W/Harness Inspection

B1202 Heater Water Temperature Sensor Open (High)

Inspection/Repair - W/Harness Inspection

Terminal & 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?






Signal Circuit Inspection

Check power in harness
1. Ignition "OFF".
2. Disconnect Water temp. sensor and Connect A/C control unit main harness connector.
3. Ignition "ON".
4. Measure voltage between Power terminal of Water temp. sensor harness connector and chassis ground.

Specification : 0 V




5. Is the measured voltage within specification?





Check for open in harness
1. Ignition "OFF".
2. Disconnect Water temp. sensor and A/C control unit main harness connector.
3. Measure resistance between Signal (+) terminal of Water temp. sensor harness connector and Signal (+) terminal of A/C-ECU harness connector.

Specification : 1 Ohms below




4. Is the measured resistance within specification?