Dual-Stage Air Bag Debuts Dual
Contents
1. For the 2001 model year a supple mental inflatable restraint SIR system featuring dual stage air bags is installed in the Oldsmobile Aurora Buick LeSabre Pontiac Bonneville and Chevrolet Impala and Monte Carlo The dual stage system was designed to help tailor air bag deploy ment to the severity of the collision To help understand how the dual stage system works let s review oper ation of the model year 2000 single stage system The air bag inflator module mount ed in the steering wheel or in the instrument panel consists of a canister of stored gas an ini tiator to heat the stored gas to expand its volume and a fab ric bag In a collision the initia tor is electrically energized This sets off a chemical reac tion which heats the gas and allows the gas to inflate the bag Once the bag is inflated it quickly deflates through vent holes and or the weave of the fabric An electronic device called the Sensing and Diagnostic Module SDM located within the vehi cle is wired in series with the initiator When the SDM detects the conditions indicating that a collision is occurring it completes the circuit to the Initiator Dual Stage System The dual stage air bag system adds several enhancements to this basic operation The dual stage inflator mod ule contains a canister of stored gas but has two separate initiators each controlled individually by the SDM This means that there are two connec2. description and operation of this vehicle s Keyless Entry system to insure that you are testing the system operation correct ly Next it will ask you to verify that the customer is using the correct fob for this vehi cle cite r ETAP a In multiple vehicle families your Cus tomer may have a fob that looks correct for the vehicle but is different internally and may not work The wrong fob will pass on the J 43241 Keyless Entry Tester but O41 Grand Pri 01 Intrigue T1 Regal 01 Pont Aztek B will not synchronize or program to the vehicle If you are using the correct fob for this vehi cle the diagnostic then instructs you to test the fob using the J 43241 Keyless Entry Tester to find a dead or weak bat tery sticking or inopera tive buttons or a dead transmitter due to inter nal electronic failure The next step will instruct you to try to synchronize the fob to the vehicle by pressing and hold ing both the Lock F and Unlock but oe tons for seven mee seconds If syn chronization is unsuccessful the next step is to try to reprogram the fob to the vehicle If the Keyless Entry system still has a problem you have either a bad module or a wiring problem Use the diagnostic proce dures as written to help you quickly isolate and repair the condition A quick reference table Sample shown will be Included In every ser vice manual that allows you to associate
3. the physical appearance of a fob with a part number the specific vehicle appli cations and RPO num bers Kemel Kulick Return to page 1 Trunk Release Handles Now Inside All Trunks Beginning with the 2001 model year all GM passenger cars will now feature new interior trunk release handles as Standard equipment In addition to the new han dles trap resistant trunk kits are available for previous mod els And upcoming on several 2001 models the trunk release TrapAlert system will be available The two systems are designed to help prevent a child from becoming trapped in the trunk Some type of interior trunk release to help prevent trunk entrapment will become a Federal requirement for all motor vehicles begin ning in January 2001 tion Trunk Release Handle The new trunk release handle inside the trunk Is located on the trunk latch and is easily identified The handle will glow in the dark following exposure to a light source making it easier to locate inside the trunk By simply pulling the release handle the trunk will open from the inside It should be pointed out to customers that the trunk release handle is not designed to be used to tie down the trunk lid or as an anchor point New Film Protects Vehicles during Transit The paint finishes of the Chevrolet Monte Carlo Camaro and Corvette and the Pontiac Firebird now have additional pro
4. tors on the module and two sets of wires between the inflator module and ye WAMI eee jy Dual stage airbag is identified by having two electrical connections the SDM For moderate frontal colli sions the stage 1 Initiator is ener gized For more severe frontal colli sions both stage 1 and 2 initiators are energized together continued on page 2 i FE ne el ee Service Operations continued from page 1 Deployment Harness J 38826 75 The SDM also is different In addi tion to its internal sensor circuitry the dual stage SDM is connected to an additional electronic frontal sensor EFS mounted in the area of the grille of the vehicle The EFS helps judge the severity of the collision and helps the SDM decide whether to ignite just one stage of the inflator module or two Here s an important fact When the inflator module is activated all of the stored gas is released If only the first Stage Initiator is energized the propel lant is heated less and provides a smaller volume of gas to the bag If both the first and second stage initia Connectors of the Deployment Harness J 38826 75 are color keyed tors are energized together the stored gas is heated more and provides a larger volume of gas to the bag The whole inflation event takes place in mere milliseconds Deployed Air Bag Service If you are called on to service a vehicle in which a dual stage air bag has been depl
