Toyota Tacoma (2015-2018) Service Manual: Brake System (P157800)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Cruise Control System(for 2gr-fks) / Brake System (P157800)

DESCRIPTION

This DTC is output when the VSC system has a problem. Check the VSC system when this DTC is output.

DTC No.	DTC Detection Condition	Trouble Area	MIL	Note
P157800	Diagnosis Condition: Cruise control in operation Malfunction Status: Brake System Malfunction	VSC system ECM	Does not come on	SAE: P1578

CAUTION / NOTICE / HINT

HINT:

When this DTC is output, confirm that the vehicle stability control system is normal since it may be malfunctioning.

for Hydraulic Brake Booster: See page for Vacuum Brake Booster: See page

for Vacuum Brake Booster: See page PROCEDURE

PROCEDURE

1.	CHECK FOR DTC (ABS/VSC/TRAC)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch on.

(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.

(e) Check for DTCs (See page OK: ).

OK:

Vehicle stability control system DTCs are not output

Result

Result	Proceed to
OK	A
NG (for Hydraulic Brake Booster)	B
NG (for Vacuum Brake Booster)	C

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTC (DTC P157800)

(a) Clear the DTCs (See page (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.

(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 main switch (ON/OFF).

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

(d) 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 for which cruise control operation is possible.

(2) Turn the cruise control system on using the cruise control main switch (ON/OFF).

(3) Push the cruise control main switch to -/SET to begin control of vehicle speed by the cruise control system.

(e) Check the DTCs (See page OK: ).

OK:

DTC P157800 is not output

USE SIMULATION METHOD TO CHECK

REPLACE ECM

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Other materials:

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Heater Circuit (C1AAE)
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TRAC OFF Indicator Light Remains ON
DESCRIPTION In 2WD mode: Operation of the VSC OFF switch changes the vehicle between normal mode, TRAC OFF mode (AUTO LSD mode) and VSC OFF mode. During normal mode, pressing the VSC OFF switch for a short amount of time changes the vehicle to TRAC OFF mode (AUTO LSD mode), TR ...