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Home >> Toyota >> 2005 >> Avalon XLS >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics) >> DTC C1251/51: Pump Motor Circuit Malfunction >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the ABS & TRACTION actuator assy, perform zero point calibration (see CALIBRATION  ).
  1. INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY) 
    1. Disconnect the skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 1: Identifying Skid Control ECU Connector Terminal GND2
    G02976618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Specified Condition
    A34-1 (GND2) - Body ground Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT) 
    2. OK: Go to next step. 
  2. PERFORM ACTIVE TEST BY HAND HELD TESTER (ABS MOTOR RELAY OPERATION) 
    1. Connect the hand held tester to the DLC3.
    2. Start the engine.
    3. Select "ACTIVE TEST" on the hand held tester.
    4. Check the operating sound of the ABS motor relay when operating it with the hand held tester.

    ACTIVE TEST: ABS/VSC 

    ACTIVE TEST - ABS/VSC

    Item Vehicle Condition/Test Details Diagnostic Note
    ABS MOT RELAY Turns ABS motor relay ON or OFF Operating sound of relay (clicking sound) is heard

    OK: 

    The operating sound of the ABS motor relay is heard. 

    1. NG: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE  REPLACEMENT  ) 
    2. OK: Go to next step. 
  3. RECONFIRM DTC (SEE  DTC CHECK/CLEAR   ) 
    1. Clear the DTC.
    2. Start the engine.
    3. Drive the vehicle at the speed of 4.3 mph (7 km/h) or more.
    4. Check that the same DTC is recorded.

    HINT:

    Reinstall the sensors, connectors, etc. and restore the vehicle to its prior conditions before rechecking for DTCs.

    Result: 

    RESULT

    DTC is not output A
    DTC is output B

    HINT:

    • If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the ignition switch on (IG) and the stop light switch OFF, the ECU performs self diagnosis of the motor and solenoid circuits.
    • If a normal system code is output (trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the ABS & TRACTION actuator assy. Make sure that no DTCs are output.
    • If any DTCs are output while jiggling a connector or wire harness of the ABS & TRACTION actuator assy, inspect and repair the connector or wire harness.
    1. B: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE  REPLACEMENT  ) 
    2. A: END 

    HINT:

    It is suspected that the DTCs were output due to a bad connection of the connector terminal.

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