5. System Description along with the Conditions For Setting the DTC and the Diagnostic Aids Many times EVAP DTCs are not cur rent But this doesn t mean they should be cleared immediately Always try to dupli cate the condition If you can t don t clear the DTCs They usually will offer some insight into the condition Reviewing the Fail Records vehicle mileage since the last diagnostic test failed for example may indicate how often the condition that caused a DTC to set occurs If there is a high amount of mileage between failures chances are there is a very small leak in the system EVAP System Tests Before the PCM can run the EVAP sys tem tests certain parameters must be met such as an appropriate fuel tank level ambient temperature coolant temperature etc See the service manual for all para meters In the EVAP test cycle the PCM first looks for excess vacuum buildup during normal canister purging Normal canister purging requires the vent solenoid to be off open to vent and the purge solenoid to be on applying vacuum Simultaneously another test run by the PCM during normal purging monitors the oxygen sensors for a fuel trim shift toward rich indicating sufficient loading of the can ister These tests are the setup for the leak tests When the PCM determines that the canister was not sufficiently loaded during purge it will turn on the vent solenoid A blocked vent path is anticipated to
6. age 1 Bulletins September 2000 This review of service bulletins released through mid September lists the bulletin number superseded bulletin number if applicable sub ject and models GENERAL INFORMATION 00 00 89 018 July 2000 Bulletin Summary 2001 and Prior Passenger Cars and Trucks 00 00 89 019 New Electrical Relay Labor Operation Numbers 2001 and Prior Passenger Cars and Trucks 00 00 89 020 September 2000 Labor Time Guide Updates 1996 2001 Passenger Cars and Trucks 00 00 89 021 Cross line Warranty 2001 and Prior Passenger Cars and Trucks HVAC 99 01 39 006A Replaces 99 01 39 006 Production Changes to A C System Components Revisions to Reduce Possible Passenger Compartment Hiss Noise and New Charging Guidelines 1999 Chevrolet Corvette 00 01 37 003 Delphi Harrison and Denso A C Compressor Usage 2000 2001 Chevrolet and GMC C K Pickup Models With 4 8L 5 3L or 6 0L Gen III Gas Engine VINs V T U RPOs LR4 LM7 LO4 00 01 38 006 Essential Tool J 43600 ACR 2000 1993 2001 Passenger Cars and Trucks Except Medium Duty Trucks SUSPENSION 00 03 10 003 Replaces 60 05 02 General Motors Tire Warranty 1996 2001 Passenger Cars and Light Duty Trucks Except Saturn Models BRAKES 00 05 22 007 Reduced Brake Pad Lining Life Install New Brake Booster Pushrod Lever 1997 98 Chevrolet and GMC T Series Medium Duty Tilt Cab Models With Hydraulic Brakes RPO JE3 Built Prior to Januar
7. carbon was designed to absorb and retain hydrocarbon vapors emanating from the fuel tank or the carburetor bowl A pulse width modulated purge sole noid controlled engine vacuum supply to the canister When the conditions were correct usually under certain high throttle angles and engine RPM in a closed loop the ECM would actuate the purge sole noid The vacuum applied to the canister would pull fresh air into the canister through an integral vent forcing the hydro carbons Into the intake air charge and burn ing them in the engine during normal com bustion The fresh air vent on the canister also prevented system overpressure when the vehicle was parked for long periods The fuel cap also provided an alternate vent path if there was a vent failure of both vac uum and pressure OBD Il When OBD II was introduced some components were added to the EVAP sys tem to aid the PCM in system diagnostics The first addition was a vent solenoid which provided a way to control the vent path in order to test for leaks Unlike the purge solenoid it is not pulse width modu lated Its valve is normally open to atmos pheric air when the solenoid is off The PCM turns the solenoid on to close the valve when running system tests Another new OBD II component was the fuel tank pressure sensor It is typically mounted on or near the fuel tank pump and sender module This sensor is a three wire strain gage similar in operation and a
