TEST TCM GROUND CIRCUIT: Measure resistance between TCM and chassis ground using the backside of TCM harness connector as TCM side check point. If the problem is found, repair it.

TEST TCM CONNECTOR: Disconnect the TCM connector and visually check the ground terminals on TCM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.

If problem is not found in Step 1 and 2, the TCM could be faulty. If so, make sure there were no DTC's before swapping the TCM with a new one, and then check the vehicle again. If DTC's were found, examine this first before swapping TCM.

RE-TEST THE ORIGINAL TCM: Install the original TCM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original TCM with a new one. If problem does not occur, this is intermittent problem.

Turn ignition switch OFF.

Remove the air cleaner assembly.

(Refer to Engine Mechanical System - "Air cleaner")

Remove the battery.

(Refer to Engine Electrical System - "Battery")

Disconnect the TCM connector (A).

Remove the TCM (B) after removing the bolts and nut.

Install in the reverse order of removal.