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.
A. Specification : Approx. 110 - 130 ohms




4. Is resistance within the specification ?
YES
1) Go to next step as below
NO
1) Check for open in wiring related to the CAN communication (ECM, EPS, MTS and vertical resistor at the junction box). Repair as necessary and then go to "Verification of Vehicle Repair" procedure

CAUTION: Vertical Resistor Resistance : Approx. 110 - 130 ohms

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.
A. Specification : Infinite (above 10 Kohms.)




3. Is resistance within the specification ?
YES
1) Go to next step as below
NO
1) Repair CAN communication line for a short to ground. And then go to "Verification of Vehicle Repair" procedure

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.
A. Specification : Approx. 0V




5. Is voltage within the specification ?
YES
1) Go to next step as below
NO
1) Repair CAN communication line for a short to battery. And then go to "Verification of Vehicle Repair" procedure

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 ?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
1) Go to next step as below