W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness 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 "Signal circuit Inspection-CAN" procedure.

Signal circuit Inspection-CAN

1. IG KEY : OFF.
2. 4WD ECM, EMC connector : Connect.
3. IG KEY : ON, Engine : ON.
4. Monitor signal waveform between CAN (HIGH, LOW) of "4WD-ECM" harness connector and chassis ground.
5. Start and drive vehicle in gear and maintain vehicle speed is approx. 10 km/h or less (6 mph or less)
A. Specification : Signal Waveform & Data





CAUTION: The above value is only for reference. The actual value may differ from it according to various engine condition.

6. Is "Signal display" near the specified value ?
YES
1) Fault is intermittent caused by poor contact in the sensor's and/or "4WD-ECM"s connector or was repaired and "4WD-ECM" memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure
NO
1) Go to "CAN comm. Line Inspection (Open/Short)" procedure.

CAN comm. Line Inspection (Open/Short)

1. Ignition OFF.
2. 4WD ECM : Disconnect.
3. Measure resistance between CAN (HIGH) terminal of 4WD ECM harness connector and CAN (LOW) terminal of 4WD ECM harness connector.
A. Specification : Approx. 60 Ohms





CAUTION: The above value is only for reference. The actual value may differ from it according to various engine condition.

4. Is "resistance" display near the specified value ?
YES
1) Fault is intermittent caused by open or short in CAN signal harnesses was repaired and "4WD-ECM" memory was not cleared. Go to the applicable troubleshooting procedure.
NO
1) Check for open or short in TCCU communication circuit.
2) Check HECU (VDC) or their signal.
3) Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.