Code No.B1031, B1032: Air Thermo Sensor system


PROBABLE CAUSES






COMMENTS ON TROUBLE SYMPTOM
This code is set when the air thermo sensor circuit is short (Code No.B1031) or is open (Code No.B1032).

PROBABLE CAUSES

  • Malfunction of the air thermo sensor
  • Damaged the wiring harness or connectors
  • Malfunction of the A/C-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-110 A/C-ECU connector and C-119 air thermo sensor connector

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

STEP 2. Check the wiring harness between C-110 A/C-ECU connector (terminals 21 and 22) and C-119 air thermo sensor connector (terminals 2 and 1).

  • Check the sensor signal line and earth line for open or short circuit.

Q. Is the check result normal?
Go to Step 3.
Repair the wiring harness.

STEP 3. Check the air thermo sensor.
Refer to .

Q. Is the check result normal?
Go to Step 4.
Replace the air thermo sensor.

STEP 4. Check whether the diagnosis code is reset.

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