spark. This illuminates the timing pointerand mark on the rotating engine and freezes theimage for that instant. Just by looking at the timingmarks you can see the position of the engine whenthe spark occurs. Initial or basic timing is usuallydone at idle speed. At higher speed the sparkhappens earlier (timing is more advancedand the advance dial on some lights makes iteasier to test this accurately.

The dial seta a calibrated delay in the flashingof the tube until the user can see the timing markare aligned (as they were before the enginespeed was raised)

35

IGNITION TIMING

Timing Lights

77008

PERFORMANCE

Basic functions for modern Timing Lights

• Xenon light

• Inductive pick-up

• Suitable for petrol engines with 12v ignition systems

• Reverse polarity and overload protection

• Clear concise instructions

• Can also be used on 6/24v vehicles withseparate 12v supply

Advanced functions

• RPM Indicator

• Advance dial

• On / Off trigger

Part No Description Functions Additional Information

Xenon Timing Light All Basic Functions Lightweight,Super bright Xenon plastic casebulb

Superstrobe All Basic Functions Die cast body Professional All Advance functions 200-9990 rpm

Workshop Timing Light All Basic Functions Die Cast BodyAdvance Dial Up to 8000rpm

Advance Xenon All Basic Function Lightweight,Timing Light Up to 8000rpm plastic case

Super bright Zenon BulbAdvance Dial

Spare Xenon bulbs can be obtained direct from The Tool Connection

36

ROHS compliant

G4113

G4123

G4133

77008

GLOSSARY

AC (ALTERNATING CURRENT)Current electricity generated mechanically, which changes direction at veryfrequent intervals. (See DIRECT CURRENT ).

ADVANCE DIALThis is the mechanism in some timing light which delays the flashing of the tube tocoincide with a particular timing mark which may not otherwise be visible, or it cancoincide with a new mark applied to meet a particular timing requirement.

AMPS (A)The electrical unit of current which represents the flow in an electrical circuit.

ADVANCE / RETARD MECHANISM A system to make the ignition spark happen earlier or later, to take account ofengine speed.

ANALOGUE / DIGITAL Sometimes the description of multimeter display, the former uses a pointer passingover a scale card and the latter uses a liquid crystal display (LCD). More widely,these names apply to the way electrical signals convey information, either bycontinuous wave or by chopped up binary codes.

AUTO POWER OFFThis automatically switches off a device to save the battery.On better multimeters there is a warning of this and the reading is retained.

AUTORANGINGAutomatic selection by a multimeter of the most efficient scale on which to displaya reading. In the case a tachometer (RPM) scale, sometimes it is split into clearersections and the multimeter skips back to the start of the next section as itreaches the top of the previous one.

BAR GRAPHA special scale divided into segments which indicate variations of a component'sperformance. In use it provides the advantages of an analogue display.

BASIC TIMINGThe underlying adjustment of the ignition and mechanical components of an enginewhich gets them to work together correctly.DC electricity. In vehicles the main type is called lead/acid. This name describesthe contents of a battery, which interact converting chemical energy intoelectricity. Although the lead/acid lasts for a long time if the battery is in use givingout its charge and being recharged, eventually they are used up and the batteryhas to be replaced.

CAM ANGLE (DWELL ANGLE) The distance round the cam on the shaft of a distributor which controls the timeduring which the contact breaker points, in conventional ignition systems remaintogether. The first term is used about motorcycles while in other vehicleell is usedand can be remembered as the period of distributor rotation during which thepoints are closed (or “are dwelling together”).

CARBURETTOR The traditional device for mixing air and petrrol in the correct or useful proportions.

37

GLOSSARY

CATALYTIC CONVERTER A device attached to the exhaust system through which the residual gases ofcombustion pass. These are broken down by it into harmless substances usingoxygen and a heated catalyst (or chemical stimulant, which assists the process,usually platinum).

CHARGING SYSTEMThe electrical system of a vehicle which produces current which can be stored in the battery.

