Inspection/Repair - W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






CAN Signal Circuit Inspection

Check CAN communication line for open
1. Ignition "OFF" & Engine "OFF".
2. Disconnect ECM/TCU/4WD connector and HECU connector.
3. Measure resistance between CAN-High terminal of ECM/TCM/4WD harness connector and CAN-High terminal of HECU harness connector.
4. Measure resistance between CAN-Low terminal of ECM/TCM/4WD harness connector and CAN-Low terminal of HECU harness connector.

Specification : Approx. below 1 Ohm









5. Is the measured resistance within specifications?





Check CAN communication line for short
1. Ignition "OFF" & Engine "OFF".
2. Disconnect ECM/TCM/4WD connector and HECU connector.
3. Measure resistance between CAN-High terminal of ECM/TCM/4WD harness connector and chassis ground.
4. Measure resistance between CAN-Low terminal of ECM/TCM/4WD harness connector and chassis ground.
5. Measure resistance between CAN-High terminal and CAN-Low of ECM/TCM/4WD harness connector.

Specification : Infinite (Infinity Ohms)









6. Is the measured resistance within specifications?