Volume 19 Issue 6 Techconnect News 2012

7/24/2019 Volume 19 Issue 6 Techconnect News 2012

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in the tank. CNG quantity is affected changes in fuel temperature and fuelpressure.

The single light at the top of theswitch indicates which fuel system(mode) is currently in operation. Redindicates gasoline mode and greenindicates CNG mode. When the sy

tem is changing from gasoline toCNG, the indicator will turn orangefor a few seconds.

Four lights are at the bottom of switch. The number of illuminatedlights indicates the CNG fuel level.

November & December 2012

Scan the code to download a PDF ofthe current issue

www.acdelcotechconnect.com, clickthe TechConnect Magazine link

IN THIS ISSUE

New Bi-Fuel Gasoline and

CNG Pickup Trucks . . . . . . . . . . . . . . . . . . . .

ACDelco Featured on Two Guys Garage . .

Complete Timing Chain

Replacement Kits Available . . . . . . . . . . . . .

Counterfeit Airbag Modules . . . . . . . . . . . . .

Wide Range Air/Fuel Sensors . . . . . . . . . . .

Updating Your ACDelco.com

Landing P age . . . . . . . . . . . . . . . . . . . . . . . . . .

2013 MACS Training Event . . . . . . . . . . . . . .

Tech Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Training Update . . . . . . . . . . . . . . . . . . . . . . .

TechConnect Reader Survey Ends Soon . .

GO

TO THEe-EDITION

The flexibility of choosing a differentfuel altogether may be the best choicein the ongoing battle with unpredictablefuel prices. In the new 2013 ChevroletSilverado and GMC Sierra 2500 HDbi-fuel pickup trucks, gas is gas whether its gasoline or CompressedNatural Gas (CNG) and either fuelcan be used with the push of a but-ton. The 6.0L V8 engine can run ongasoline or CNG and seamlesslytransitions between the two fuelswithout any loss of performance orfuel economy. The CNG and gasolinetanks have a combined range of 650miles.

The bi-fuel system is designed forprimary operation on CNG as long asthere is sufficient fuel in the CNG fueltank. The trucks feature a 17.5 GGE,gasoline gallon equivalent, (66.2 L)CNG tank and a 36 gallon (136.2 L)

gasoline tank.Bi-Fuel Engine

The 6.0L V8 engine uses an EngineControl Module (ECM) with both gaso-line and CNG calibrations to ensure allengine operating parameters are withinacceptable performance operatinglimits. The engine is designed to meetstrict Environmental Protection Agency(EPA) and California Air ResourcesBoard (CARB) certification. It featuresa gasoline fuel injection system and aCNG fuel injection system.

The hardened bi-fuel engine providesthe same durability as a gasoline onlyengine. The hardened engine compo-nents for CNG fuel use include hard-ened intake and exhaust valve seatsand hardened exhaust valves.

The engine always starts on gasoline.When the engine reaches a pre-deter-mined operating temperature it seam-lessly switches over to the CNG fuelsystem. If the CNG fuel is depleted, the

New Bi-Fuel Gasoline andCNG Pickup Trucks

system automatically switches over tothe gasoline system.

A minimum gasoline level of at leastone-quarter tank should always be main-tained. To protect engine components,a switch to gasoline may occur at anytime. The vehicle will not start if theengine stalls due to a lack of gasoline.

Switching Between Fuels

The CNG fuel mode switch and LEDfuel gauge is located on the center ofthe instrument panel. The CNG fuelgauge indicates how much CNG is left

continued on pa

New Bi-Fuel Gasoline andCNG Pickup Trucks
http://www.acdelcotechconnect.com/http://www.acdelcotechconnect.com/http://www.acdelcotechconnect.com/http://sandyblogs.com/techconnect/http://sandyblogs.com/techconnect/http://sandyblogs.com/techconnect/http://sandyblogs.com/techconnect/http://www.acdelcotechconnect.com/


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2

Volume 19, Number 6 (TS-PU-0010-12)

ACDelco TechConnect is published bi-monthlyand online for technicians of ProfessionalService Center and Key Fleet accounts toprovide timely service information, increaseknowledge and improve the performance of theservice center.

