Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Brake Switch "A" Signal Compare Failure (P057162)

DESCRIPTION

When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the dynamic radar cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP fuse and the stop light switch assembly, and the ECM turns the dynamic radar cruise control system off.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

P057162

Brake Switch "A" Signal Compare Failure

While the ignition switch is ON and the dynamic radar cruise control system is operating, voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for approximately 0.5 seconds or more.

  • Stop light switch assembly
  • Harness or connector
  • ECM

Does not come on

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the ECM, refer to Registration.

    w/o Smart Key System: Click here w/ Smart Key System: Click here

    w/ Smart Key System: Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the stop light switch assembly connector.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

S10-2 - Body ground

Always

11 to 14 V

S10-4 - Body ground

Ignition switch to ON

11 to 14 V

S10-4 - Body ground

Ignition switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Remove the stop light switch assembly.

Click here (b) Inspect the stop light switch assembly.

(b) Inspect the stop light switch assembly.

Click here

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the E13 ECM connector.

(b) Disconnect the S10 stop light switch assembly connector.

(c) Disconnect the S1 skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 connector.

  • *1: for Hydraulic Brake Booster
  • *2: for Vacuum Brake Booster

(d) Disconnect the S7 shift lock control unit connector.

(e) Remove the STOP relay from the engine room relay block.

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

E13-15 (ST1-) - S10-3

Always

Below 1 Ω

E13-16 (STP) - S10-1

Always

Below 1 Ω

E13-15 (ST1-) or S10-3 - Body ground

Always

10 kΩ or higher

E13-16 (STP) or S10-1 - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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