INSPECTION PROCEDURE 6: A/C pressure sensor system


COMMENTS ON TROUBLE SYMPTOM
If the A/C pressure sensor system is defective, the wiring harness between the A/C pressure sensor and the engine-ECU is suspected.

PROBABLE CAUSES

  • Malfunction of the A/C pressure sensor
  • Malfunction of the engine-ECU
  • Damaged wiring harness or connectors

DIAGNOSIS PROCEDURE

STEP 1. Inspection of the A/C pressure sensor
Refer to .

Q. Is the A/C pressure sensor normal?
Go to Step 2.
Replace the A/C pressure sensor.

STEP 2. Check open circuit in AC/P, BVSE&ACPE and BVS5 & ACP5 line between A/C pressure sensor connector and engine-ECU connector.

Q. Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.

STEP 3. Check the data list below on the M.U.T.-III.
All the following items in the data list should be normal.
Item No.61: Pressure sensor

Q. Is the check result normal?
Go to Step 4.
Replace the engine-ECU.

STEP 4. Retest the system.

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the engine-ECU.