ACDelco 360 represents our mission to lookat our businesses at every possible angle toprovide value and assistance to our distributorsand their customers as well as offer a full circleof support with programs, tools, training andmarketing focused on enhancing and growingour partnership successfully.

Publisher:Rick Balabon

ACDelcoE-mail/

[email protected]

Editor:Greg St. Aubin

ACDelcoE-mail/

[email protected]

Technical Editor:

Mark SpencerE-mail/

[email protected]

Production Manager:

Marie Meredith

Desktop Publishing:

5by5 Design LLCE-mail/

[email protected]

Write to:* ACDelco TechConnect P.O. Box 500 Troy, MI 48007-0500

On the Web::

To read and search recent issues ofTechConnectonline:

www.acdelcotechconnect.com,click the TechConnectMagazinelink, or

Log in to the ACDelco LMS, clickthe Resources link

ACDelco service tips are intended for use by professionaltechnicians, not a do-it-yourselfer. They are written toinform those technicians of conditions that may occur on

some vehicles, or to provide information that could assistin the proper service of a vehicle. Properly trained techni-cians have the equipment, tools, safety instructions andknow-how to do a job properly and safely. If a conditionis described, it cannot be assumed that the informationapplies to all vehicles or that all vehicles will have thatcondition.

All materials and programs described in this magazineare subject to change. Submission of materials impliesthe right to edit and publish. Inclusion in the publicationis not necessarily an endorsement of the individual orthe company.

TechConnectis published for ACDelco by SandyCorporation, Troy, MI.

2012 ACDelco. All rights reserved.

New Bi-Fuel Pickup Trucks continued from page 1

Four lights indicate a full tank (approxi-mately 3,6003,100 psi; 24,80021,400kPa) while only one light indicates thefuel level is less than a quarter tank full(approximately 1,000500 psi; 6,9003,450 kPa).

The driver can press the center of theswitch to change fuels at almost anytime. The fuel mode can be changedalmost any time the ignition is ON, orthe engine is running.

CNG Fuel Supply

The CNG fuel supply and meter-ing system consists of the followingcomponents:

CNG 1/4 turn isolation valve(manual shut-off valve)

Alternative fuel rail pressure/temperature sensor

CNG coalescing fuel lter CNG cut-off solenoid valves

(2 solenoid valves)

Engine Control Module (ECM)

Excess ow valve

Fill line check valve

Fill lter

Fill valve (NGV1 ll receptacle)

Fuel injectors/injector hoses

Fuel Injector Control Module(FICM)

Fuel injector rails

Fuel mode switch

CNG fuel pressure regulator

Fuel pump disable module

CNG fuel tank

CNG Fuel Tank Pressure (FTP)sensor

CNG fuel tank temperature sensor

CNG tank Pressure Relief Device(PRD) (2 devices)

High pressure line and hose(stainless steel tubing and stainlesssteel jacketed PTFE hose)

LED fuel gauge

Low pressure fuel line and hose(stainless steel tubing and stainlesssteel jacketed PTFE hose)

The high pressure fuel system isequipped with a manually operated1/4 turn isolation valve (manual shut-off valve), located in the high pressuresupply line near the CNG fuel tank out-let on the drivers side of the vehicle.The purpose of the valve is to isolatethe high pressure side of the fuel sys-tem for some service procedures. If this

valve is inadvertently left in the OFFposition, the vehicle will not operate inCNG mode. Turn the manual shut-offvalve 90 degrees to turn OFF the CNG.

The coalescing fuel filter is locatedbetween the front CNG cut-off solenoidvalve 1 and the 1/4 turn isolation valve(manual shut-off valve). It contains a 6micron filter element and a drain fitting.The filter is designed to trap contami-nates and liquids that may damage thefuel injectors. It must be periodicallyinspected, drained and replaced.

