CRUISE CONTROL SYSTEM(for 2GR-FE, 2AR-FE), Diagnostic DTC:P1578

DTC Code DTC Name
P1578 Brake System

DESCRIPTION

This DTC is output when the VSC system has a problem. Check the VSC system when this DTC is output.

DTC No. DTC Detection Condition Trouble Area
P1578 The ECM receives a brake system error signal for 0.2 sec. or more while the cruise control is operating.

  • VSC system

  • Skid control ECU (brake actuator assembly)

  • ECM

WIRING DIAGRAM

A01W5JXE01

CAUTION / NOTICE / HINT

Tech Tips

This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

PROCEDURE


  1. CHECK FOR DTCs (ABS/VSC/TRC)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Trouble Codes.

    5. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    6. Turn the engine switch off.


    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

  2. CHECK FOR DTCs (DTC P1578)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control main switch (ON/OFF button).

      3. Push the cruise control main switch to -/SET to begin control of vehicle speed by the cruise control system.

    5. Enter the following menus: Powertrain / Cruise Control / Trouble Codes.

    6. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P1578 is output B

    7. Turn the engine switch off.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here


    NEXT

  4. CHECK FOR DTCs (DTC P1578)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control main switch (ON/OFF button).

      3. Push the cruise control main switch to -/SET to begin control of vehicle speed by the cruise control system.

    6. Enter the following menus: Powertrain / Cruise Control / Trouble Codes.

    7. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P1578 is output (for 2GR-FE) B
      DTC P1578 is output (for 2AR-FE) C

    8. Turn the engine switch off.


    A

    END

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here