CAMPAIGN:DIESEL ENGINES HIGH EMISSIONS. GMC Truck Caballero 1984

For 1990-2009 cars

# CAMPAIGN:DIESEL ENGINES HIGH EMISSIONS

#### MODEL: 1984 CABALLERO MODEL TRUCKS EQUIPPED WITH 5.7L DIESEL ENGINE (RPO LF9) AND FEDERAL EMISSIONS (RPO NA5).

General Motors has detemined that certain early built 1984 Caballero Model Trucks equipped with a 5.7L diesel engine and federal emssions may bave been built incorrectly and therefore may not comply with exhaustt emissions standards.

Vehicles involved were manufactured with the wiring harness leads to the altitude advance diode reversed and leads to the cold advance diode reversed.

#### Vehicles Involved:

The following five (5) 1984 Caballero ModelTrucks equipped with a 5.7L diesel engine (RPO LF9) and federal emissions (RPO NA5) are involved:

Zone Dealer VIN ---- ------- --- 21 21 134 1GTCW80N6ER500074

10 10 566 1GTCW80NXER500188

36 36 020 1GTCW80N1ER500192

53 53 354 1GTCW80N5ER500227

42 42 065 1GTCW80N3ER500369

The specific vehicles involved have been identified by Vehicle Identification Number Listings contained in this bulletin.

The specific vehicles involved in this campaign have been identified by Vehicle Identificatiai Number Computer Listings. listings are fumished 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.

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.

If no owner' s name and address available to GMC Truck at the time of campaign initiation, the dealer will 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 notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplier yellow campaign envelopes.

GMC Truck General Motors Corporation 101 Union Street Plymouth, Michigan 48170

#### OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck (see copy of owner letter included with this bulletin). A listing of owners 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 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 PROCEDURE

1. Open hood.

2. Remove the altitude advance diode located on the engine wiring harness above the master cylinder. Refer to Figure 1.

3. With a small screwdriver, unlock the wire terminals from the engine wiring harness connector and remove the terminals from the connector.

4. Reverse the position of the two terminals and reinstall into the connector.

5. Reinstall the diode assembly on the engine wiring harness.

6. Locate the altitude advance diode located above the master cylinder. Refer to figure 1.

7. Follow the light green/black wires from the altitude advance diode into the wiring harness conduit (approximtely 14") to the taped splice. Do not remove tape from splice.

8. At this point you should see silver/gray tape which covers the cold advance diode. The diode has a dark green wire and light green wire with a black tracer leading to it.

9. Cut the dark green and light green wires so about 1" of the green wire is left on each side of the cold advance diode leads.

10. The cold advance diode should be soldered back into the harness with its leads reversed. That is; the light green wire on the diode should be soldered to the dark green wiring harness lead and the dark green diode lead should be soldered to the light green harness lead. This procedure can also be performed with electrical wire crimp on splices, if available.

11. Using electrical tape, tape over both solder or crimp joints to insulate them.

12. Carefully tuck the diode and wires back into the engine wiring harness conduit.

#### WARRANTY INFORMATION

Dealers should submit an accurately filled out Warranty Repair order on each vehicle completed under this campaign.

Labor Operation *Time Trouble Number Description Allowance Code ------ ----------- --------- ---- V2261 Reverse leads in wiring harness 0.3 HR. 96 to altitude advance diode and reverse direction of cold advance diode in engine wiring harness.

*For dealers to receive Administration Time Allowance associated with this campaign, add 0.1 hour to the Labor Operation Time Allowance.

#### CAMPAIGN IDENTIFICATION LABEL

Each vehicle modified 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 five (5) digit Dealer Code of the dealer performing the campaign service. This information may be inserted with a typewriter or ballpoint 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 "GMC Truck Claims Processing Manual" issued October, 1981.

Dear GMC Truck Owner:

General Motors has determined that certain early built 1984 Caballero Model Trucks equipped with a 5.7L diesel engine and federal emissions may have been manufactured incorrectly and therefore may not comply with exhaust emissions standards.

The vehicles involved may have been manufactured with two different conditions which may cause the vehicle not to comply with exhaust emission standards.

To correct these conditions your dealer will make the necessary electrical system correction to your vehicle. This service will be performed at no charge to you.

Instructions for making the correction(s) have been sent to your GMC Truck Dealer. The labor time to perform this service is approximately ten minutes. Please allow additional time for your dealer to process your vehicle.

The enclosed Owner Reply Card identifies your vehicle. Presentation of this card to your dealer will assist in making the inspection to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid Owner Identification Reply Card and returning it to us. Should your dealer not schedule a service date within a reasonable time, you should contact your nearest GMC Truck Zone Office either in person or by telephone for assistance. The locations and telephone numbers of the Zone Offices are listed in your Owner's Manual.

If your dealer or General Motors are unable to remedy this condition within a reasonable time, you may wish to advise the Environmental Protection Agency, at the following address: Director, Manufacturers Operation Division (EN-340), 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 a lack of proper maintenance of your vehicle.

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our product.

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.