CNG OperationThe FICM controls the three operat-

ing modes of the bi-fuel system. Ingasoline mode, the fuel injector andfuel pump control signals are bypassedthrough the FICM to the proper compo-nents, allowing the vehicle to operatethe same as a conventional vehicle.

In change-over mode, the FICMsupplies voltage to the CNG cut-offsolenoid valves, opening them at theCNG fuel tank and the pressure regu-lator, which allows the CNG systempressure to adjust to the normal oper-

ating pressure from the tank to theinjectors. The FICM will then switchoff the gasoline injectors sequentiallybeginning with cylinder #1. The appro-priate CNG injectors are switched onsequentially as each gasoline injector isswitched off.

Once the engine is operating inCNG mode, the gasoline fuel pump isswitched off by the FICM. The ECMperforms all injector pulse and ignition

Fuel mode and CNG level indicator

continued on page 3
mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]


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New Bi-Fuel Pickup Trucks continued from page 2

3

Complete Timing ChainReplacement Kits Available

ACDelco has introduced complete,

Original Equipment Service timing chainreplacement kits for 2007-2012 GMhigh-feature V6 engines. The kits, whichinclude all the components needed toreplace the timing chain, incorporate allof the latest product updates, designupgrades and any service bulletin con-cerns issued since the original engineswent into service.

Kits include the primary and second-ary timing chains, bolts, seals and sealkits, tensioners and gaskets. All partsin the kits are 100-percent new, andare backed by a 12-month, 12,000-mile

warranty.

The part numbers and applications are:

For more information about ACDelctiming chain replacement kits, contacyour local ACDelco representative.

Thanks to Rick Balabon

ACDelco KitNumber

Application

12650230 2007 models(RPO LY7, LP1)

12650231 2008-2012 models(RPO LY7)2010-2012 models(RPO LAU)

12651450 2008+ modelsRPO LLT)2010+ models(RPO LF1, LFW, LFX)

timing calculations to ensure properengine performance.

The Tech 2/MDI scan tools are usedfor vehicle diagnosis. Diagnostic TroubleCodes (DTCs) are the same as withgasoline only engines.

There are two cut-off solenoid valves.When they are not energized, thesesolenoids close an internal valve to block

the flow of CNG. The front CNG cut-offsolenoid valve 1 is integrated with theCNG fuel pressure regulator assembly.The rear high pressure CNG cut-offsolenoid valve 2 is located near the CNGfuel tank outlet.

A 40 micron filter is integrated with

the fill valve to help prevent contami-nates from entering the CNG fuel sys-tem during refueling. When the filterbecomes restricted, the amount oftime required to refill the CNG tank willincrease.

The CNG fill valve (receptacle) is aNGV1 profile and mates to any NGV1 filldispenser valve. The fill dispenser sealsto the receptacle with an internal O-ring.The fill valve is mounted in the side ofthe CNG fuel tank cover. Remove andreinstall the fill valve dust cover whenrefueling.

The CNG fuel tank, located at thefront of the truck bed, is constructed aluminum liner wrapped in carbon fibeand conforms to NGV2-2000 (Type 3)specifications. The CNG cut-off solenovalve 2 is threaded into the outlet end(driver side) of the fuel tank and is useto prevent fuel flow during non-opera-

tional running conditions. The service of a Type 3 CNG fuel tank is 15 yearsfrom the date it was manufactured.Metal shields are used to protect thetank from road debris or other contactconditions that may occur.

All service parts, including the gasefuel components, are available througthe GM parts distribution system.

Thanks to Sherman Dixon andChris Graham

ACDelco Featured on Two Guys GarageACDelco, in association with

Federated Auto Parts, was recentlyfeatured on Two Guys Garage, thevehicle repair, customizing and restora-tion show hosted by Kevin Byrd andWillie B. on the SPEED channel.

