Engine Control Module (ECM): Inspection

WARNING:

When working on the high voltage system, the work should be performed by technicians who have completed the relevant training. A lack of understanding of the high voltage system can lead to serious accidents due to electric shock or short circuit.
When working on the high voltage system or related components, be sure to observe and be aware of the "HIGH VOLTAGE SYSTEM GENERAL SAFETY INFORMATION AND CAUTION ". If not, it may cause serious accidents due to electric shock or short circuit.
When working on the high voltage system, make sure to check the Personal Protective Equipment (PPE) and high voltage shut-off procedure.

TEST Engine Control Module (ECM) GROUND CIRCUIT: Measure resistance between ECM and chassis ground using the backside of ECM harness connector as ECM side check point. If the problem is found, repair it.
Specified value: 1Ω or less
TEST ECM CONNECTOR: Disconnect the ECM connector and visually check the ground terminals on ECM 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 ECM could be faulty. If so, replace the ECM with a new one, and then check the vehicle again. If the vehicle operates normally then the problem was likely with the ECM.
RE-TEST THE ORIGINAL ECM: Install the original ECM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original ECM with a new one. If problem does not occur, this is intermittent problem (Refer to Intermittent Problem Procedure in Basic Inspection Procedure)