W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. 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?






Signal Circuit Inspection

1. Ignition "OFF".
2. Disconnect the HECU harness connector.
3. Measure resistance between terminal "14" of the HECU harness connector and terminal "35" of the HECU harness connector.

Specification : Approx. 60 Ohms




4. Is the measured resistance within specifications?






CAN Bus Short (to ground) Inspection

1. Ignition "OFF".
2. Disconnect the HECU harness connector.
3. Measure resistance between terminal "14, 35" of the HECU harness connector and chassis ground.

Specification : Approx. Infinity Ohms




4. Is the measured resistance within specifications?






CAN Bus Short (to battery) Inspection

1. Ignition "OFF".
2. Disconnect the HECU harness connector.
3. Ignition "ON" & Engine "OFF".
4. Measure voltage between terminal "14, 35" of the HECU harness connector and chassis ground.

Specification : Below. 0.2V




5. Is the measured resistance within specifications?






CAN Bus Short (between HIGH and LOW) Inspection

1. Ignition "OFF".
2. Disconnect all the connector related to CAN such as HECU, PCU, EPS, ECS harness connector.
3. Ignition "ON" & Engine "OFF".
4. Measure resistance between terminal "14,35" of the HECU harness.

Specification : Approx. 120 Ohms




5. Is the measured resistance within specifications?