Toyota Yaris: Vehicle Stability Control System / Brake Switch "A" Circuit Short to Ground (P057111)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Brake Switch "A" Circuit Short to Ground (P057111)

DESCRIPTION

The skid control ECU (brake actuator assembly) inputs the stop light signal and brake operation condition.

When the brake pedal is depressed and the stop light switch signal is not input, this DTC is output.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

P057111

Brake Switch "A" Circuit Short to Ground

Either of the following is detected:

  • When the +BS terminal voltage is 9.5 V or higher and the brake pedal load sensing switch is ON, the stop light switch signal is input continuously for 2 seconds or more with the master cylinder pressure at 2 MPa (20.4 kgf/cm2) or higher and the deceleration calculated from the vehicle speed at 0.2 G or higher.
  • After a master cylinder pressure of more than 1.764 MPa (18.0 kgf/cm2) is detected for 5 seconds or more continuously at a vehicle speed below 3 km/h (2 mph) with the stop light switch assembly off, the master cylinder pressure exceeds 1.764 MPa (18.0 kgf/cm2) for 1 second or more continuously while and the stop light switch assembly signal is not received when the vehicle decelerates from over 35 km/h (22 mph) to 3 km/h (2 mph).
  • Stop light switch assembly
  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)

Brake

WIRING DIAGRAM

Refer to DTC C13807E.

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

    Click here

PROCEDURE

1.

CHECK BRAKE PEDAL HEIGHT AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION

Click here

OK:

The brake pedal height and stop light switch assembly installation are normal.

HINT:

If the on/off status of the stop light switch assembly and the pressure increase information from the master cylinder pressure sensor do not match due to an improperly installed brake pedal or stop light switch assembly, this DTC may be stored. Therefore, be sure to check the installation condition of the pedal and stop light switch assembly before inspecting the input signals and other related parts.

NG

ADJUST BRAKE PEDAL HEIGHT OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION

OK

2.

CHECK STOP LIGHT OPERATION

(a) Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

OK:

Condition

Illumination Condition

Brake pedal depressed.

On

Brake pedal released.

Off

NG

GO TO STEP 10

OK

3.

READ VALUE USING GTS (STOP LIGHT SW)

(a) Operate the GTS to check the Data List.

Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light SW

Stop light switch assembly

(STP terminal input)

OFF / ON

OFF: Brake pedal released

ON: Brake pedal depressed

HINT:

The brake pedal state is determined using the voltage at terminal STP

Chassis > Brake > Data List

Tester Display

Stop Light SW

(b) Check that the stop light switch display and brake pedal load sensing switch display observed on the GTS change according to brake pedal operation.

OK:

The GTS displays OFF / ON according to brake pedal operation.

(c) Slowly depress the brake pedal, and check when the stop light switch assembly and brake pedal load sensing switch turn on.

NG

GO TO STEP 6

OK

4.

CLEAR DTC

(a) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(b) Press the DTC clear button.

(c) Turn the ignition switch off.

NEXT

5.

RECONFIRM DTC

(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

(b) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

(c) Check if the same DTC is output.

Result

Proceed to

P057111 is not output

A

P057111 is output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

6.

CHECK HARNESS AND CONNECTOR (STP TERMINAL)

(a) Turn the ignition switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A108 skid control ECU (brake actuator assembly) connector.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A108-35 (STP) - Body ground

Stop light switch assembly on (Brake pedal depressed)

8 to 14 V

A108-35 (STP) - Body ground

Stop light switch assembly off (Brake pedal released)

Below 1.5 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CLEAR DTC

(a) Reconnect the A108 skid control ECU (brake actuator assembly) connector.

(b) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(c) Press the DTC clear button.

(d) Turn the ignition switch off.

NEXT

8.

RECONFIRM DTC

(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

(b) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

(c) Check if the same DTC is output.

Result

Proceed to

P057111 is not output

A

P057111 is output

B

B

REPLACE BRAKE ACTUATOR ASSEMBLY

A

9.

INSPECT STOP LIGHT SWITCH ASSEMBLY

Click here

OK:

The stop light switch assembly is normal.

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

10.

INSPECT STOP LIGHT SWITCH ASSEMBLY

Click here

OK:

The stop light switch assembly is normal.

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

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