DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:P1578

DTC Code DTC Name
P1578 Brake System

DESCRIPTION

This DTC is output when the vehicle stability control system has a problem. Check the vehicle stability control 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.

  • Vehicle stability control system

  • Skid control ECU (master cylinder solenoid)

  • ECM

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/TRAC)


    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 Click here.

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

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

  2. CHECK DTC OUTPUT (RADAR CRUISE1)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Clear for DTCs Click here.

    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 dynamic radar cruise control system on using the cruise control main switch (ON/OFF).

      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 Click here.

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE SKID CONTROL ECU (MASTER CYLINDER SOLENOID)

    Replace the skid control ECU (master cylinder solenoid).



    NEXT

  4. CHECK DTC OUTPUT (RADAR CRUISE1)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Clear the DTCs Click here.

    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 dynamic radar cruise control system on using the cruise control main switch (ON/OFF).

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

    5. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC P1578 is not output A
      DTC P1578 is output (for 3UR-FE) B
      DTC P1578 is output (for 1VD-FTV) C

    A

    END

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here