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 ?






Power Circuit Inspection

1. IG Key "OFF".
2. Disconnect the A/C pressure sensor connector.
3. IG Key "ON".
4. Measure the voltage between terminal 3 of A/C pressure sensor harness connector and chassis ground.

Specification : 5V





5. Is the measured voltage within specification ?






Ground Circuit inspection

1. IG Key "OFF".
2. Disconnect the A/C pressure sensor connector.
3. IG Key "ON".
4. Measure the voltage between terminal 3 of A/C pressure sensor harness connector and chassis ground. (Fig A)
5. Measure the voltage between terminal 3 and terminal 1 of A/C pressure sensor harness connector. (Fig B)

Specification : The Difference between "A" and "B" is below 200 mV.





6. Is the measured voltage within specification ?






Signal Circuit Inspection

1. Voltage inspection
(1) IG Key "OFF".
(2) Disconnect the A/C pressure sensor connector.
(3) IG Key "ON".
(4) Measure the voltage between terminal 2 of A/C pressure sensor harness connector and chassis ground.

Specification : Approx. 0V





(5) Is the measured voltage within specification ?





2. Check short to battery in harness
(1) IG Key "OFF".
(2) Disconnect A/C pressure sensor connector and PCM connector.
(3) Measure the resistance between terminal 2 and terminal 3 of A/C pressure sensor harness connector.

Specification : Infinite





(4) Is the measured resistance within specification ?