8. create a vacuum condition in the fuel tank If it does not a large leak is detected and DIC P0440 is set or a gross leak is detected and DIC P0446 is set If the PCM sees the vacuum build in the system it will turn off the purge sole noid and monitor the fuel tank pressure sensor for vacuum decay or vacuum increase Vacuum decay indicates a small leak above a calibrated amount and an increase in vacuum would mean a purge solenoid problem The testing conditions vary slightly for EVAP systems from vehicle to vehicle so consult the service manual under Conditions for Running the DTC for each set DTC for further clarification of the enable criteria Using the Tech 2 The Tech 2 is the most powerful and essential tool for EVAP system diagnostics Under Powertrain Special Functions the EVAP System menu contains essential out puts for testing the system The four most common are Purge Solenoid Vent Solenoid System Performance and Seal system Purge Solenoid and Vent Solenoid Tests Purge Solenoid and Vent Solenoid are simply tests that allow you to actuate each solenoid individually If you are working on a vehicle with a DTC P0446 EVAP canis ter vent blocked for example what would you do to verify the condition is present With the vehicle running activating the Purge Solenoid test should not cause the fuel tank pressure to go excessively into vacuum If it does you have verified the presence of the condition an
9. customer to pro tect the paint finish Removing TPF Film TPF film can be removed from the vehi cle by using water pressure With the vehicle in a wash bay area e Wet the vehicle thoroughly with cold or warm water Never use hot water to remove the film The TPF film is designed to remove easily from paint surfaces at ambi ent temperatures between 60 F and 90 F e Peel the film off by hand or use water pressure from a garden hose or a pressure washer from a manual car wash system e t may be efficient to combine the peeling of the film with one hand while directing the water with the other Place a wire screen over the drain to stop the film from entering the drainage system The Transseal TPF film is classified as a Class I Non hazardous Industrial waste and may be disposed of according to local city and state disposal regulations It also 4 trap resistant resistant latch in the kit opens the trunk normally but cannot be relatched without the user performing a reset function This function is a simple oper ation for an adult but is diffi cult for a young child to per f The rear seat tether kit is latch and if required if the vehicle is required a equipped with a pass through rear seat to the rear compartment or a tether kit folding rear seat that can be Thekits unlatched from within the pas T senger compartment without a hen the use of a key or other lock Ae EE ing feature The tether kit pro
10. d ammonia may be used The vehicle should then be thoroughly rinsed with warm water Gary McAdam Return to page 1 2000 Pontiac Grand Prix DTCs Not in Service Information There may be several possible inter mittent Vehicle Theft Deterrent RPO PK3 DTCs B3022 B3023 B3024 B3025 and or a crank no start condition exhibited on some 2000 Pontiac Grand Prix models Currently there is no information about these DTCs in the Service Information These DTCs are B3022 fuel enable circuit range performance B3023 fuel enable circuit low B3024 fuel enable cir cult high and B3025 fuel enable circuit open When diagnosing these DTCs keep in mind that this system is not a Class 2 system The components consist only of the VID module the PCM and related wiring For any of the above DTCs discon nect the VID module connector located near the base of the steering column With the key On measure the harness side connector CKT 229 for the 5V 12V voltage pull up If zero volts are measured check CKT 229 for an open or short to ground If the circuit checks out OK check the connec tions at the PCM for poor contact or shorts to ground Replacing the PCM is a possible repair correction only if the circuit and connections are OK If 5V 12V are measured check the connection at the VID module right where the original disconnect was made for poor connections or shorts to ground If the connections are OK replace th
11. d can utilize this test after removing various vent path components to help aid in diagnostics The Vent Solenoid test can be similarly used to test the purge solenoid A DIC P1441 EVAP system flow during non purge can be verified with the vehicle run ning and by turning on the vent solenoid Assuming that the purge solenoid is off the tank pressure should not be decreasing System Performance Test Using other Tech 2 tests you can recreate the testing performed by the PCM Here is another example On a vehi cle with a DTC P0440 EVAP system large leak detected your first instinct should not be to tighten the fuel cap but instead to use the Tech 2 Return to page 1 peu EVAP ValvelSolenoid Purge From the EVAP System menu select system Performance This test will actuate both the purge and the vent solenoids What s the anticipated result with the vehi cle running The open purge solenoid and closed vent solenoid should create vacuum in the tank at a level high enough to abort the testing on the Tech 2 If the Tech 2 does not abort the testing at this point check for a loose fuel cap If you tighten the cap and then the Tech 2 aborts the test you have found the source of the DTC P0440 Seal System Test and the EVAP Diagnostic Station The last test found on the Tech 2 Seal System iS used in conjunction with the J 41413 EVAP Diagnostic Station This tool consists of a sturdy green cart
