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Home >> Toyota >> 2009 >> Avalon XLS >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control >> Vehicle Stability Control System >> DTC C1251/51 Open in Pump Motor Circuit >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See CALIBRATION ).
  1. INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY) 
    1. Disconnect the skid control ECU connector.
      Fig 1: Identifying Skid Control ECU (GND Terminal Continuity)
      G05001568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

    Resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Specified Condition
    A34-1 (GND2) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT) 

    OK: Go to next step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY OPERATION) 
    1. Connect Techstream to the DLC3.
    2. Start the engine.
    3. Select "ACTIVE TEST" on Techstream.
    4. Check the operating sound of the ABS motor relay when operating it with Techstream.

    ACTIVE TEST: ABS/VSC/TRAC 

    ACTIVE TEST REFERENCE

    Item Vehicle Condition/Test Details Diagnostic Note
    ABS Motor 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. 

    NG: REPLACE ABS & TRACTION ACTUATOR ASSEMBLY 

    OK: Go to next step 

  3. RECONFIRM DTC 
    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 REFERENCE

    Result Proceed to
    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 assembly. Make sure that no DTCs are output.
    • If any DTCs are output while jiggling a connector or wire harness of the ABS & TRACTION actuator assembly, inspect and repair the connector or wire harness.

    HINT:

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

    B: REPLACE ABS & TRACTION ACTUATOR ASSEMBLY 

    A: END 

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