CRUISE CONTROL SYSTEM, Diagnostic DTC:P1578

DTC Code DTC Name
P1578 Brake System Malfunction

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
P1578 The power management control ECU receives a brake system error signal for 0.2 seconds or more while the cruise control is in operation Electronically controlled brake system

WIRING DIAGRAM

A01NHHWE02

INSPECTION PROCEDURE

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 DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

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

    5. Read the DTC.

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

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  2. CHECK WHETHER DTC OUTPUT RECORDS (CRUISE CONTROL SYSTEM)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester 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 of 40 km/h (25 mph) or more.

      2. Turn the cruise control main switch on.

    6. Enter the following menus: Powertrain / Cruise Control / DTC.

    7. Read the DTCs.

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

    B

    REPLACE SKID CONTROL ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. REPLACE SKID CONTROL ECU

    Replace the skid control ECU Click here.


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECORDS (CRUISE CONTROL SYSTEM)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Clear the DTC 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 of 40 km/h (25 mph) or more.

      2. Turn the cruise control main switch on.

    6. Enter the following menus: Powertrain / Cruise Control / DTC.

    7. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P1578 is output (for LHD) B
      DTC P1578 is output (for RHD) C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    A

    END