12. e VTD module The service information will be cor rected shortly Lost AMCOR Wheel Lock Key and Identification Card If the wheel lock key and or identifica tion card for 1994 2001 Chevrolet Camaro Corvette and Pontiac Firebird models and 1994 96 Chevrolet Impala models has been lost a replacement can be obtained in either of following ways 1 Fill out and send in the registration card with a check for 10 to AMCOR Wheel Locks 12955 Inkster Rd Livonia MI 48150 Allow 5 7 days from the receipt of the order AMCOR will return the I D Card with the key 2 Send a fax with the wheel lock identification number VISA or MC account number and expiration date name ship to address and a daytime phone number with area code to 734 266 6927 There is a 1 50 process fee for faxed orders Shipping costs are 11 50 for standard shipping and 26 50 for express orders Customers who have lost their identi fication card should call AMCOR directly for assistance with finding a GM dealer in their area that has AMCOR master key sets AMCOR can be reached at 734 458 8920 8 30 a m 4 30 p m Eastern time Regal and Monte Carlo Headliner Sag The interior roof trim panel headliner may sag at the rear glass on some 2000 01 Buick Regals and Chevrolet Monte Carlos due to insufficient adhesive Add Velcro or adhesive to resecure the trim panel Do not replace the trim panel GM Technical Assistance Tracker R
13. e the applica tion Is opened The system will display a message that it is updating the TIS 2000 applications Dealerships that do not run the TIS 2000 applications off of the GM ACCESS system will continue to receive Data CDs on a monthly basis TIS Data CDs also may be sent out periodically to all users for large data updates and to act as backups for the TIS 2000 data Kurt Kilar Common Diagnostics for Keyless Entry Systems GM uses four differ ent Keyless Entry sys tems Keyless Entry A with a dedicated receiver module that does not communicate with the Body Control Module or the Tech 2 tool Keyless Entry C with a dedicated module and Class 2 serial data com municating with the BCM and other modules Keyless Entry X with a dedicated module and a keyless entry serial data line communicating with the BCM only Keyless Entry Up Integrated with the receiver integrated into the BCM GM also uses a large number of Keyless Entry Transmitters fobs depending on plat form body styles A com mon diagnostic strategy has been developed to save time in diagnosis This diagnostic strategy will be similar for all Keyless Entry systems and will be tailored for each service manual to the exact vehicle system and wiring for that vehi cle line The Keyless Entry Inoperative table in all of the service manuals will start off by verifying the customer s complaint You should also read the
14. ear Seat Belt Buckle Positioning Each seat belt latch plate in every vehicle is designed to connect only to the matching buckle This ensures that the seat belts are buckled prop erly On 1999 2000 Chevrolet Tracker 4 door models rear seat passengers may confuse the center and left rear seat belt buckles which may lead to customer questions and unnecessary parts replacement The center rear seat belt buckle on the Tracker is located outboard of the left buckle when the buckles are not in use When in use the center and left seat belt buckles cross over each other To make it easier to identify the rear seat belt buckles the center buckle is clearly marked CENTER on the buckle cover and on the matching center rear latch plate Beginning with the 2001 model year the center rear seat belt buckle cover has been changed to a light gray color Plus all center rear seat belt service replacement parts for the 1999 2000 and 2001 model years will be light gray in order to differenti ate them from the left and right rear seat belt components In the rear seat floor pan the cen ter buckle is located outboard of the left buckle and the center latch plate is located outboard of the right buck Left Buckle Center Buckle le If the latch plate or buckles are ever removed they must be rein stalled correctly in order to maintain their effectiveness For more details and additional graphics illustrating the cor
15. ed with DTC P0442 EVAP small leak may require a different approach Once pressure decay is verified a trigger bottle of soapy water may be 7 required to test components and compo nent fittings for a small inaudible leak Soap should be chosen carefully as any that contain ammonia may corrode metal parts Rinse any area tested with soapy water with clean water afterwards Fuel Cap Adapters If it s necessary to raise the vehicle a fuel cap adapter may be used There are currently four different fuel cap adapters J 41415 10 20 30 and 40 that fit the various types of cap designs Fuel cap adapters have become neces sary in testing for one other reason With the advent of ORVR On board Refueling Vapor Recovery the fuel tank and filler neck architecture have changed No longer is there a vent tube running parallel to the filler tube The filler tube is now much smaller to provide a seal preventing the loss of hydrocarbons during Till The fuel vapors are sucked down the neck by a venturi effect created by the rushing fuel and collected by the EVAP Canister Also integrated in the filler design is an anti spit back check valve in the base of the Tiller neck at the tank During pressurized system leak tests using the vehicle s underhood service port testing pressure may never make it to the filler neck due to the level of fuel in the tank and the anti spitback valve The valve creates a positive seal under p
