INSPECTION PROCEDURE 12: A/C pressure sensor system


PROBABLE CAUSES








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

PROBABLE CAUSES

  • Malfunction of A/C pressure sensor
  • Malfunction of A/C-ECU
  • Wiring harness or connector failure

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: A-49 A/C pressure sensor connector

Q. Is the check result normal?
Go to Step 2.
Repair the connector concerned.

STEP 2. Inspection of the A/C pressure sensor
Refer to .

Q. Is the A/C pressure sensor normal?
Go to Step 3.
Replace the A/C pressure sensor.

STEP 3. Connector check: C-111 A/C-ECU connector

Q. Is the check result normal?
Go to Step 4.
Repair the connector concerned.

STEP 4. Check the wiring harness wires between A-49 A/C pressure sensor connector (terminals 3, 2 and 1) and C-111 A/C-ECU connector (terminals 20, 16 and 19).

  • Check the input line for open circuit.
note Prior to the wiring harness inspection, check intermediate connector C-37, and repair if necessary.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.

STEP 5. 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 A/C-ECU.