A/T - Delayed Gear Engagement After Start Up
NO: 21-08-94GROUP: Transmission
DATE: Apr. 29, 1994
SUBJECT:
Delayed Transmission Engagement/Torque Convertor Drain Back
MODELS:
1990 - 1994 (AB) Ram Van/Ram Wagon
1990 - 1993 (AD) Ram Pickup, Ram Chassis Cab
1990 - 1994 (AN) Dakota/Dakota Chassis Cab
1994 (BR) Ram Truck
1990 - 1994 (XJ) Cherokee/Wagoneer
1990 - 1994 (YJ) Wrangler
1993 - 1994 (ZJ) Grand Cherokee/Grand Wagoneer
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH AUTOMATIC TRANSMISSIONS. THIS BULLETIN DOES NOT APPLY TO VEHICLES EQUIPPED WITH THE 8.0L V10 GASOLINE OR CUMMINS DIESEL ENGINES.
SYMPTOM/CONDITION:
Delayed transmission engagement of 2 to 8 seconds at driveway start up. Most noticeable after the vehicle has been parked for an extended period.
DIAGNOSIS:
Using the Mopar Diagnostic System or the Scan Tool (DRB II or III) with appropriate diagnostic procedure manual, verify that all engine systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference, and repair as necessary. If no codes are present and all systems are functioning correctly, check the transmission fluid level following the procedures outlined in the appropriate service manual. If the fluid level is correct proceed with the following repair.
PARTS REQUIRED:
REPAIR PROCEDURE:
This repair involves installing a drainback relief valve in the transmission oil cooler pressure line.
1. Using the appropriate service manual, locate and identify the transmission oil cooler pressure line (Figure 1 shows a typical transmission cooler hose arrangement).
CAUTION:
IT IS MANDATORY THAT THE TRANSMISSION OIL COOLER PRESSURE LINE BE USED AS TRANSMISSION FAILURE WILL RESULT IF THE WRONG LINE IS CHOSEN.
2. Cut the pressure line next to the rubber hose crimp (Refer to Figure 2).
3. Cut the metal section of the pressure line next to the bead in the line (Refer to Figure 2).
4. Install the 3/8" tube nut and sleeve onto the cut end of metal line.
NOTE:
SOME VEHICLES MAY HAVE A BLACK EPOXY COATING ON THE PRESSURE LINE. THIS COATING MUST BE REMOVED TO ALLOW THE TUBE NUT AND SLEEVE TO FIT ONTO THE LINE.
5. Install the drainback relief valve onto the metal line and tighten the tube nut/sleeve.
6. Install the rubber hose onto the drainback relief valve using the hose clamp to secure the valve in place. Tighten the hose clamp to 1 N-m (10 in.lbs.) torque.
NOTE:
THE DRAINBACK RELIEF VALVE IS IDENTIFIED WITH AN ARROW TO SHOW DIRECTION OF FLUID FLOW. INSTALL THE VALVE WITH THE ARROW POINTING TOWARDS THE TRANS. COOLER.
7. Using the quick connect removal tool, disconnect the return line connection at the transmission cooler (Figure 1).
8. Start the vehicle, place the gear selector in neutral and check for a steady flow of transmission fluid out of the return line. If no flow exists, the valve has been installed in the return line in error. Start at step 1 and repeat the installation procedure.
9. Connect the return line into the transmission. Make sure the line snaps into the fitting.
10. Remove any oil from the hose and valve. Start the vehicle and check for any leaks. Tighten the hose clamp and tube nut as required.
NOTE:
IF ANY TRANSMISSION MALFUNCTION CONTAMINATES THE FLUID, THE COOLER AND LINES MUST BE REVERSED FLUSHED THOROUGHLY. ON VEHICLES EQUIPPED WITH THE DRAINBACK RELIEF VALVE, THE VALVE MUST BE REMOVED AND DISCARDED BEFORE FLUSHING. REPLACE THE VALVE WITH A NEW ONE AFTER ALL REPAIRS ARE COMPLETED.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No. 21-25-10-90 0.5 Hrs.
FAILURE CODE: 53 - Improper Pressure