16. ht Intrigue and Silhouette 1999 Pontiac Bonneville Grand Prix and Montana With Hydra Matic 4165 E RPO MN3 MN7 or M15 and 3 4L 3 5L or 3 8L Engine VINs E H K 1 RPOs LA1 LX5 L36 L67 00 07 30 015 Revised DTC Tables for P0716 and P0717 Section 7 Automatic Transmission 1998 2000 Chevrolet and GMC C K Models and G Van With Hydra Matic 4L80 E Automatic Transmission RPO MT1 00 07 30 016 Removal of the PWM Filter From the Spacer Plate 4T40E 4T45E Automatic Transmission 1998 2000 Chevrolet Cavalier and Malibu 1998 1999 Oldsmobile Cutlass 1999 2000 Oldsmobile Alero 1998 2000 Pontiac Sunfire 1999 2000 Pontiac Grand Am With 4T40E or 4T45E Automatic Transmission RPOs MIN4 MNb 00 07 31 001 Clutch Noisy Slipping or Inoperative Replace Clutch Release Bearing 1990 2000 Chevrolet and GMC C6 7 Conventional Medium Duty Trucks 1993 2000 Chevrolet and GMC B7 School Buses With Gas or Diesel Engine and Spicer 310 mm Clutch RPO MRJ Valeo 13 Inch Clutch RPO MPJ or Midland Lipe Clutch Built Prior to May 24 2000 and VIN Breakpoints BODY AND ACCESSORIES 99 08 48 001A Replaces 99 08 48 001 Wind Noise from Body Side Quarter Window Replace Body Side Quarter Window Assembly 1999 2000 Chevrolet and GMC C K Extended Cab Pickup Models Silverado and Sierra Built Prior to February 1 2000 00 08 49 009 Addition of DTC B2961 Diagnostics 2000 Chevrolet and GMC C K Pickup and Utility Models 2000 Chevrolet S T M
17. ir ror patch and fully seated around the circumference In addition the mirror glass retainer may not be fully seated into the power mirror motor assembly or into the retainer on manual mirrors Press the center area of the reflective surface to ensure that the mirror glass retainer is fully seated snaps in place in the power mirror motor or in the mirror retainer on manu al mirrors Darryl Butler Return to page 1
18. k Avenue and Regal 2001 Chevrolet Impala and Monte Carlo 2001 Pontiac Bonneville and Grand Prix With 3 8L Engine VIN K RPO L36 00 06 04 033 Enhanced Emission Inspection Maintenance Program Emissions Diagnostic Manual for OBD II Vehicles 1996 2000 Passenger Cars and Trucks 00 06 04 037 Service Engine Soon SES Light On With DTCs P0716 and or P0717 Set Repair Inout Soeed Sensor Wiring at Transaxle Wiring Pass thru Connector 2000 2001 Chevrolet Cavalier and Malibu 2000 2001 Oldsmobile Alero 2000 2001 Pontiac Grand Am and Sunfire 2000 Toyota Cavalier 00 06 04 038 Unwanted Switch to Gasoline Fuel Indicator Lamp FIL Inoperative Cooling Fan Inoperative Engine Running Hot and or Overheating Replace Cooling Fan CNG Fuse 2000 Chevrolet Cavalier With 2 2L Engine VIN 4 RPO LN2 and Bi Fuel CNG RPO KL6 TRANSMISSION TRANSAXLE 00 07 29 001 4 3 Downshift Gear Clash 1 2 Upshift Gear Clash When Cold Replace Affected Gear Synchronizer Ring Synchronizer Assembly and Transmission Fluid 1999 2000 Chevrolet Tracker With 5 Speed Manual Transmission RPO M59 00 07 30 002A Replaces 00 07 30 002 Slips Harsh Upshift or Garage Shifts Launch shudders Flares Erratic Shifts and Intermittent Concerns DTC P1811 or P0748 Set Replace Pressure Control Solenoid Valve Assembly 1999 2000 Buick LeSabre Park Avenue Ultra Regal and Riviera 1999 Chevrolet Lumina Monte Carlo and Venture 1999 Oldsmobile Eighty Eig
19. mation on whether your vehicle may benefit from the information Inclusion in this publication is not neces sarily an endorsement of the individual or the company Copyright 2000 General Motors Corporation All rights reserved Return to page 1 Techline News TIS 2000 Updates Broadcast via Satellite TIS 2000 Data CD 17 will be the last CD dealerships receive on a regular basis to update their TIS 2000 applica tions After CD 17 TIS 2000 will be updated via broadcasts through the GM ACCESS satellite communications sys tem With the broadcasts the TIS 2000 application data including Service Programming System and the Tech 2 will be updated automatically every two weeks This will provide dealerships with up to date calibration and VIN infor mation while eliminating the need to load TIS 2000 Data CDs to the GM ACCESS file server in the dealership In order to prepare for the satellite broadcasts it is important that all GM ACCESS TIS 2000 users load Data CD 17 promptly The updates that will be broadcast to the GM ACCESS server will build off of the data that is on CD 17 If the dealership s server is not updated with CD 17 the satellite broadcasts will not be received Data CD 17 also should be retained for backup purposes When new data is received from the satellite broadcasts the TIS 2000 appli cation will automatically look for and pull down the updates off of the GM ACCESS server each tim
