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A Systems Approach

PowerPoint® PresentationPrepared byRené Green

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Chapter 5

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Chapter Overview This chapter covers the most common diagnostic tools

used on yesterday's and today's vehicles. Technicians need to know how to conduct tests with the latest testers, as well as be able to conduct tests with the most basic of testers.

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Chapter Objectives Explain the basic principles of electricity. Diagnose electrical problems by logic and

symptom description. Perform troubleshooting procedures using

meters, test lights, and jumper wires. Explain the proper use of a logic probe. Describe what is displayed on an oscilloscope.

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Explain the proper use of a Digital Storage Oscilloscope.

Explain basic infrared analyzer operation. Describe the major test capabilities of an engine

analyzer. Name the diagnostic tools and equipment

commonly used in vehicle repair work. Describe the basic applications and operation of

these tools.

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Atom• Nucleus

– Protons– Neutrons– Electrons

Electrical Fundamentals Flow of Electricity

Energy sources Chemical Magnetic

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Electrical Flow (Current)

Resistance Electrical

Pressure Ohm's Law Power Circuits

Measuring Electricity

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Open

Basic Electrical Diagnosis

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Short

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High resistance

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Electrical Test Equipment

Circuit TesterTest lightContinuity tester

Voltmeter

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Ammeter

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Ohmmeter

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Logic Probes

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DMM Usage Multimeter

DVOMDMMRMSAverage RespondingRFI

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Duty Cycle Pulse width Frequency

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Ignition System Test Equipment Tachometer Tach-

Dwellmeter Timing Light

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BTDCATDC

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Magnetic Timing Probe

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Electronic Ignition TesterShorted module testCranking current testKey on/engine off current testIdle current testCruise current testCranking primary voltage testIdle primary voltage testCruise primary voltage test

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Lab Scopes Dual-trace

oscilloscopes Glitches

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Analog Digital

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Wave forms

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Engine Diagnostic Tools Compression testers Cylinder Leakage Tester Cylinder Power Balance Test Vacuum Gauge Vacuum Pump Vacuum Leak Detector

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Cooling System Pressure Tester Coolant Hydrometer Oil Pressure Gauge Belt Tension Gauge Stethoscope

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Fuel System Test Equipment Pressure Gauge Injector Balance Tester Injector Circuit Test Light Fuel Injector Cleaners

Exhaust Analyzers Two Gas Four Gas Five Gas

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Scanners Breakout boxes ODB-II

Engine Analyzers All in one

Compression gaugeEmission analyzerPressure analyzer

Scan Tools

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VoltmeterVacuum gaugeOhmmeterVacuum pumpAmmeterTachometerOscilloscopeTiming light/probeComputer scan tool

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Tests Performed by Engine AnalyzersCranking voltageRelative compressionCharging voltagePrimary circuit voltageSecondary circuit kilovoltageCylinder power balanceEngine vacuum

Hydraulic System Testers Pressure Gauges