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DTC    P1578    Brake System Malfunction

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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

WIRING DIAGRAM


E149011E13


INSPECTION PROCEDURE

HINT:
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.

1.CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

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

  1. 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.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    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-OFF button) on.

    3. Push the -SET button to activate the cruise control.

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

  1. Read the DTCs.

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



B
Go to step 3
A

USE SIMULATION METHOD TO CHECK (Click here)  

3.REPLACE BRAKE BOOSTER WITH MASTER CYLINDER
Replace the brake booster with master cylinder (skid control ECU) (Click here for LHD, Click here for RHD).

NEXT


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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Clear the DTC (Click here).

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    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-OFF button) on.

    3. Push the -SET button to activate the cruise control.

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

  1. Read the 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