CAMPAIGN:TRANS. WILL NOT SHIFT FROM PARK POSITION

SUBJECT: TRANSMISSION WILL NOT SHIFT FROM "PARK" POSITION

MODELS: 1993 M/L VAN AND G VAN WITH CRUISE CONTROL (K34)

THIS BULLETIN CANCELS AND REPLACES BULLETIN 93-C-56 ISSUED NOVEMBER, 1994. ALL COPIES OF 93-C-56 SHOULD BE DESTROYED.

The Warranty Information has been revised. The parts allowance statement has been removed. To claim parts allowance please follow the procedure outlined in Article 1.5.2 Reimbursement For Parts in your Service Policies and Procedures Manual.

General Motors has determined that CERTAIN 1993 M/L and G Vans may experience a condition, at temperatures below 32 degrees Fahrenheit, where the transmission will not shift out of PARK with the brake pedal depressed. To prevent this condition from occurring, dealers will replace the cruise control vacuum release valve and check and adjust the BTSI solenoid cable as needed.

NOTE: The Brake Transmission Shift Interlock (BTSI) system is designed to prevent the automatic transmission from being shifted out of PARK unless the brake pedal is depressed.

VEHICLES INVOLVED

Involved are CERTAIN 1993 M/L Vans and G Vans with cruise control (K34) built within the following VIN breakpoints:

Year Model From Through

1993 M/L Van SOP EOP 1993 G Van SOP EOP

The specific vehicles involved in this campaign have been identified by Vehicle Identification Number (VIN) Computer Listings. These listings are furnished to all involved dealers with the campaign bulletin. Dealers should confirm vehicle eligibility through VISS (Vehicle Information Service System) or SERVICENET prior to beginning campaign repairs.

DEALER CAMPAIGN RESPONSIBILITY

All unsold vehicles in dealers' possession and subject to this campaign MUST be held and inspected/repaired per the service procedure of this campaign bulletin BEFORE, owners take possession of these vehicles.

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.

Owners of vehicles recently sold from your vehicle inventory are to be contacted by the dealer and arrangements made to make the required correction according to instructions contained in this bulletin.

In summary, whenever a vehicle subject to this campaign enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.

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 notification 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 PROCEDURE (M/L/G Models, unless otherwise noted) -------------------------------------------------------- Vacuum Release Valve Replacement -------------------------------- 1. Remove knee bolster (G-Van only).

2. Disconnect electrical harness connector from valve. (Figures 1 and 2)

3. Disconnect vacuum hose from vacuum release valve.

4. Remove vacuum release valve by turning it counter clockwise.

5. Remove and retain retainer. Turn the retainer counterclockwise to unseat it.

6. Install retainer removed in step 5. Turn the retainer clockwise to seat it.

7. Install new vacuum release valve until it is seated in the retainer with the brake pedal in the depressed position.

8. Audible "clicks" can be heard as the threaded portion of the valve is pushed through the retainer toward the brake pedal.

9. Pull the brake pedal fully rearward against the pedal stop, until the audible "click" sounds can no longer be heard.

10. Release the brake pedal and repeat Step 9 to assure that no audible "click" sounds remain.

11. Connect vacuum hose.

12. Connect electrical harness connector.

13. Function check brake transmission shift interlock for proper operation:

A. Solenoid must lock gearshift lever bowl assembly whenever steering column is in "PARK" and when trying to shift from "PARK" without pressing brake pedal. (Solenoid is energized when ignition is on and solenoid is extended.)

B. Solenoid must release gearshift lever bowl assembly when pressure is applied to brake pedal. (Solenoid is de-energized.)

14. If system is inoperative, BTSI solenoid cable adjustment is necessary. Perform BTSI Solenoid Cable Adjustment. If operating properly, proceed to step 15.

