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 Open Inspection" procedure.
Signal circuit Open Inspection
1. Ignition "OFF"
2. A/C-ECU, Water temp. sensor : Disconnect.
3. Measure resistance between Signal (+) terminal of Water temp. sensor harness connector and Signal (+) terminal of A/C-ECU harness connector.
A. Specification : 1 Ohm below




4. Is "resistance" display near the specified value ?
YES
1) Go to "Sensor ground circuit Open Inspection" procedure.
NO
1) Check for open in harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Sensor ground circuit Open Inspection
1. Ignition "OFF"
2. A/C-ECU, Water temp. sensor : Disconnect.
3. Measure resistance between Sensor ground (-) terminal of Water temp. sensor harness connector and Sensor ground (-) terminal of A/C-ECU harness connector.
A. Specification : 1 Ohm below




4. Is "resistance" display near the specified value ?
YES
1) Go to "Component inspection" procedure.
NO
1) Check for open in harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.