20. odels and M L Vans 2000 Oldsmobile Bravada 00 08 51 001 Outside Rear View Mirror Housing Turns Chalky Dull Color Clear Coat Mirror 1998 2000 Buick Century Park Avenue and Regal 1998 2000 Chevrolet Cavalier Lumina Malibu Metro Monte Carlo Prizm Tracker and Venture 2000 Chevrolet Impala 1998 2000 Oldsmobile Intrigue and Silhouette 1999 2000 Oldsmobile Alero 1998 2000 Pontiac Bonneville Grand Am Sunfire and Trans Sport 1998 2000 Chevrolet and GMC C K S T Models and M L Van 1998 2000 Oldsmobile Bravada 00 08 52 004 Intermittent Operation of Remote Keyless Entry System Replace Instrument Panel Cluster 2000 Chevrolet Impala and Monte Carlo 00 08 61 002 Engine Mount Crossmember Cracking Replace Crossmember and Fasteners 1993 2000 Chevrolet and GMC B6 7 Medium Duty School Bus Models With 3116 3126 Caterpillar Diesel Engine 00 08 62 002 Brush Guard Removal 1999 Chevrolet Tahoe Utility Models With Off Road Chassis Package RPO Z71 Alero Outside Rearview Mirror Vibration The outside rearview mirror on some 1999 2001 Oldsmobile Alero models may vibrate at all speeds There also may be excessive wind noise coming from the A pillar area of the vehicle The vibration and windnoise may be caused by the breakaway mirror not being properly seated at the mirror patch Cycle the mirror housing forward and rear ward to allow the mirror to snap back Observe the mirror hous ing It should be flush to the m
21. outfitted with two gages and a set of hoses The bottle installed on the cart contains dry nitrogen gas a non toxic inert gas 79 of what you are breathing right now Is nitro gen that is safe to use to pressurize the fuel system An in line regulator keeps the nitrogen pressure typically less than 30 inches of water pressure approximately 2 psi The black hose attached to the cart Is for a built in vacuum gage on the right side of the top panel The blue hose is designed to go into your shop ventilation system to carry the fumes away from the work area upon system depressurization The red hose has the service fitting on the end to be attached to the vehicle s service port for diagnostics Be sure to check the J 41413 Diagnostic Station for leaks before begin ning any diagnostics Turn on the nitrogen bottle and attach the red service hose to the test port Next twist the dial on the face panel to the 9 o clock position to charge the hose with pressure Turn the dial to the 12 o clock position for pressure hold and watch to see if the pressure Fuel Limiter Valve EVAP Vent Valve ap Solenoid Fuel Filler Pipe Spi Back Check Valve Fuel Sender Assembly degrades for a period of a few minutes If pressure degrades the diagnostic station needs to be repaired The theory of testing for leaks is sim ple Using the Tech 2 Seal System test the PCM actuates the vent solenoid and pre vents the actuation of
22. oyed you must proceed with caution Here s why Even though the deflated air bag will be hanging from the module you cannot tell by looking whether only one or both of the initiators were employed It s pos sible that the stage 2 initiator Is still active SO you must always treat a deployed dual stage air bag module as active This means that you cannot dis pose of a dual stage module until you have energized both initiators The pro cedure Is spelled out in detail in the service manual It involves use of a special Deployment Harness J 38826 75 which has two connectors one for each Initiator And if you are handling an instrument panel inflator module you must first attach it to the J 39401 B Deployment Fixture If you are deploying a dual stage inflator module with stage 1 already deployed the movement and noise caused by stage 2 may be reduced because only the initiator is involved the stored gas was already used up when the air bag inflated in the colli sion Be sure to consult the appropriate service manual sections before per forming any service to the dual stage air bag system Chuck Wieseckel contributed to this story fore Gaps i A E a a Sensing and Diagnostic Module SDM Service _ Information Path Model Year Make Model Service Manual Restraints SIR Specifications Schematic and Routing Diagrams Component Locator Diagnostic Information and Procedures Repair Instruc
23. ppearance to a manifold absolute pres sure MAP sensor However these parts are not calibrated to the same bias and are not interchangeable The PCM uses the pressure sensor to detect pressure or vac uum in the fuel system in various tests In addition the fuel level sensor pro vides a direct input for the PCM that is used to determine if the fuel tank level is appropriate for testing typically 15 to 85 Fuel caps also changed with OBD Il Venting characteristics under pressure and vacuum were changed to make the caps fall within testing parameters An aftermar ket fuel cap may not conform to these test standards and may be the cause of a set DTC Diagnosis and DTCs With all of your diagnosis begin with the most likely source of leaks the con nections between system lines and com ponents such as the connections at the canister Also pay close attention to the seam on the filler neck and the o ring at the fuel tank sending unit Check for kinked or incorrectly routed vacuum lines as well Take diagnosis one step at a time and systematically test from one end of the system to the other Isolate each part of the system Also check any parts that were removed during other repairs that may have created a leak When following the diagnostic tables in the service manuals for each EVAP DTC remember that the tables are based on current conditions If there is an intermit tent leak without a current DTC set review the
