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Home >> Lexus >> 2004 >> RX 330 FWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> DTC C1251/51: Pump Motor Is Locked/Open Circuit In Pump Motor Ground >> Inspection Procedure

Inspection Procedure

  1. CHECK OPERATION OF BRAKE ACTUATOR (PUMP MOTOR) 
    1. Disconnect the skid control ECU connector S1.
    2. Fig 1: Identifying Skid Control ECU Connector
      G01396069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect the positive (+) lead to the terminal BM and negative (-) lead to the terminal GND2 of the skid control ECU. Check that the pump motor is operated.

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

    NG: REPLACE ABS & TRACTION ACTUATOR ASSY (See  REPLACEMENT  ) 

    OK: GO TO NEXT STEP. 

  2. INSPECT HARNESS AND CONNECTOR (GND2 OF SKID CONTROL ECU AND BODY GROUND) 
  1. Disconnect the skid control ECU connector S1.
  2. Fig 2: Identifying Skid Control ECU Connector
    G01396071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Measure the resistance according to the value(s) in Fig 3 .

    Standard: 

    Fig 3: Resistance Standard Table
    G01396070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ABS & TRACTION ACTUATOR ASSY (See  REPLACEMENT  )