Toyota Tacoma (2015-2018) Service Manual: Brake System (P1578)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2tr-fe) / Brake System (P1578)

DESCRIPTION

This DTC is stored when a malfunction is detected in the vehicle stability control system. Check the vehicle stability control system when DTC P1578 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P1578	Brake System	While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar 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 Skid control ECU (brake actuator assembly) ECM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the ECM, refer to Registration.
w/o Smart Key System: Click here

w/ Smart Key System: Click here
First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting
Click here

PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check for DTCs.

Click here

Result	Proceed to
DTCs are not output	A
Vehicle stability control system DTCs are output	B

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTCs (RADAR CRUISE1)

(a) Clear the DTCs.

Click here (b) Perform the following to make sure that the DTC detection conditions are

(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 dynamic radar cruise control operation is possible.
Turn the cruise control system on using the cruise control main switch (ON-OFF button).
Drive the vehicle at 36 km/h (22 mph) or more for 0.2 seconds or more.

Click here

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

USE SIMULATION METHOD TO CHECK

3.	REPLACE ECM

(a) Replace the ECM.

Click here

4.	CHECK FOR DTCs (RADAR CRUISE1)

(a) Clear the DTCs.

Click here (b) Perform the following to make sure that the DTC detection conditions are

(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 dynamic radar cruise control operation is possible.
Turn the cruise control system on using the cruise control main switch (ON-OFF button).
Drive the vehicle at 36 km/h (22 mph) or more for 0.2 seconds or more.

Click here

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

END

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

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DESCRIPTION The ECM sends signals such as A/T information signals, dynamic radar cruise control operation signals, brake operation demand signals, and buzzer operation demand signals to the skid ...

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