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Home >> Toyota >> 2003 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 768 (Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics)) >> DTC C1257/57: Power Supply Drive Circuit Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota 4Runner. 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 PUMP MOTOR OPERATION 
    1. Turn the ignition switch off.
    2. Disconnect the skid control ECU (S28) connector.
    3. Depress the brake pedal more than 20 times.
    4. Check pump motor operation.

      OK: 

      Pump motor normally operates. 

    1. NG: REPLACE MASTER CYLINDER SOLENOID (SEE  OVERHAUL  ) 
    2. OK: GO TO NEXT STEP 
  2. RECONFIRM DTC 
    1. Turn the ignition switch off.
    2. Reconnect the skid control ECU (S28) connector.
    3. Turn the ignition switch to the ON position.
    4. Clear the DTC (see DTC CHECK/CLEAR  ).
    5. Check if the same DTC is detected (see DTC CHECK/CLEAR  ).

      Results: 

      RESULT DESCRIPTION

      DTC is output A
      DTC is not output B
    1. B: END 
    2. A: REPLACE MASTER CYLINDER SOLENOID (SEE  OVERHAUL  ) 
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