The episode, Time for a Change

(#1115), has aired several times recent-ly. It also can be viewed any time onhttp://twoguysgarage.com. Click theEpisodes link to search for the show.

On this episode, a 2003 Cadillac CTS

with 117,000 miles is inspected andrepaired before it is transferred to a

college-bound daughter. A completeroster of maintenance and repair components are used on the car, alongwith a few ACDelco tools, includingour latest inspection camera. Producthighlights include ACDelco ProfessioDuraStop brake components and anACDelco Professional Silver battery.

Be sure to check out this greatepisode and share it with your ACDecustomers.

Thanks to Curt Collins

CNG manual shut off valve. The valve isshown in the ON position.
http://twoguysgarage.com/http://twoguysgarage.com/http://twoguysgarage.com/http://twoguysgarage.com/


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4

Counterfeit Airbag ModulesThe National Highway Traffic Safety

Administration (NHTSA) recently issueda consumer safety advisory to announcethat counterfeit airbags have enteredthe U. S. from China. Counterfeit airbagsmay not deploy or perform in the samemanner as GM-supplied replacementairbags. GM strongly recommends that

suspected airbags be replaced.

A unique GM customer assistancephone number has been established toanswer owner questions. Concernedcustomers in the U.S. may call1-866-237-3601.

GM service bulletin #12-09-41-001Acan help in the identification of counter-feit airbag modules for the GM vehiclesidentified by NHTSA that may be affect-ed, which include the 2010-2011 BuickLaCrosse, 2006-2010 Chevrolet Aveo,and 2011-2012 Chevrolet Camaro, Cruze

and Volt.

Vehicles purchased new that havenever had the airbags replaced are notat risk. Vehicles purchased new thathave had the air bags replaced withgenuine GM airbags at an authorizeddealer (new car sales) also are not atrisk. For all other scenarios, a physicalinspection may be the best way to iden-tify whether the airbag module installedis the proper Original EquipmentManufacturer (OEM) airbag.

Based on the information provided to

GM, the counterfeit airbag modules arebeing manufactured from a collection ofreclaimed components with some newor remanufactured parts. Due to thispiecing together of available parts,there may be a wide variety of appear-ance and functional differences betweeneach individual counterfeit module.

Inspection

When inspecting an airbag module,its necessary to remove the module toevaluate whether it is an authentic GMpart. The following are immediate signsof a possible counterfeit module:

The airbag light should illuminateduring key on and turn off afterthe vehicle is started. A glowingairbag light indicates a functionalproblem with the airbag module.The lack of an airbag light duringkey on may indicate the bulbhas been disabled to prevent thecustomer from being alerted to aproblem with the module.

The vehicle horn should function.A lack of a horn may indicate the

air bag module horn contacts areincorrectly placed, or missing fromthe module.

The emblem on the airbag covermay not match the size, shape,texture or color of a known genuineGM airbag module.

The letters of the word airbag,which are embossed or moldedinto the vinyl trim cover may not bewell-defined.

The texture of the vinyl materialused for the counterfeit air bag trimcover varies from the OEM material.

There may be evidence that thecounterfeit airbag installer shavedor trimmed the vinyl trim cover forbetter fit into the steering wheelhousing.

The inator assembly is labeledwith a different OEM name than theairbags emblem or intended vehiclebrand.

Identifying Counterfeits

Once the airbag module is removed,there may be several clues that iden-tify a counterfeit airbag module. Thesevisual indications may be more usefulas opposed to confirming part num-bers or molded-in identifiers since thecounterfeiter may have reproduced acorrect part number or have correctmolding marks because some portion

of the module may be a reclaimed OEMcomponent.

The following airbag module photois a confirmed counterfeit part. Pleasenote the following:

The caution label applied to the backof the module is the incorrect sizeand shape for the module. In orderto place it in the intended locationthe label had to be folded over (A)in two places. Additionally, cautionlabels, will not be tucked under thebacking plate (B) as shown.

