DTC    P1578    Brake System Malfunction

for Preparation Click here


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
  1. Electronically controlled brake system
  1. Power management control ECU

WIRING DIAGRAM


E149011E38


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. 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 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 at a speed of between approximately 40 km/h (25 mph) and 200 km/h (125 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

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

  1. Check for 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 herefor 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 DTCs (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 at a speed of between approximately 40 km/h (25 mph) and 200 km/h (125 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Cruise Control / Trouble Codes.

  1. 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