CIRCUITThe path along which current electricity flows.

COCarbon Monoxide, a poisonous gas produced by combustion. The volumeproduced in a vehicle engine is directly proportional to the ratio of the petrol/airmixture. Vehicle manufacturers use it to indicate how an engine should beadjusted for peak performance. Governments use it to check how well oldervehicles are maintained.

CONDENSER (CAPACITOR)A device for storing or absorbing excess current in the circuit, e.g. in contactbreaker points to minimise arcing.

CONTINUITYIn electrical circuits with no restrictions or breaks continuity is perfect. Thereforea multimeter can be used to test for resistance (or loss of continuity) at variouspoints in a defective circuit and by a process of elimination identify faults..

D.I.S. - (Distributor less Ignition System)An electronic alternative to the conventional distributor used to transmit sparks tothe plugs

DC (DIRECT CURRENT)Current electricity which flow in only one direction.

DETACHABLE LEADSBetter quality multimeters and timing lights have replaceable leads, some of whichhave just pointed ends for probing circuits whereas others have screw-on crocodileclips to attach to components.

DIODEA one-way gate in an electrical circuit, usually used to protect a circuit or a deviceagainst reverse connection or flow. Also used to turn AC current in to DC.

DISTRIBUTORThe traditional means of directing timed ignition sparks to the cylinders in thecorrect firing order. These days these tasks are performed by electronic ignitionmodules

DWELLSee CAM above

ECM - (Electronic Control Module)The “computer” used to manage certain aspects of modern engine functions. The more advanced types control many functions very efficiently, while optimising reliability. Sometimes incorrectly called the ECU (unit).

38

GLOSSARY

ENGINE MANAGEMENT SYSTEMJust another name for the vehicle's computer (See previous entry).

FREQUENCY (Hz)A measure of the recurrence of events such as rotation or vibration. This is in some ways like RPM measurement

FUEL INJECTION (PI)The modern vehicle uses a system of petrol injection instead of a carburettor to mix the petrol and air. PI does this more efficiently and is more easily controlled by the ECM.

FUSEA specially designed weakness in an electrical circuit which fails before anydamage occurs to more valuable parts.

GAS ANALYSERA device for displaying the levels of various gas emissions from vehicle exhausts.The most important ones being CO (carbon monoxide), CO2 (carbon dioxide), HC (hydro carbons) and oxygen.

HCUsually unburnt petrol resulting from engine mis-firing or badly worn exhaustvalves.

HIGH IMPEDANCEIn multimeters this characteristic ensures that electric current does not passthrough the meter and into a delicate circuit enough to do any damage.

HT LEADSThe conductors of high-voltage (HT) current between the distributor, coil and thesparking plugs. (The T actually means tension).

IGNITION SYSTEMThe electrical system on a vehicle which produces the sparks in each cylinder.

IGNITION MODULE An electronic device replacing the distributor points/condenser and performing the same function more efficiently.

IMPEDANCEIn electrical circuits, the total restrictions to the free flow of current through thecircuit. HIGH IMPEDANCE - see above.

INDUCTIVE PICK-UPA clip-on detector of radio waves used to sense the flow of current.

LAMBDA SENSORAn electronic sensor which detects oxygen in the exhaust system.

MANUAL OVER-RIDEThe facility on multimeters to change from AUTORANGING ( see above) to a scalewhich the user selects.

39

GLOSSARY

MIXTURE (PETROL)This is the term applied to combination of petrol and air which is dispensed by the carburettor or petrol injection system, from which the engine derives itsenergy to perform. The mixture (sometimes called the air fuel ratio) is important to ensure that thecombustion process works at its most efficient. If there is too much petrol, all of it will not burn because of the shortage of oxygen and this unburnt petrol will cause the combustion colour to be yellow/orange (as seen through Colortune).This will result in wasted petrol and a dirty exhaust.If there is insufficient petrol, the engine will overheat and be under-powered. This too can result in over consumption as the engine may need to work harder then necessary.

