DYNAMIC RADAR CRUISE CONTROL SYSTEM, 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. Detection Item DTC Detection Condition Trouble Area
P1578 Brake System

  • When the dynamic radar cruise control system is operating, the ECM receives a brake system error signal for 0.2 seconds or more.

  • When the ECM detects a malfunction in the brake system and CAN communication from the ECM to the brake system is stopped.

  • VSC system

  • Skid control ECU (brake actuator assembly)

  • 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/TRC)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Check for DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      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 FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. 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 dynamic radar cruise control operation is possible.

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

      3. Depress the brake pedal for 0.4 seconds or more.

    5. Enter the following menus: Powertrain / Radar Cruise1 / Trouble Codes.

    6. Check for DTCs.


      1. for 2AD-FHV, 2AD-FTV:


        Powertrain > Radar Cruise1 > Trouble Codes

      2. for 2AR-FE, 3ZR-FE, 3ZR-FAE:


        Powertrain > Radar Cruise1 > Trouble Codes

      3. for 2WW:


        Powertrain > Cruise Control > Trouble Codes
      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 (BRAKE ACTUATOR ASSEMBLY)


    1. Replace the skid control ECU (brake actuator assembly).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here


      1. for 2AD-FHV, 2AD-FTV:


        Powertrain > Radar Cruise1 > Clear DTCs

      2. for 2AR-FE, 3ZR-FE, 3ZR-FAE:


        Powertrain > Radar Cruise1 > Clear DTCs

      3. for 2WW:


        Powertrain > Cruise Control > Clear DTCs

    5. 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 dynamic radar cruise control operation is possible.

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

      3. Depress the brake pedal for 0.4 seconds or more.

    6. Enter the following menus: Powertrain / Radar Cruise1 / Trouble Codes.

    7. Check for DTCs.

      Click here


      1. for 2AD-FHV, 2AD-FTV:


        Powertrain > Radar Cruise1 > Trouble Codes

      2. for 2AR-FE, 3ZR-FE, 3ZR-FAE:


        Powertrain > Radar Cruise1 > Trouble Codes

      3. for 2WW:


        Powertrain > Cruise Control > Trouble Codes
      Result
      Result Proceed to
      DTC P1578 is not output A
      DTC P1578 is output B

    A

    END

    B

    REPLACE ECM for 2AD-FHV: Click here
    REPLACE ECM for 2AD-FTV: Click here
    REPLACE ECM for 2AR-FE: Click here
    REPLACE ECM for 3ZR-FAE: Click here
    REPLACE ECM for 3ZR-FE: Click here
    REPLACE ECM for 2WW: Click here