W/Harness Inspection

Check CAN Communication Line for Open

1. Ignition "OFF".
2. Disconnect ECM harness connector.
3. Measure resistance between terminals 77 and 78 of the ECM harness connector.

Specification : Approx. 110 - 130 Ohms




4. Is resistance within the specification ?






Check CAN Communication Line for Short to Ground

1. Measure resistance between terminal 77 of the ECM harness connector and chassis ground.
2. Measure resistance between terminal 78 of the ECM harness connector and chassis ground.

Specification : Infinite (above 10 kohms)




3. Is resistance within the specification ?






Check CAN Communication Line for Short to Battery

1. Disconnect the connectors related to the CAN communication.
2. Ignition "ON" & Engine "OFF".
3. Measure voltage between terminal 77 of the ECM harness connector and chassis ground.
4. Measure voltage between terminal 78 of the ECM harness connector and chassis ground.

Specification : Approx. 0V




5. Is voltage within the specification ?






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 ?