Inspection Procedure 20: A/C pressure sensor system <LHD>

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

PROBABLE CAUSES

  • Malfunction of A/C pressure sensor
  • Malfunction of the A/C-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check that the following service data display contents are normal. (Refer to .)

  • Item 04: Pressure sensor

Q. Is the check result normal?
Go to Step 6.
Go to Step 2.

STEP 2. Connector check: A-37 A/C pressure sensor connector

Q. Is the check result normal?

Go to Step 3.

Repair the connector.

STEP 3. Inspection of A/C pressure sensor
Refer to .

Q. Is the check result normal?
Go to Step 4.
Replace the A/C pressure sensor.

STEP 4. Connector check: C-106 A/C-ECU connector

Q. Is the check result normal?

Go to Step 5.

Repair the connector.

STEP 5. Check the wiring harness between A-37 A/C pressure sensor connector (terminals 2, 1 and 3) and C-106 A/C-ECU connector (terminals 25, 14 and 1).


note Prior to the wiring harness inspection, check intermediate connector C-125 and joint connector C-01, and repair if necessary.

  • Check the input line for open circuit.

Q. Is the check result normal?

Go to Step 6.

Repair the wiring harness.

STEP 6. Recheck the trouble symptom

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
Replace the A/C-ECU.