A/T - Delayed Upshift
NO: 18-09-94GROUP: Vehicle Performance
DATE: Jun. 17, 1994
SUBJECT:
Delayed Upshift
MODELS:
1992 - 1993 (AB) Ram Van/Wagon
1992 - 1993 (AD) Ram Pickup/Ram Cab & Chassis
1992 - 1993 (AN) Dakota/Dakota Cab & Chassis
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH AN AUTOMATIC TRANSMISSION.
SYMPTOM/CONDITION:
The upshift of the automatic transmission is delayed during vehicle acceleration or coast.
This condition may be caused by: corrosion of the transmission throttle lever-to-throttle valve cable connector, a weak transmission throttle valve return spring, or a build up of contaminants around the metal shaft and plastic shield at the transmission end of throttle valve cable.
DISCUSSION:
A correctly adjusted transmission throttle valve (T.V.) cable will cause the transmission throttle valve lever to move simultaneously with the engine throttle body from the idle position. Vehicle performance is substantially affected by slight misadjustments. It is important that the transmission throttle valve adjustment be as accurate as possible.
If the transmission throttle cable requires adjustment, the following procedure can be applied to 1992 and 1993 vehicles:
1. Carefully slide the T.V. cable off of the throttle body stud. Do not pry or pull the cable off. The cable end and the attachment stud should be aligned (centered on one another) to within 1 mm (0.039 in.) in either direction.
2. If not, press the cable lock button inward to release the cable. The lock button only has to move about 2 mm (0.070 in.) to release the cable in its adjuster head.
3. While depressing the lock button (pliers may be required due to high effort), center the transmission throttle cable end on its attachment stud to within 1 mm. (0.039 in.) in either direction.
4. Check cable adjustment. Be sure the transmission throttle valve lever and the lever on the engine throttle body move simultaneously.
DIAGNOSIS:
1. With the engine off, raise the vehicle.
2. Pull the transmission T.V. lever rearward and release the lever. The lever should "snap" back to its closed position if it is operating properly.
3. If the transmission T.V. lever returns slowly or binds, perform the following repair procedure.
REPAIR PROCEDURE:
This bulletin involves verifying that related components are operating properly, as well as, the cleaning and lubrication of the mechanical connection between the transmission T.V. lever ball stud and the T.V. cable socket.
1. Carefully remove the transmission T.V. cable from the transmission T.V. ball stud so as not to disturb other related components.
2. Pull the transmission T.V. lever rearward and release the lever. If the lever returns slowly, inspect for a weak return spring, binding in the T.V. lever mechanism or a binding throttle valve. Correct as required.
3. If the T.V. lever returns quickly without the cable attached, inspect the transmission T.V. cable for binding due to a building up of debris between the cable and its housing. Correct as required by cleaning or replacement.
4. Be sure the plastic sleeve on the end of the T.V. cable is not loose from its cable end connector. The plastic sleeve snaps in place over the connector. Verify free cable movement.
5. Clean all corrosion buildup on the T.V. lever ball stud and in the T.V. cable connector socket with emery cloth.
6. Coat the throttle valve lever ball stud and socket with a liberal application of Mopar Multi Purpose Grease (PN4318063) or an equivalent grease which must have an excellent corrosion and water wash-off resistance.
7. Assemble the T.V. lever to the T.V. cable. Verify that the T.V. lever now returns quickly to its closed position.
8. Lower the vehicle.
9. Verify that the T.V. cable is properly adjusted. Refer to the above Discussion section for assistance.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 21-75-21-91 (AB) Ram Van/Wagon 0.4 Hrs.
(AD, AN) Ram Pickup / Dakota 0.3 Hrs.
FAILURE CODE: 07 - Binds, Sticks or Seized