The electrical connectors (C) on theback of the airbag module will becolor coded and match the connec-tor color on the vehicle side. Theseconnectors are keyed for each vehi-cle application and should not showany signs of being re-machined ortampered with.

Examine the module for tool marksvisible on the fasteners and/or grind-er marks visible on the air bag back-ing plate. A counterfeit air bag mayhave numerous holes (D) drilled/cut

into it, which allows the counterfeitair bag to be installed into a widerrange of vehicles.

Missing Shorting Bars

The airbag modules also should beequipped with shorting bars incor-porated in the electrical connectors.Grounding terminals, or shorting bars,on the inflator wire connectors, whichprevent the air bag from deploying whendisconnected from the vehicle system,

that are missing is a sign of a counterfeitairbag. The shorting bars appear as agold plated U-shaped piece of metal.

For additional information aboutinspecting for counterfeit airbagmodules, including specific details foridentified GM vehicles, refer to servicebulletin #12-09-41-001A.

If your customers would like moreinformation about this counterfeit air-bag modules issue, refer them towww.safercar.gov.


A. Folded-over labelB. Label tucked behind backing plateC. Electrical connectors should

match vehicle connectorsD. Additional holes

Shorting bars on a genuine GM airbagmodule.


5/8

Wide Range Air/Fuel SensorsSince wideband oxygen (O2) sensors, or Wide Range Air/

Fuel (WRAF) sensors, were introduced in the late-1990s, theyhave become critical parts of the modern engine manage-ment system that is required to meet ever lower emissiontargets and higher fuel economy goals all without compro-mising engine performance.

WRAF

sensorscan gaugehow muchoxygen is inthe exhauststream,whichenablesthe EngineControlModule(ECM) to precisely gauge combustion mixtures and effectivelymanage the combustion process.

For a review of conventional heated oxygen (O2) sensors,

refer to the May-June issue of TechConnect.

Enhanced Accuracy

WRAF sensors are different from conventional switchingoxygen sensors. WRAF sensors incorporate both an oxygen-pumping cell and the more familiar conventional switchingoxygen-sensing cell. WRAF sensors are a planar type (the flatplane shape of the sensing element) and consist of an oxygensensing cell, an oxygen pumping cell and a heating element.The wiring harness of a WRAF sensor typically has five orsix wires.

As with all oxygen sensors, the WRAF sensor measuresthe amount of oxygen in the exhaust system but measuresa wider range more quickly and more accurately. This allowsthe fuel control system to stay closed-loop during moreconditions than a conventional switching-style oxygen sensor,including:

High power and engine protection modes whereenrichment is necessary

During light-off or after-start modes, reducing coldstart emissions

Depending on the application, the fuel control systemstatus will still go into open-loop during some operatingconditions (e.g., deceleration, faulted states).

Sensor Design

The WRAF sensor heater is pulse-width-modulated andis used to keep the sensor around 800C, with an operat-ing range of 600C to 950C. Temperatures over 950C candamage the sensor.

A trim resistor is incorporated into the WRAF sensorconnector to calibrate the sensor during assembly. The trimresistor is either laser-etched or added into the connector atthe end of the manufacturers assembly line to change itsresistance and output current. The overall effect shifts thesensor output response to the appropriate level specified forthe application.

During engine operation, the exhaust gas travels throughthe diffusion barrier into the diffusion gap between the

sensing cell and the pumping cell. The ECM will keep thediffusion gap mixture at lambda value of 1 (14.7:1 air-fuelratio) by pumping oxygen ions into or out of this gap using pumping cell.

The ECM determines how much pumping current isneeded by monitoring the oxygen sensor sensing cell valueA lambda value of 1 corresponds to a conventional sensor

reading of 450mV. Therefore, the required pumping currenis an indicator of how rich or lean the exhaust gas is at anyparticular time.

Compared to a conventional switching sensor, using aWRAF sensor informs the ECM of exactly how rich or leanthe air-fuel ratio is. A conventional switching oxygen sensowill only indicate if the air-fuel ratio is lean or rich.

