Repair Procedure
Perform This Procedure To Replace The PCM Ground Wire Only:1. If not already performed, turn the ignition switch to the off position. Remove and isolate the negative battery cable from the battery.
2. Remove and discard the old ground nut used to attach the ground wire ring terminal to the vehicle body (Fig. 1).
3. Remove the C4 connector (38-way) from the PCM (if not already removed).
4. Remove the plastic cover used to protect the wires from the back of the C4 connector
5. Locate the two ground wires and terminals (pins # 12 and # 13) in the C4 connector (Fig. 2).
6. Release the red latch on the C4 connector used to secure the connector wire terminals (Fig. 3).
7. Insert the terminal pin removal tool into pin # 12 cavity and remove pin # 12 ground wire terminal from the C4 connector.
8. Insert the terminal pin removal tool into pin # 13 cavity and remove pin # 13 ground wire terminal from the C4 connector.
9. Cut and tape back, so as to isolate, the old PCM ground wires at the PCM and ground stud.
10. Install the two new ground wire terminals into cavities # 12 and # 13 of the C4 connector. Either terminal can go into either cavity.
11. Lock the red latch on the C4 connector to secure the connector wire terminals.
12. Install the new plastic cover to the back of the C4 connector.
13. Tape the C4 connector wires to the new plastic cover.
14. Clean the connection between the PCM and the C4 connector of any moisture.
15. Route the new ground wire along the engine compartment harness, and then to its body ground stud.
16. Without the ground ring terminal in place, install the new ground nut to vehicle body ground stud. Tighten the nut to 14.7 Nm (130 in. lbs.). Remove the new ground nut from the ground stud.
17. Install the new ground wire ring terminal to the vehicle body ground stud. Position the wire crimp section of the ground ring terminal so that when fully tightened the wire crimp when viewed is pointing to the 3 o'clock position (towards the left fender) (Fig. 1).
18. Install the new ground nut and tighten the nut to 14.7 Nm (130 in. lbs.).
19. Verify that the seal used to seal the C4 connector to PCM is positioned correctly.
20. Install the C4 connector to the PCM.
21. Secure the ground wire to the engine compartment harness with plastic tie wraps.
22. Partially remove the left side of the cowl edge weather-strip seal and verify that the left cowl grill push pin is fully seated. Install the cowl grill weather-strip seal (Fig. 1).
23. Verify proper wiring repair.
24. Check all transmission electrical connections for moisture. Clean connections as required.
25. Connect the negative battery cable to the battery. Set the clock to the correct time.
26. Using the scan tool (DRBIII(R)) erase any DTC's that may be present.
27. Verify correct transmission operation.
Perform This Procedure To Replace The PCM C4 Connector With New Ground Wire:
1. If not already performed, turn the ignition switch to the off position. Remove and isolate the negative battery cable from the battery.
2. Remove and discard the old ground nut used to attach the ground wire ring terminal to the vehicle body (Fig. 1).
3. Cut and tape back, so as to isolate, the old ground wires at the ground stud.
4. Remove the C4 connector (38-way) from the PCM (if not already removed).
5. Remove the old plastic cover used to protect the wires from the back of the C4 connector
6. To prevent error, each C4 connector wire should be cut, spliced, and shrink wrapped one wire at a time. When wires are cut from the OLD C4 connector make sure that the wires are cut as close to the back of the old C4 connector as possible. This will allow for wire splices to be staggered along the electrical wire harness (preferred) versus all splices occurring at the same location in the wire harness. The original convolute will be reused. Each wire in the C4 connector is color coded to match the wires from the wire harness.
7. Repairing one wire at a time, cut and trim the wire ends on the new C4 connector wire and on the original harness wire. Slide the heat shrink wrap sleeve onto the wire. Using a splice band and crimping tool splice the wire ends together. Solder the splice. Using a heat gun position (center) the shrink wrap sleeve over the wire splice and apply heat to the shrink wrap sleeve. If necessary, refer to detailed splice procedures available on DealerCONNECT under the "Service Info" tab - 8-Electrical / Wiring Diagram Information / Wire / Standard Procedure / Wire Splicing (Fig. 4).
8. Complete the wire splice process for the remaining C4 connector wires.
9. Verify that the red latch on the C4 connector used to secure the connector wire terminals is in its locked position.
10. Install the new plastic cover to the back of the C4 connector.
11. Tape the C4 connector wires to the new plastic cover.
12. Tape the wire harness from the C4 connector and install original convolute tubing over repaired harness.
13. Clean the connection between the PCM and the C4 connector of any moisture.
14. Route the new ground wire along the engine compartment harness, and then to its body ground stud.
15. Without the ground ring terminal in place, install the new ground nut to vehicle body ground stud. Tighten the nut to 14.7 Nm (130 in. lbs.). Remove the new ground nut from the ground stud.
16. Install the new ground wire ring terminal to the vehicle body ground stud. Position the wire crimp section of the ground ring terminal so that when fully tightened the wire crimp when viewed is pointing to the 3 o'clock position (towards the left fender) (Fig. 1).
17. Install the new ground nut and tighten the nut to 14.7 Nm (130 in. lbs.).
18. Verify that the seal used to seal the C4 connector to PCM connection is positioned correctly.
19. Install the C4 connector to the PCM.
20. Secure the ground wire to the engine compartment harness with plastic tie wraps.
21. Partially remove the left side of the cowl edge weather-strip seal and verify that the left cowl grill push pin is fully seated. Install the cowl edge weather-strip seal (Fig. 1).
22. Verify proper wiring repair.
23. Check all transmission electrical connections for moisture. Clean connections as required.
24. Connect the negative battery cable to the battery. Set the clock to the correct time.
25. Using the scan tool (DRBIII(R)) erase any DTC's that may be present.
26. Verify correct transmission operation.