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Home >> Toyota >> 2004 >> Tundra Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 471 (Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics)) >> Abs With EBD & BA & TRAC & VSC System >> Circuit Inspection >> DTC C1257/57: Power Supply Drive Circuit Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Tundra and 2005 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When replacing the master cylinder solenoid, perform zero point CALIBRATION  .
  1. Check the operation of the hydraulic brake booster pump motor. 

    PREPARATION: 

    1. Turn the ignition switch OFF.
    2. Disconnect the skid control ECU connector (S29).
    3. Depress the brake pedal more than 20 times.

    CHECK: 

    Check hydraulic brake booster pump motor operation.

    OK: 

    Hydraulic brake booster pump normally operates. 

    1. NG : Replace master cylinder solenoid (See  DISASSEMBLY  ). 
    2. OK : Go to next step. 
  2. Reconfirm DTC (See  DTC CHECK / CLEAR   ). 

    PREPARATION: 

    1. Turn the ignition switch OFF.
    2. Reconnect the skid control ECU connector (S29).
    3. Turn the ignition switch to the ON position.
    4. Clear the DTCs.

    CHECK: 

    Check if the same DTCs are detected.

    RESULT: 

    DTC OUTPUT RESULT

    DTC is output A
    DTC is not output B
    1. B : END. 
    2. A : Replace master cylinder solenoid (See  DTC CHECK / CLEAR   ).