VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1257

DTC Code DTC Name
C1257 Power Supply Drive Circuit

DESCRIPTION

The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1257

Power Supply Drive Circuit

There is an open in the motor system circuit (motor input circuit).

Master cylinder solenoid (Skid control ECU)

CAUTION / NOTICE / HINT

Note:

When replacing the master cylinder solenoid, perform calibration (Click here).

PROCEDURE

  1. CHECK PUMP MOTOR OPERATION

    1. Turn the engine switch off.

    2. Disconnect the A7 skid control ECU connector.

    3. Depress the brake pedal more than 40 times.

    4. Turn the engine switch on (IG).

    5. Check pump motor operation.

      OK

      Pump motor operates normally.

      Result

      Result

      OK

      NG
    NG

    REPLACE MASTER CYLINDER SOLENO

    Click here

    OK

  2. RECONFIRM DTC

    1. Turn the engine switch off.

    2. Reconnect the A7 skid control ECU connector.

    3. Turn the engine switch on (IG).

    4. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    5. Check if the same DTC is output.

      Click here

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B

      Chassis > ABS/VSC/TRC > Trouble Codes

    A

    USE SIMULATION METHOD TO CHECK

    Click here

    B

    REPLACE MASTER CYLINDER SOLENOID

    Click here