Scan Tool Parameters

The scan tool parameters associated with the WRAFsensor is different than the parameters associated with aconventional sensor. For a WRAF oxygen sensor, the scantool displaysO2 sensorreadingsin lambda.Lambdaequals theactual air-fuelratio dividedby the stoi-chiometricair-fuel ratio.

A lambdavalue greaterthan 1.0 indi-cates a leanconditionand a lambdavalue less than 1.0 indicates a rich condition.

If the ECM detects an excessively lean or rich condition,the ECM will set a fuel trim Diagnostic Trouble Code (DTC


Wide Range Air/Fuel (WRAF) sensor

Lean condition (one sensor type shown, others are similar)

The scan tool lambda value indicates alean or rich condition.

5


6/8

The 2013 Mobile Air ConditioningSociety (MACS) Training Event and TradeShow will take place February 7-9, 2013 atthe Caribe Royale Resort in Orlando, Fla.

ACDelco is sponsoring the Mobile A/CBoot Camp training classes. The bootcamp will offer a variety of HVAC train-ing covering the skills, procedures andtechniques that can have a direct impacton shop revenue.

Additional training clinics that arescheduled include:

R-124yf Design & Service NewCompressors

Hybrid & EV Thermal ManagementSystems

Become an Expert with Your ScanTool

Exceptional Customer HandlingSkills

HD/Off-Road Technical Training

Engine Cooling Technical Training

HVAC Systems: Refrigeration & AirDistribution

Diagnosing Todays Climate ControlSystems

Working with Generations X & Y

MVAC Systems: Electrical/ElectronicOperation

Section 609 Certication Class

For more information, go to theMACS website at www.macsw.org.


6

Whencustomers use the locatorfeature on ACDelco.comtofind yourservice center, are they getting all theright information? That depends on

the service centers contact informationbeing up-to-date.

To use the locator:

1. VisitACDelco.com.

2. Enter the zip code in the Find aService Center search box.

3. Click GO.

The results will return the PSCservice centers near the entered zipcode. Place the cursor over a businesslocation on the map and click MoreInformation to view all the details about

the service center, including contactinformation, business address, hours ofoperation and much more.

If the information is not up-to-date ordoesnt include all the information aboutwhat the service center offers, its easyto change.

Landing Page Information

The following information can beupdated by the service center:

In business since

Phone

Fax

Business email

Public email

Business website

URL (will onlyappear on Blueaccounts)

Facebook/Twitter/YouTube/Foursquare/othersocial network

Retail parts pro-vider

Offer Knowledgeis Power semi-nars

Hours of opera-tion

Purchasing infor-mation and services

Default shop image

Up to ve additional shop images

Up to ve logo images

Awards and accolades

Shop stories (Shop history; up to19 service stories or technicianbiographies)

The updated information will enhanceyour service centers perception with

customers as well as the servicelocator search capability.

To change any information not listedabove or if your business is not set upin the system, contact your ACDelcorepresentative who can provide a loginID/password along with instructions onhow to update the landing page for theservice center.

For additional information, refer toACDelco bulletin #12D-089.

Thanks to Jill Brown

Updating Your ACDelco.com Landing Page

Professional Service Center

2013 MACS Training Event
http://www.acdelco.com/http://www.acdelco.com/http://www.acdelco.com/http://www.acdelco.com/http://www.acdelco.com/http://www.acdelco.com/http://www.acdelco.com/http://www.acdelco.com/http://www.acdelco.com/


7/8

Timing Belt Installation

2001-2005 Honda Civic equipped with

the 1.7L 4-cylinder engine

Incorrect tensioner position andimproper belt tension can result ina violent correction of the tensionerposition and damage to the tensioner,spring and belt. Improper belt trackingalso can cause interference with othercomponents.

Improper belt setup turning thecrankshaft clockwise during initial setup can damage the tensioner spring.The spring must be in the up position,noted on the spring rubber dampener.

