W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. 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
- Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
- Go to" Power Circuit Inspection" procedure.

Power Supply 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.
A. Specification : approx. 5V




5. Is the measured voltage within specification ?
YES
- Go to "Ground circuit inspection" procedure.
NO
- Repair Open in power circuit and go to "Verification of Vehicle Repair" procedure.

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








6. Is the measured voltage within specification ?
YES
- Go to "Signal circuit inspection" procedure.
NO
- Repair as necessary and go to "Verification of Vehicle Repair" procedure.

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.
A. Specification : Approx. 0V




(5) Is the measured voltage within specification ?
YES
- Go to "Component inspection" procedure.
NO
- Go to "Check short to battery in harness" procedure.
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.
A. Specification : Infinite Ohms




(4) Is the measured resistance within specification ?
YES
- Go to "Component inspection" procedure.
NO
- Repair Short in signal circuit and go to "Verification of Vehicle Repair" procedure.