Toyota Tundra Service Manual: Brake System Malfunction (P1578)

Toyota Tundra Service Manual / Engine, Hybrid System / Cruise Control / Cruise Control System / Brake System Malfunction (P1578)

DESCRIPTION

This DTC is stored when the vehicle stability control system has a problem. Check the vehicle stability control system when DTC P1578 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P1578	Brake System Malfunction	When the ignition switch ON and the cruise control system is operating, a malfunction in the vehicle stability control system is detected for 0.2 seconds or more.	Vehicle stability control system ECM Skid control ECU (Brake actuator assembly)

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the ECM, refer to Registration.

Click here

PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check for DTCs.

Click here

OK:

Vehicle stability control system DTCs are not output.

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTCs (CRUISE CONTROL SYSTEM)

(a) Clear the DTCs.

Click here

(b) 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.

Drive the vehicle at a speed for which cruise control operation is possible.
Turn the cruise control system on using the cruise control main switch (ON-OFF button).
Push the cruise control main switch to -SET to begin control of vehicle speed using the cruise control system.

Click here

OK:

DTC P1578 is not output.

USE SIMULATION METHOD TO CHECK

3.	REPLACE ECM

(a) Replace the ECM.

for 1UR-FE: Click here

for 3UR-FE: Click here

4.	CHECK FOR DTCs (CRUISE CONTROL SYSTEM)

(a) Clear the DTCs.

Click here

(b) 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.

Drive the vehicle at a speed for which cruise control operation is possible.
Turn the cruise control system on using the cruise control main switch (ON-OFF button).
Push the cruise control main switch to -SET to begin control of vehicle speed using the cruise control system.

Click here

OK:

DTC P1578 is not output.

END

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Cruise Control Input Circuit (P0575)

Parts Location

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