During setup, the crankshaft mustbe rotated two turns counterclockwisewith the locking pin in the tensionerand the attachment bolt loose.

In addition, for 2001-2003 models, alonger fastening bolt may be required.Honda upgraded the timing belt ten-sioner assembly in late 2002. The boltlength was increased to 54mm to allowfor proper thread engagement. The

ACDelco kit follows the design changeand includes the updated bolt.

Winter Tires

Many late model GM high perfor-mance vehicles are factory equippedwith tires that are optimized formaximum dry and wet road perfor-mance while still retaining satisfac-tory tread life, durability and low noiselevels. In severe winter climates wheresnowfall may be significant, these tiresmay be found to provide less traction.Winter tires may enhance winter drivingin these conditions.

GM performance-oriented vehicles

that are rear-wheel drive take advantageof the natural weight shift rearwardduring acceleration, increasing dry roadtraction on the driven wheels. Rear-wheel drive also contributes to neutralsteering as it takes the burden off thefront wheels to both power and turnthe vehicle. The connection betweenthe steering and the powertrain is alsoeliminated, removing any tendencyfor engine power to influence thesteering under heavy acceleration orrough roads.

Generally, front-wheel drive vehiclesoffer additional winter traction dueto the weight of the engine/transaxlesitting directly above the driving wheels,and are found to be satisfactory forwinter driving when factory equippedwith all-season tires.

On all vehicles, if a decision is madeto switch to winter tires, all four tiresmust be replaced. When selectingwinter tires, keep the same size andaspect ratio as the original equipmenttires unless otherwise directed by themanufacturer. Deviating from the origi-

nal size may create clearance issues,speedometer error and/or alter thehandling characteristics of the vehicle.

If winter tires are not available in thesame speed rating as the original equip-ment tires, do not exceed the speedrating of the winter tire chosen.

Winter tires, in general, are optimizedfor increased traction on snow andice. In some instances, this may trans-late into decreased dry road traction,increased road noise and shorter tread

life. Recommend to customers to dricautiously after switching tires and to

get acclimated to the new handling abraking performance characteristics.

Corrosion Protection ofMetal Panels

When an aftermarket accessory isinstalled on a vehicle, where drillingholes into metal body panels or sup-ports on the vehicle is required, itscritical to maintain proper corrosionprotection. Any time a metal surface disturbed, such as by drilling a hole foa fastener, the corrosion resistance othat panel is compromised.

One of the best ways to protectthe fastener-to-panel mounting holesfrom future corrosion is to use GMVehicle Care Super Lubewith PTFE(Polytetrafluoroethylene). This is theonly product recommended by GM fothe corrosion protectionof metal panels wherefasteners will be addedto metal panels.

When installing acces-sories, apply SuperLube to any hole and

fastener before install-ing the fastener into thedrilled attaching hole orinside the metal panel.

7

Product InformationFor free technical assistance and

product information regarding specifiACDelco products, contact these tofree information hotlines staffed byASE-certified technicians:

Brakes 1-888-701-6169 (prompt #1)

Chassis 1-888-701-6169 (prompt #2

Clutches 1-888-725-8625

Lift Supports 1-800-790-5438

Shocks 1-877-466-7752

Starters and Alternators 1-800-228-9672

Steering (Pumps, Rack and Pinion,Gears) 1-866-833-5567

Wiper Blades 1-800-810-7096

The following technical tips provide repair information about specific conditions on a variety of vehicles. If you have a tough or unusualservice repair, the Diagnostic Hotlinecan help. Call 1-800-825-5886, prompt #2, from 8 a.m. to 8 p.m. ET MondayFriday, tospeak with a technical expert with the latest OEM information.

TechTips

Rotate the crankshaft two turnscounterclockwise.

Old bolt: 50.6mmNew bolt: 54mm


8/8

TS-PU-0010-12 8

TrainingUpdate

How to Take ACDelco Training

Go to www.acdelcotechconnect.comand click the Training tab to log in to theACDelco Learning Management System(LMS).

