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

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

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL
P157800	Brake System	While the ignition switch is ON 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 ECM	Does not come on

CAUTION / NOTICE / HINT

NOTICE:

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

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

w/ Smart Key System: Click here

PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check for DTCs.

for Hydraulic Brake Booster: Click here
for Vacuum Brake Booster: Click here

Result	Proceed to
DTCs are not output	A
DTCs are output (for Hydraulic Brake Booster)	B
DTCs are output (for Vacuum Brake Booster)	C

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTCs (CRUISE CONTROL SYSTEM)

(a) Clear the DTCs.

Click here (b) Perform the following procedure.

(b) Perform the following procedure.

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

Turn the ignition switch to ON.
Turn the dynamic radar cruise control system on using the cruise control main switch.
Wait for 1 second or more.

Click here

Result	Proceed to
DTC P157800 is not output	A
DTC P157800 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE ECM

Lost Communication With ECM/PCM "A" Missing Message (U010087,U010487,U012287)

DESCRIPTION The ECM communicates with each sensor and ECU via CAN communication. If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored ...

Cruise Control Input Processor (P160700)

DESCRIPTION The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from the CPUs are different and deviate from the standard ...

Other materials:

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Installation
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