ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1251/51

DTC Code DTC Name
C1251/51 Open in Pump Motor Circuit

DESCRIPTION

DTC No. DTC Detecting Condition Trouble Area
C1251/51 When the ABS actuator pump drive motor is not operating normally.

  • ABS pump motor circuit

  • ABS pump motor

WIRING DIAGRAM

A01KFFQE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT BRAKE ACTUATOR ASSEMBLY (PUMP MOTOR OPERATION)


    1. A01KIN7E01

      Disconnect the connector (A4) from the brake actuator.

    2. Connect the positive (+) lead from the battery to BM (2) terminal and negative (-) lead to GND (1) terminal of the brake actuator, check that the pump motor is operated.

      OK
      The running sound of the pump motor should be heard.

    NG

    CHECK AND REPLACE BRAKE ACTUATOR ASSEMBLY

    OK

  2. CHECK HARNESS AND CONNECTOR (ABS MOTOR RELAY - BRAKE ACTUATOR - SKID CONTROL ECU)


    1. Check for open and short circuit in harness and connector between ABS motor relay, brake actuator and skid control ECU Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK CONTINUITY (GND OF BRAKE ACTUATOR - BODY GROUND)

    A01KEHDE01

    1. Measure resistance between terminals GND (A4 - 1) of brake actuator connector and body ground.

      OK
      Resistance: 1 Ω or less

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK AND REPLACE SKID CONTROL ECU ASSEMBLY