Posted in Mitsubishi Colt

B1090, B1091 – Motor drive system for air mix damper MMC Colt

 Posted by  Posted on September 28, 2020

COMMENTS ON TROUBLE SYMPTOM

PROBABLE CAUSE

  • Malfunction of the front air mixing damper control motor and potentiometer
  • Malfunction of the semi automatic air conditioner control panel (A/C-ECU)
  • Damaged wiring harness or connectors

    • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III actuator test

  • Item 43: Air mix dumper motor: 100%
  • Item 42: Air mix dumper motor: 0%

    • Q. Is the check result normal?

    STEP 2. Connector check: B-113 A/C-ECU connector and B-12 air mixing damper control motor and potentiometer connector

    Q. Is the check result normal?

    STEP 3. Check the wiring harness between B-113 A/C-ECU connector (terminals 13,15 and 12) and B-12 air mixing damper control motor and potentiometer connector (terminals 4,3 and 5) <LHD> or (terminals 1,5 and 4) <RHD>.

  • Check the motor activating lines for open and short circuit.

    • Q. Is the check result normal?

    STEP 4. Check the air mixing damper control motor and potentiometer.

    Q. Is the check result normal?

    STEP 5. Check whether the diagnosis code is reset.

    Q. Is the diagnosis code set?

    Author: admin