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-EMC (-)" procedure.

Signal circuit Inspection-EMC (-)

1. IG KEY : OFF.
2. 4WD ECM, EMC : Connect.
3. IG KEY : ON, Engine : ON.
4. Monitor signal waveform between EMC (-) terminal 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 "Signal circuit ground short Inspection-EMC (+)" procedure.

Signal circuit ground short Inspection-EMC (+)

1. Ignition OFF.
2. 4WD ECM : Connect, EMC connector : Disconnect.
3. Measure resistance between EMC (+) terminal of EMC harness connector and chassis ground.
A. Specification : Infinity

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) Go to "Signal circuit short Inspection-EMC (+,-)" procedure.
NO
1) Check for short to ground in EMC harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Signal circuit short Inspection-EMC (+,-)

1. Ignition OFF.
2. 4WD ECM : Connect, EMC : Disconnect.
3. Measure resistance between EMC (+) terminal of EMC harness connector and EMC (-) terminal of EMC harness connector.
A. Specification : Infinity