Repair Procedure

This bulletin involves tightening the four screws holding the case of the Powertrain Control Module (PCM) to ensure complete grounding. If the ground is incomplete, the signal to the tachometer is momentarily interrupted.

1. Disconnect the negative and positive cables from the battery.

2. Remove the washer bottle neck.

3. Squeeze the tabs on the Power Distribution Center (PDC) while pulling up to remove the PDC from the mounting bracket. Lay the PDC aside to gain access to the PCM bracket screws.

4. Remove the three screws attaching the PCM to the body.

5. Lift the PCM up and disconnect the two 40-way connectors.

6. Remove the PCM.

7. Turn the PCM over to the back side. Torque the four screws (at each corner) to 6.8 Nm (60 in. lbs.) using a manual torque wrench.

8. Attach the two 40-way connectors to the PCM.

9. Install the PCM. Torque the mounting screws to 9 Nm (80 in. lbs.).

10. Install the PDC by pushing it down into the brackets.

11. Install the washer bottle neck.

12. Connect the positive and negative battery cables.

13. Using an ohmmeter, check the resistance between the PCM case and the battery ground. If the resistance is less than 1 ohm, the repair is complete.

14. If the resistance is above 1 ohm, remove the PCM and perform the following steps:

A. Remove one PCM corner screw at a time, then insert back into the hole, and torque to 6.8 Nm (60 in. lbs.). This will work the screw through the paint creating a better ground.

B. Repeat for remaining three screws.