Posted in Mitsubishi Colt

Code No.C1200 – Abnormality in FR wheel speed sensor circuit MMC Colt

 Posted by  Posted on September 27, 2020

OPERATION

  • The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which north and south pole sides of the magnets are arranged alternately) for detecting the wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This sensor outputs frequency pulse signals in proportion to the wheel speed.
  • The pulse signals, which the wheel speed sensor creates, are sent to ABS-ECU. ABS-ECU uses the frequency of the pulse signals to determine the wheel speed.

    • DIAGNOSIS CODE SET CONDITIONS

    PROBABLE CAUSES

  • Damaged wiring harness and connectors
  • Noise interference
  • Malfunction of wheel speed sensor
  • ABS-ECU malfunction

    • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III CAN bus diagnosis

    Q. Is the check result normal?

    STEP 2. Diagnosis code recheck after resetting CAN bus lines

    Q. Is the diagnosis code No.C1200 set?

    STEP 3. M.U.T.-III data list

  • Item No.02: FR wheel speed sensor

    • Q. Is the check result normal?

    STEP 4. Voltage measurement at the A-05 ABS-ECU connector

    Q. Is the check result normal?

    STEP 5. Resistance measurement at A-05 ABS-ECU connector

    Q. Is the check result normal?

    STEP 6. Connector check: A-05 ABS-ECU connector, A-02 front wheel speed sensor <RH> connector

    Q. Is the check result normal?

    STEP 7. Wiring harness check between A-05 ABS-ECU connector terminal No.7 and A-02 front wheel speed sensor <RH> connector terminal No.2, and between A-05 ABS-ECU connector terminal No.6 and A-02 front wheel speed sensor <RH> connector terminal No.1.

  • Check for short circuit in front wheel speed sensor <RH> circuit

    • Q. Is the check result normal?

    STEP 8. Voltage measurement at the A-05 ABS-ECU connector

    Q. Is the check result normal?

    STEP 9. Wiring harness check between A-05 ABS-ECU connector terminal No.7 and A-02 front wheel speed sensor <RH> connector terminal No.2, and between A-05 ABS-ECU connector terminal No.6 and A-02 front wheel speed sensor <RH> connector terminal No.1.

  • Check for open circuit in front wheel speed sensor <RH> circuit.

    • Q. Is the check result normal?

    STEP 10. Check for wheel speed sensor <FR> as a single unit

    Q. Is the check result normal?

    STEP 11. Connector check: A-05 ABS-ECU connector, A-02 front wheel speed sensor <RH> connector

    Q. Is the check result normal?

    STEP 12. Check whether the diagnosis code is reset.

    Q. Is the diagnosis code No.C1200 set?

    STEP 13. Check whether the diagnosis code is reset.

    Q. Is the diagnosis code No.C1200 set?

    Author: admin