B1021, B1022 – Air thermo sensor system MMC Colt



COMMENTS ON TROUBLE SYMPTOM


PROBABLE CAUSE

  • Malfunction of the air thermo sensor
  • Damaged wiring harness or connectors
  • Malfunction of the semi automatic air conditioner control panel (A/C-ECU)

  • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III data list

  • Item 20: Air thermo sensor
  • Q. Is the check result normal?

    STEP 2. Connector check: B-113 A/C-ECU connector and B-08 air thermo sensor connector

    Q. Is the check result normal?

    STEP 3. Check the wiring harness between B-113 A/C-ECU connector (terminals 12 and 14) and B-08 air thermo sensor connector (terminals 2 and 1).

  • Check the sensor signal line and earth line for open and short circuit.
  • Q. Is the check result normal?

    STEP 4. Check the air thermo sensor.

    Q. Is the check result normal?

    STEP 5. Check whether the diagnosis code is reset.

    Q. Is the diagnosis code set?

    Author: admin