Transmission Control Module (TCM) Repair Procedures

Replacement

1. 1
   Turn the ignition off.
2. 2
   Disconnect the negative (-) battery cable.
3. 3
   Remove the battery. (Refer to Engine Electrical System - "Battery")
4. 4
   Disconnect the TCM extension connector (A).

   

5. 5
   Remove the TCM (A) by removing the mounting bolts and nuts. TCM mounting bolt/nut: 9.8 ~ 11.8 N·m

   

Inspection

1. 1
   TCM GROUND CIRCUIT INSPECTION: Measure the resistance between the TCM and chassis ground using the rear side of the TCM harness connector as the TCM side test point. If a problem is found, repair it.

   Specification: Below 1x

2. 2
   TCM CONNECTOR INSPECTION: Disconnect the TCM connector and visually inspect the ground terminals on the TCM side and harness side for bent pins or poor contact pressure. If a problem is found, repair it.
3. 3
   If no problem is found in steps 1 and 2, the TCM may be faulty. If so, before replacing the TCM, make sure there are no DTCs, then replace the TCM with a new one and recheck the vehicle. If DTCs were detected, check them first before replacing the TCM.
4. 4
   RECHECK ORIGINAL TCM: Install the original TCM (which may be faulty) into a known good vehicle and check the vehicle. If the problem recurs, replace the original TCM with a new one. If the problem does not occur, the problem is intermittent (refer to the "Problem Verification Procedure" in the "Basic Diagnostic Procedure" section).

Installation

1. Install in the reverse order of removal.

   For vehicles equipped with an immobilizer or push-button engine start system, perform the "Key Learning" procedure together. (Refer to Body Electrical System - "Immobilizer System") Perform TCM learning after replacing the transmission to prevent slow shift response, acceleration jerk, and start jerk (refer to "Automatic Transmission Control System - Repair Procedures").