CRUISE CONTROL SYSTEM, Diagnostic DTC:P1578

DTC Code DTC Name
P1578 Brake System Malfunction

DESCRIPTION

This DTC is output when the electronically controlled brake system has a problem. Check the electronically controlled brake system when this DTC is output.

DTC No. Detection Item DTC Detection Condition Trouble Area
P1578 Brake System Malfunction The power management control ECU receives a brake system error signal for 0.2 sec. or more while the cruise control is operating

  • Electronically controlled brake system

  • Power management control ECU

WIRING DIAGRAM

A01KR40E66
*1 Skid Control ECU (Brake Booster with Master Cylinder Assembly)
*2 Power Management Control ECU
*3 CAN Communication Line

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


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Read the DTCs following the prompts on the GTS screen. Enter the following menus: Chassis / ABS/VSC/TRC / Trouble Codes.


      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 power switch off.


    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  2. CHECK FOR DTCs (DTC P1578)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Cruise Control > Clear DTCs

    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 switch (ON-OFF button).

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

    6. Check the DTCs.


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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY


    1. Replace the brake booster with master cylinder assembly.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (DTC P1578)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Cruise Control > Clear DTCs

    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 switch (ON-OFF button).

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

    6. Check the DTCs.


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

    A

    END

    B

    REPLACE POWER MANAGEMENT CONTROL ECU for LHD: Click here
    REPLACE POWER MANAGEMENT CONTROL ECU for RHD: Click here