CAMPAIGN: ECM CIRCUIT DEACTIVATES RWAL
Models: 1988 CK 200 with 6.2L Diesel engine (LH6) and THM 700-R4 Automatic Transmission (MDB)
TO: ALL GENERAL MOTORS DEALERS
CONDITION:
--------- General Motors of Canada has determined that certain 1988 "C-K" light duty trucks equipped with 6.2 litre diesel engines and THM 700-R4 transmission fail to conform to the requirements of Federal Motor Vehicle Safety Standard (CMVSS) 105 "Hydraulic Brake Systems". The rear wheel antilock (RWAL) brake feature on these trucks could unintentionally become disabled by an electrical malfunction. The front and rear brakes will continue to work properly, but the brake warning indicator lamp on the instrument panel will fail to light and inform the driver of the RWAL disablement. Failure to light the brake warning indicator lamp is a nonconformance to CMVSS 105 requirements.
To prevent the possibility of this condition occurring it will be necessary to install a jumper wire harness between the transmission connection and the engine wire harness on all involved vehicles.
VEHICLES INVOLVED:
Involved are certain 1988 CK 200 Pickup Trucks built before early October, 1987 and equipped with 6.2L diesel engines (LH6) and THM 700-R4 automatic transmissions (MD8) built within the following VIN breakpoints:
Model Year Model Plant From Through ---------- ----- ----- ---- ------- GMC 1988 CK 200 Oshawa J1522327 J1526975
CHEV 1988 CK 200 Oshawa J141859 J1171232
All affected vehicles have been identified by the VIN listing provided to involved Dealers with this bulletin. Any Dealer not receiving a listing was not shipped any of the affected vehicles.
DEALER CAMPAIGN RESPONSIBILITY:
Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.
Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your Dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling or releasing the vehicle.
Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the Dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.
CAMPAIGN PROCEDURE:
Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.
OWNER NOTIFICATION:
All owners of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors. The listings provided are for campaign activity only and should not be used for any other purpose.
PARTS INFORMATION:
Parts will be supplied to Dealer no charge through the Zone Office.
Description Part Number ----------- ----------- Jumper Wire NPN Tie- Wrap 3816659
PARTS AND LABOUR CLAIM INFORMATION:
Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card, RAPID terminal or DCS transmission in accordance with the following:
Repair Code Description Time Allowance ----------- ----------- -------------- 2A Install Jumper Wire Harness .3
Time allowance includes 0.1 hour for Dealer administrative detail associated with this campaign.
An amount of $2.35 will be paid for parts handling.
SERVICE PROCEDURE:
1. Disconnect engine harness TCC connector from transmission (see Figure 1).
2. Plug jumper harness into transmission and engine TCC connectors.
3. Tie-wrap engine and transmission TCC connectors back to body of harness.
INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL
Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.
Dear General Motors Customer:
This notice is sent to you in accordance with the Canada Motor Vehicle Safety Act.
General Motors of Canada has determined that certain 1988 "C-K" light duty trucks equipped with 6.2 litre diesel engines and THM 700-R4 transmissions fail to conform to the requirements of Federal Motor Vehicle Safety Standard (CMVSS) 105 "Hydraulic Brake Systems". The rear wheel antilock (RWAL) brake feature on these trucks could unintentionally become disabled by an electrical malfunction. The front and rear brakes will continue to work properly, but the brake warning indicator lamp on the instrument panel will fail to light and inform the driver of the RWAL disablement. Failure to light the brake warning indicator lamp is a nonconformance to CMVSS 105 requirements.
To prevent the possibility of this condition occurring it will be necessary to install a jumper wire harness between the transmission connection and the engine wire harness on all involved vehicles. This service will be completed for you at no charge.
Instructions for performing this service have been sent to your GM Dealer. Please contact your Dealer to arrange a service date. The labour time necessary to install the jumper wire harness in your vehicle will be approximately 15 minutes. Please ask your Dealer if you wish to know how much additional time will be needed to process your vehicle.
This letter identifies your vehicle. Presentation of this letter to your Dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions 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 information on whether your vehicle may benefit from the information.