To enroll in courses in your trainingpath, open the home page to view yourTraining Progress Status Report, selectClick Here to Show Detail, and then clickthe course number and title to viewdetails on a specific course and to launchor enroll in the course.

To enroll in an Instructor-Led Training(ILT)course (ILTs are full-day hands-onclassroom courses), click Take Training >Instructor-Led Training to view the cata-log and select a specific course.

To enroll in a Virtual ClassroomTraining (VCT)course (VCTs are 1-2

hour live online courses), click TakeTraining > Virtual Classroon Training toview the catalog and select a specificcourse.

To launch a Web-Based Training (WBT)course (WBTs are 1-4 hour self-guidedonline courses), click Take Training >Web-Based Training to view the catalogand select a specific course.

To launch aTechAssist (TAS)course(TAS courses are 15-20 minute onlinepresentations on a specific topic), clickTake Training > TechAssist to view thecatalog and select a specific course.

To launch a Simulation (SIM) (SIMsrequire users to complete all repairsfor a condition), click Take Training >Simulations to view the catalog andselect a diagnostic challenge simulation.

Training Schedule

To search for currently scheduled coursesin your area, view the Training in Your Areasection on the Home page. Select searchterms from the dropdown menus and clickthe Submit button.

Thanks to Greg St. Aubin

Course Number Course Name

S-AC07-03.01ILT HVAC Control System Operation and Diagnostics

S-BK05-01.01ILT Braking Systems

S-BK05-02.01ILT ABS Operation and Diagnosis

S-EL06-04.02ILT Network Communication Diagnosis

S-EL06-10.02ILT Electrical Power Management

S-EL06-11.02ILT Enhanced Automotive Circuit Diagnosis

S-EL06-12.01ILT Hybrid Technology and Service

S-EL06-13.01ILT Body Electrical Global Diagnostics

S-EL06-14.01ILT Advanced Body Control System Electrical Diagnostics

S-EP08-02.01ILT Engine Performance Computer Controls and Ignition System Diagnostics

S-EP08-03.01ILT Engine Performance Air Induction and Fuel System Diagnostics

S-EP08-04.01ILT Engine Performance Fault Monitoring and Emission System Diagnostics

S-EP08-05.01ILT Engine Performance Advanced Drivability Diagnostics

S-EP08-06.01ILT After Combustion Sensors

S-EP08-08.01ILT Evaporative Emissions Controls

S-EP08-09.01ILT Spark Generation

S-EP08-81.01ILT Duramax 6600 Diesel Engine Performance

S-EP08-81.02ILT Duramax Diesel Operation and Diagnosis

S-SS04-01.01ILT Vibration Correction Diagnostics

S-ST10-01.01ILT Supplemental Restraint Systems

Course Number Course Name

S-AC07-02.01VCT HVAC System Operation and Service Hints

S-AC-07-03.01VCT HVAC System Flushing, Recovery and Diagnostics

S-EL06-03.01VCT Serial Data Communication Networks

S-EL06-04.01VCT Communication Network Diagnosis

S-EL06-06.01VCT Two-Mode Hybrid System Safety and Special Tools

S-EL06-07.01VCT Two-Mode Hybrid System Diagnosis and Repair

S-EM01-02.01VCT Active Fuel Management Operation

S-EM01-03.01VCT Active Fuel Management Diagnosis

S-EP08-01.01VCT 6.6L Duramax Engine Diagnosis

S-EP08-02.01VCT 6.6L Duramax LMM Diesel Engine

S-EP08-03.01VCT 6.6L Duramax LGH and LML Diesel Engines

Current Instructor-Led Training Courses

The following ILT courses are currently being scheduled:

Current Virtual Classroom Training Courses

The following VCT courses are currently being scheduled:

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Documents

Volume 19 Issue 6 Techconnect News 2012