24. rect posi tions of each of the rear seat belt buckles on 1999 2000 Trackers check out bulletin 99 09 40 002A Donald B Sherman Right Center Buckle Latch Plate Return to page 1 Finding that EVAP Leak A leaking Evaporative Emissions EVAP system can produce more hydrocarbons in a day than what is emitted from the tailpipe of a properly operating vehicle dur ing the consumption of a complete tank of fuel Catching those leaks is one of the main reasons behind OBD Il In the past many leaks were often caused by owners who for example did not fully tighten the fuel cap Now as those large leaks decrease as owners become more educated about the EVAP system small leaks pose a greater chal lenge to technicians Most small leaks are hard leaks in the system which cannot be corrected by software calibration changes Currently there are no EVAP software issues or new calibrations being developed to address leaks Repairing EVAP conditions takes an understanding of the EVAP system and the related tools needed to troubleshoot EVAP DTCs EVAP Basics The EVAP system includes the follow ing components e fuel tank e EVAP vent valve e fuel pipes and hoses e fuel Till cap e EVAP vapor pipes e EVAP purge pipes e EVAP canister e EVAP canister purge valve From the early 1980s until the advent of OBD Il the system was virtually unchanged A canister filled with charcoal or in later years activated
25. ressure whereas under vacuum the way it is test ed by the PCM the valve allows for venti lation of the system and testing fails Therefore a technician not using a fuel cap adapter typically adapter J 41415 40 Is used on ORVR systems may never see a pressure decay if the leak is in the filler neck or fuel cap Testing with the Diagnostic Station through a fuel cap adapter can help to find these leaks Confirming Repairs Once the leak is found and repaired another noteworthy Tech 2 feature under Powertrain Special Functions is Service Bay Tests EVAP System This test func tion helps the PCM run the diagnostics for the various EVAP system DTCs more quickly broadening the enable criteria for purposes of verifying the repair of the vehi cle This is a critical step in preventing an EVAP related comeback Keep in mind that two consecutive passes are needed when confirming a repair If it passes once in the service department it may not pass again in the owner s driveway As with all repairs checks should be made for any applicable bulletins and cali brations that address EVAP conditions Presently however there are not any new calibrations being developed for current EVAP systems EVAP system leaks can be hard to find But if you know what causes each DTC to set and understand how to use the tools available to you you ll be well on your way to expertly diagnosing EVAP conditions Craig Blake Return to p
26. tec tion to help maintain their luster Transseal Temporary Protective Sheet Film TPF a non adhesive breathable temporary protec tive film is being used to protect the paint finish from mutilation and environmental damage while the vehicle is being transport ed and when in vehicle storage at the deal ership The Transseal TPF acts as a skin or membrane that allows the paint surface to breathe or out gas while protecting the fin ish It can be used over sheet metal TPO RIM SMC and many other types of painted and molded automotive materials When it is applied the TPF film reacts like a shrink wrap packaging material and conforms to the surface of the vehicle It s recommended to leave the film on when securing items in the trunk Such use of the trunk release handle could damage it and prevent proper opera The trunk release latch handle is serviced as one com ponent with the rear compart Onn ment lid latch assembly Trap Resistant Trunk Kit For most 1990 2000 pas senger cars with trunks a retrofit trap resistant trunk kit is available Check bulletin 99 08 66 002A for the complete details on the system s func tions vehicle modifications and part numbers required to install the kit The trap resistant trunk kit includes three main system components an LED illuminat ed interior release handle a Retrofit trunk kit the vehicle while it is in dealer inventory until time of delivery to the
