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. DTC Detection Condition Trouble Area
P1578 The power management control ECU receives a brake system error signal for 0.2 sec. or more while the cruise control is in operation

  • Electronically controlled brake system

  • Power management control ECU

WIRING DIAGRAM

A011WXZE51

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 Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

    5. Check for 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 FOR DTCs (DTC P1578)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream 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 switch (ON-OFF button).

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

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

    7. Check for DTCs.

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

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    Replace the brake booster with master cylinder assembly (skid control ECU) Click here.

    NEXT

  4. CHECK FOR DTCs (DTC P1578)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream 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 switch (ON-OFF button).

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

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

    7. Check for DTCs.

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

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

    END