Transmission Control Module (TCM) Repair Procedures

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 1 Ω

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 (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, it is an intermittent problem (refer to "Inspection Procedure" in the "Basic Inspection Procedure" section).

Removal

1. 1
   Saving Oil Pressure Characteristics (TCM Replacement)

   

   

   

2. 2
   Turn the ignition off.
3. 3
   Disconnect the negative (-) battery cable.
4. 4
   Remove the air cleaner assembly and duct (refer to Engine Mechanical System - "Air Cleaner").
5. 5
   Disconnect the TCM connector (A).

   

6. 6
   Remove the wiring fixing clip (A).
7. 7
   Remove the TCM (B).

   

Installation

1. 1
   To install, reverse the removal procedure.
2. 2
   Entering Oil Pressure Characteristics (TCM Replacement)

   

   

   

3. 3
   Perform the ECM-related procedures after replacing the TCM (refer to Engine Control/Fuel System - "Engine Control Module").
4. 4
   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").