VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1428

DTC Code DTC Name
C1428 Motor Circuit Malfunction

DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) judges that an abnormality occurred in the circuit used to operate the pump motor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

C1428

Motor Circuit Malfunction

A malfunction occurs in the pump motor circuit.

Pump motor circuit

Tire pressure warning light (w/ tire pressure warning system) is off.

WIRING DIAGRAM

Refer to DTC C146C.

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CAUTION / NOTICE / HINT

Note:

  • When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

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  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (+BM TERMINAL)

    1. C305133C10

      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A39-1 (+BM) - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

    1. C305133C11

      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A39-13 (GND2) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

    OK

  3. RECONFIRM DTC

    1. Reconnect the A39 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs.

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      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Perform a road test.

    6. Check if the same DTC is output.

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      Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1428 is not output.

    A

    DTC C1428 is output.

    B
    A

    USE SIMULATION METHOD TO CHECK

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    B

    REPLACE BRAKE ACTUATOR ASSEMBLY

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