W/Harness Inspection

Power Supply Circuit Inspection

1. Ignition "OFF"
2. Disconnect A/C pressure sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 3 of the A/C pressure sensor harness connector and chassis ground
A. Specification: Approx. 5V




5. Is voltage within the specification ?
YES
1) Go to next step as below.
NO
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure

Ground Circuit inspection

1. Ignition "OFF"
2. Measure resistance between terminal 1 of the A/C pressure sensor harness connector and chassis ground
A. Specification: Approx. 0 Ohm




3. Is resistance within the specification ?
YES
1) Go to next step as below.
NO
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure

Signal Circuit Inspection

1. Check for short to ground in signal circuit
(1) Measure resistance between terminal 2 of the A/C pressure sensor harness connector and chassis ground
A. Specification: Infinite




(2) Is resistance within the specification ?
YES
1) Go to next step as below.
NO
1) Check for short to ground in signal circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure
2. Check for open in signal circuit
(1) Measure resistance between terminals 2 of the A/C pressure sensor harness connector and 35 of the ECM harness connector
A. Specification: Approx. 0 Ohm




(2) Is resistance within the specification ?
YES
1) Go to next step as below.
NO
1) Check for open in signal circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) 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 Component Inspection