27. the purge solenoid to prepare the system for pressure testing Pressure is used rather than vacuum to aid in locating the leak Pressure leaks are out wardly audible or may be detected with a soapy water solution Snoop Liquid Leak Detect trom Kent Moore J 41365 or equivalent may be used Using the diagnostic station apply a small amount of pressure typically 5 to 7 inches of water column pressure This is a process that can vary in time depending on the amount of fuel in the tank If the sys tem does not pressurize locate the leak using the J 41416 Ultrasonic Leak Detector and repair immediately The pressure apply may be modulated by turning the dial on the Diagnostic Station toward the 9 o clock position from the 12 o clock position Watch the fuel tank pressure reading on the Tech 2 to see if it is approaching the pressure gage reading on the left side of the J 41413 panel After flow is stopped pressure readings will stabilize within a few seconds Add more pressure as nec essary to reach the desired testing level The next step is to watch for any decay of pressure The general area of a rapid pressure loss typically may be located with the ultrasonic leak detector This device Is sensitive to specific sounds associated with air leaks Be careful to use this tool in an area that is free of other sources for air noise such as leaky shop lines or fittings alr tools spray cans etc Soapy Water Testing Leaks associat
28. tions Description and Operation Special Tools and Equipment GM TechLink is a monthly magazine for all GM retail technicians and service consultants providing timely information to help increase knowledge about GM products and improve the performance of the service department This maga zine is a companion to the GM Edge publication VSSM Communications Gracemary Allen Publisher amp Editor Mark Stesney GM Service Operations lt Mark Stesney GM com Technical Editors Mark Spencer lt lt Mark Spencer SandyCorp com 1 248 816 3647 Jim Horner lt sJim Horner SandyCorp com 1 248 816 3641 Production Manager Marie Meredith Desktop Publishing Greg Szpaichler MediaWurks lt sispake mediawurks com FAX number 1 248 649 5465 Write to gt lt TechLink PO Box 500 Troy MI 48007 0500 General Motors service tips are intend ed for use by professional technicians not a do it yourselfer They are written to inform those technicians of condi tions that may occur on some vehicles or to provide information that could assist in the proper service of a vehicle Properly trained technicians have the equipment tools safety instructions and know how to do a job properly and Safely If a condition is described do not assume that the bulletin applies to your vehicle or that your vehicle will have that condition See a General Motors dealer servicing your brand of General Motors vehicle for infor
29. vides a secondary lock of the two LEDs seatback that illumi nate when The trap resistant trunk kit the trunk lid also requires a rear trunk lid closes The ajar switch If the vehicle LEDs remain being retrofitted is not illuminated equipped with a trunk lid ajar for about one switch one must be ordered hour after the and installed trunk lid is S R closed Coming in a few months Truck release handle now in production the new automatic TrapAlert The trap System will be available It is designed to open the trunk automatically if the electronic sensor detects motion and a difference of temperature in the trunk More details about this new system will be com ing shortly John Force Jerry Garfield may be recycled back into the plastics industry The Paint Finish The TPF film is designed to leave the paint finish with a micronized polish There should be no need to wax or buff the paint finish after removing the TPF film If a slight haze appears on the paint sur face from the TPF film it can be removed by washing the vehicle by hand with soap and water If there are any witness marks from the water after removing the TPF film park the vehicle outside and allow the heat from the sun to warm the paint finish and dry the vehicle Any TPF film residue also may be removed by using a small amount of the GM OptiKleen windshield washing con centrate solution If any residue remains general househol
30. y 28 1998 00 05 23 005 Availability of Rear Wheel Mud Flaps 1999 2000 Chevrolet and GMC C K Pickup Models Silverado and Sierra ENGINE PROPULSION SYSTEM 00 06 01 016 Enhanced Aluminum Engine Component Thread Repair Process 1993 Cadillac Allante 1993 2001 Cadillac Eldorado and seville 1994 1999 Cadillac DeVille Concours 1996 2001 Cadillac DeVille 2000 2001 Cadillac DeVille Touring 1997 2001 Chevrolet Corvette 1998 2001 Chevrolet Camaro 1995 2001 Oldsmobile Aurora V8 1999 2001 Oldsmobile Intrigue 2001 Oldsmobile Aurora V6 1998 2001 Pontiac Firebird With 2 2L 3 5L 4 0L 4 6L or 5 7L Engine VINs F H C 9 Y G S RPOs L61 LX5 L 47 L37 LD8 LS1 LS6 00 06 01 018 Growl Moan Noise During sharp Left Turn Modify Engine Mount Stamping 2000 Chevrolet Cavalier 2000 Pontiac Sunfire With 2 2L Engine VIN 4 RPO LN2 00 06 02 006 Replaces 73 62 14 DEX COOL Engine Coolant Information 2001 and Prior Passenger Cars and Trucks 00 06 04 025A Replaces 00 06 04 025 ABS Light On at High Speeds Above 70 mph or 113 km h Code C0237 Set Install New PCM 2000 Chevrolet and GMC S T Pickup Models With 2 2L Engine VINs 4 5 RPOs LN2 L43 and AL60 E Automatic Transmission RPO M30 00 06 04 028 Bang Slosh From Rear of Vehicle Install Fuel Tank Insulators 2000 Buick Century and Regal 2000 Chevrolet Impala and Monte Carlo 00 06 04 030 Revised Fuel Pressure Operating Range 2001 Buick LeSabre Par
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