15. Reinstall knee bolster (G-Van only).

16. Install Campaign Identification Label.

BTSI Solenoid Cable Adjustment

1. Be certain parking brake is engaged and vehicle wheels are blocked.

2. Ignition lock cylinder in "OFF" position (NOT THE LOCK POSITION).

3. Shift column out of "Park" position to "Neutral".

4. A. G-Van Only (Figure 3)

Unlock adjuster lock, pull inner and outer adjuster bodies apart while holding cable at positions (A) and (B). Bowl lock will hit at gearshift bowl.

B. M/L Van Only (Figure 4)

Remove solenoid protector.

The lock button must be disengaged to allow cable movement. Push cable towards solenoid until the bowl lock hits bowl and travel stops. (Do not bow or bend inner cable wire between cable housing and cable fitting.)

5. Let cable move back 1.0 to 2.0 mm.

6. Engage lock button.

7. Install solenoid protector (M-Van only).

8. Check system operation. Refer to Step 13 of vacuum release valve replacement above.

IMPORTANT: During Inspection and Adjustment of interlock solenoid assembly, solenoid will become hot.

9. Re-adjust if needed. If operating properly, proceed to step 10.

10. Reinstall knee bolster (G-Van only)

11. Install Campaign Identification Label.

PARTS INFORMATION

25% of parts required for this campaign will be preshipped to involved dealers of record. This preshipment will occur the week of November 21, 1994. Parts received for recently transferred vehicles should be forwarded by the original dealer (with an accompanying phone call) to the dealer that received the transferred vehicle.

Additional parts for this campaign are to be obtained from General Motors Service Parts operation (GMSPO). To ensure parts are obtained as soon as possible, order them from GMSPO on a C.I.O. order with no special instruction code but order under an advise code (2).

Part Number Description Quantity ----------- ----------- -------- 15995799 Vacuum Release Valve 1

WARRANTY INFORMATION

Dealers should submit a warranty claim on each vehicle completed under this campaign.

Labor Operation *Time Trouble Number Description Allowance Code --------------------------------------------------------------- V9430 Replace Vacuum Release Valve (G .4 hr 96 Van)

V9431 Replace Vacuum Release Valve .3 hr 96 (M/L Van) V9432 BTSI Adjustments .3 hr 96

* 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 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 Warranty Claims Processing Manual" #P9119 Rev. 2/94.

Dear GMC Truck Owner:

As a valued customer, your complete satisfaction with your GMC truck is our goal. In keeping with this goal, we want to let you know that we have discovered a problem that could affect your vehicle and we want to take care of it at no charge to you.

General Motors has determined that CERTAIN 1993 Safari and Vandura Vans may experience a condition, at temperatures below 32 degrees Fahrenheit, where the transmission will not shift out of PARK with the brake pedal depressed. The Brake Transmission Shift Interlock (BTSI) system prevents the automatic transmission from being shifted out of PARK unless the brake pedal is depressed.

To prevent this condition from occurring, dealers will replace the cruise control vacuum release valve and check and adjust the BTSI solenoid cable as needed.

Instructions for performing this service have been sent to your GMC Truck dealer, and parts are available. Please contact your GMC dealer to arrange a service date as soon as possible. This procedure will take about one hour to complete, but you should ask how much additional time your dealer will need to schedule and process your vehicle.

If you experience this condition prior to this repair, please use the following procedure to by-pass the BTSI condition:

Review positions in ignition switch. Refer to your 1993 Owners Manual (Safari Van Owners Manual, pages 2-13 and 2-14. Vandura Van Owners Manual, pages 2-18, and 2-27).

1. Start the engine.

2. Turn the key to "OFF" (one click forward from the "Lock" position).

3. With brakes applied and parking brake engaged, shift to neutral.

4. Start the engine.

5. Shift to desired gear.

6. Release parking brake.

The enclosed postage paid owner reply card identifies your vehicle. Presentation of this card to your 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 the 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 with our product.

GMC TRUCK DIVISION GENERAL MOTORS CORPORATION

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.