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 Short Inspection" procedure.
Signal circuit Short 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 : Infinity








FIG. 1) ** Specifications : Resistance value of water temp sensor as a function of temperature.
** The actual value may differ from it according to various engine condition.
4. Is "resistance" display near the specified value ?
YES
1) Go to "Sensor ground circuit Open Inspection" procedure.
NO
1) Check for short to ground in harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.