MULTIMETERAny device for revealing the characteristics of current electricity.

OBD - (Onboard Diagnostics)A system within the ECM of storing and identifying faults that occur in the performance of the engine and associated electrical systems.

OHMThe electrical unit for resistance in a circuit ( ).

OHM'S LAWThe relationship between voltage, current and resistance. Namely,RESISTANCE = VOLTAGE DIVIDED BY CURRENT

PERIODThe time between pulses of current, it is measured as an extra aid tounderstanding what is going on in a circuit.

PROTECTED AGAINST MISCONNECTIONBetter quality multimeters and other devices have special circuits which ensure nodamage can occur to delicate components as a result of connecting leads thewrong way round.

PULSE WIDTHUsed to test vehicles fitted with electronic ignition and petrol injection systems,and driven by pulses of electricity. The duration of these pulses is as significanton these vehicles as dwell was on older, conventional ones.

RESISTANCEThis is the restriction in an circuit which tries to stop the flow of current electricitythrough the circuit. A conductor has low resistance whereas an insulator has veryhigh resistance: between these two extremes, varying levels of resistance occur asa result of faults or because components introduced to achieve desired effects.RPM INDICATOR - this term is applied by Gunson to other methods of indicating

engine speed without the expensive components of a conventional tachometer.

SOLID STATEThe description given to integrated circuits now rarely used (see Glossary Extra below).

40

GLOSSARY

STROBOSCOPICThe kind of light which turns on in rhythm with the occurrence of somethinghappening and off after it has happened. So the event is seen only at a specifictime or in a specific place. In the case of TIMING an engine, to get the fixed timingmark and the moving mark to meet, the STROBOSCOPIC TIMING LIGHT isarranged to switch on as the moving mark is near or opposite to the fixed mark.This has the effect of making the moving mark to appear stationary and it allowsthe adjustment to be made accurately.

TACHOMETERA circuit in a multimeter which indicates engine speed as a result of countingpulses of current electricity passing through the ignition system.

TDC - (Top Dead Centre)The highest point of the travel of a piston in a cylinder. BTDC (before TDC) - A way of describing the correct timing of the spark in a cylinder.

THERMISTORAn electronic device reacting to temperature

TRANSDUCERA sensor which responds to temperature or pressure

TRANSISTORA form of electronic switch

VOLTThe unit of electrical energy (potential difference). The voltage is proportional tothe current and limited by the resistance contained in the circuit (see OHM'S LAWabove). The difference in voltage between the ends of a circuit, is what causeselectricity to move through it. (See next - GLOSSARY EXTRA)

41

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INDEX

42

CODE Page No

77001 15

77002 21

77003 21/24

77004 6

77005 22

77006 29

77007 30

77008 35/36

77010 15

77011 8

77013 18

77015 14

77016 14

77017 14

77018 14

77019 8

77020 8

77021 20

77022 28

77023 16

77026 11

77027 11

77028 10

77029 17

G4008 27

G4053 33

G4055A 23

G4055B 23

G4055C 23

G4055D 23

G4055E 23

G4058 19

G4062 19

G4062/18 19

G4062 19

G4063 19

G4074 31

G4079 34

G4086 25

G4094 26

G4095 26

CODE Page No

G4101 23

G4103 25

G4104B 12

G4106 12

G4107 14

G4108 12

G4113 36

G4123 36

G4125 10

G4126B 12

G4126BL 12

G4128 9

G4133 36

G4137 12

G4138 12

G4140 12

G4142 7

G4143 7

G4148 17

G4152 5

G4153 6

G4154 6

G4155 5

G4156 5

G4157 6

G4158 5

G4159 6

G4160 5

G4162 5

G4164 5

G4165 5

G4166 16

G4169 7

G4170 32

G4171 32

G4172 32

G4184 14

G4187 7

G4189 17

G4195 7

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