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 "Signal circuit inspection" procedure.
NO
- Repair Open or Short to ground in A/C pressure sensor power circuit and go to "Verification of Vehicle Repair" procedure.

Signal Circuit Inspection

1. Check short to ground inspection
(1) IG Key "OFF".
(2) Disconnect A/C pressure sensor and PCM connector.
(3) Measure the resistance between terminal 2 of A/C pressure sensor harness connector and chassis ground.
A. Specification : Infinite Ohms




(4) Is the measured resistance within specification ?
YES
- Go to "Check open in harness" procedure.
NO
- Repair Short to ground in A/C pressure sensor signal circuit and go to "Verification of Vehicle Repair" procedure.
2. Check open in harness
(1) IG Key "OFF".
(2) Disconnect A/C pressure sensor and PCM connector.
(3) Measure the resistance between terminal 2 of A/C pressure sensor harness connector and terminal 32 of PCM harness connector.
A. Specification : Approx. below 1 Ohm




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