CAMPAIGN: LOW (TPS) OUTPUT (INSPECT/REPLACE TPS SWITCH)
SUBJECT: THROTTLE POSITION SENSOR
MODELS: 1991 C, K, R, V, P TRUCKS AND G-VANS
General Motors has determined that certain 1991 C, K, R, V, P trucks and G-Vans with 4.3L, 5.7L, or 7.4L fuel-injected gasoline engines, coupled with the Hydra-Matic 4L80-E electronic transmission (MT1), may have a TPS that exhibits an intermittent low output voltage. This condition may cause no upshift to 4th gear, no TCC, or harsh transmission shifts.
To correct this condition dealers will inspect, and if necessary, replace the TPS switch.
VEHICLES INVOLVED
Involved are certain 1991 C, K, R, V, P trucks and G-Vans with 4.3L, 5.7L, or 7.4L fuel-injected gasoline engines, coupled with the Hydra-Matic 4L80-E electronic transmission (MT1) built within the following VIN breakpoints:
Model Make Plant From Through ------- ----- ----------- ----- ----------- C/K GMC Pontiac East SOP ME534777 Oshawa M1541745 Janesville MJ519682
RN GMC Flint SOP MF520807
P GMC Detroit SOP M3501970
G GMC M7512706 M4512352
The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings are furnished to all involved dealers with the campaign bulletin.
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. Dealers are to correct all affected vehicles in new and used vehicle stock prior to their sale.
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 ensure 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 cor- rection according to instructions contained in this bulletin. If the name and address of the owner of an involved vehicle was unavailable to GMC Truck Division at the time of campaign initiation, the dealer must determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notifi- cation mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.
GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of owner letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing may contain owner names and addresses obtained from State Motor Vehicle Registration records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to this campaign.
SERVICE INFORMATION
A new TPS Kit (P/N 17112679) has been released to address the complaint conditions. The new TPS will have a yellow dot at the connector area for easier identification.
SERVICE PROCEDURE
1. Remove air cleaner, if necessary.
2. Inspect vehicle's TPS for a yellow dot. If the TPS has a yellow dot at the connector area, no further action is necessary. Install "Campaign Identification Label."
3. If the TPS does not have a yellow dot, replace TPS with the new TPS Kit (P/N 17112679). Follow procedures in the 1991 Light-Duty Truck Fuel and Emissions Service Manual, X-9136, Page 3-206.
4. Install "Campaign Identification Label".
PARTS INFORMATION
Parts are to be obtained from General Motors Service Parts Operation (GMSPO). To ensure that these parts will be obtained as soon as possible, they should be ordered from GMSPO on a C.I.O. order with no special instruction code but order under an advise code (2).
Part Number Description Quantity ------------ ----------- -------- 17112679 TPS Kit 1
WARRANTY INFORMATION
Dealers should submit a warranty claim on each vehicle completed under this campaign.
Labor Operation *Time Trouble Number Description Allowance Code --------- -------------- ---------- -------- V6830 TPS-R & R .5 Hr. 96 (C/K, R/V)
V6831 TPS-R & R .6 Hr. 96 (G/P)
V6832 TPS-Inspect. No .2 Hr. 96 further action required.
V6833 TPS-inspect. No .4 Hr. 96 further action required. (G/P)
* For dealer to receive Administrative Time Allowance associated with this campaign, add 0.1 hour to the Labor Operation Time Allowance.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the campaign number and five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ball point pen. Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner. Apply "Campaign Identification Label" only on a clean, dry surface.
ADMINISTRATIVE PROCEDURE
Procedures covering this campaign are outlined in Section V of your dealership's"GM Truck Claims Processing Manual" #P9119.
Dear GMC Truck Owner:
General Motors has determined that the throttle position sensor (TPS) on certain 1991 C, K, R, V, P trucks and G-Vans may exhibit an intermittent low-output voltage. This condition may cause the transmission to have no overdrive and/or harsh transmission shifts.
To correct this condition, the existing TPS will be replaced with a new updated part. This service will be completed for you at no charge.
Instructions for making this correction have been sent to your GMC Truck dealer. Please contact your dealer as soon as possible to arrange a service date. Please ask your dealer if you wish to know how much time will be needed to schedule, process and repair your vehicle. Your GMC Truck dealer is best equipped to provide service to ensure your vehicle is corrected as promptly as possible. However, if you take your vehicle to your dealer on the agreed service date and they do not service this condition on that date or within five days, we recommend you contact your nearest GMC Truck Zone Office by telephone. The Zone Office will assist you and your dealer in getting your vehicle corrected. The telephone numbers of the Zone Offices are listed in your Warranty and Owner Assistance Information Manual.
After contacting your GMC Truck dealer and the Zone Office, it you are still not satisfied that we have done our best to remedy this condition without charge within a reasonable time, you may wish to write the Environmental Protection Division (EN-340F), United States Environmental Protection Agency, 401 M Street, S.W., Washington, D.C. 20460. To ensure your full protection under the emission warranty made applicable to your vehicle by Federal Law, and your right to participate in future recalls, it is recommended that you have your vehicle serviced as soon as possible. Failure to do so could legally be determined to be lack of proper maintenance of your vehicle. Also, your vehicle may fail a state or local emission inspection test if the recall work is not accomplished.
Should your dealer find that your emission system has been intentionally disabled, you will be asked if you wish the system to be restored so that it will function as designed. The cost of such restoration will be your responsibility.
The enclosed postage paid owner reply card identifies your vehicle. Presentation of this card to your GMC Truck dealer will assist in making the necessary correction to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please furnish us complete name and address of the person you sold or traded your vehicle to and return the card to us.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction.
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.
