Toyota Yaris: Vehicle Stability Control System / Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open (C122D14)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open (C122D14)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C122D14

Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open

Master cylinder pressure sensor power supply voltage decrease occurs or history of voltage decrease exists, and defective master cylinder pressure sensor output continues for 1.2 seconds or more.

  • Master cylinder pressure sensor output defective
  • Skid control ECU (brake actuator assembly)

Brake

WIRING DIAGRAM

Refer to DTC C137BA2.

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 HARNESS AND CONNECTOR (+BS TERMINAL)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

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

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A108-38 (+BS) - Body ground

Always

11 to 14 V

A108-38 (+BS) - A108-25 (GND1)

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

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

3.

RECONFIRM DTC

(a) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

(b) Check if the same DTC is output.

Result

Proceed to

C122D14 is not output

A

C122D14 is output

B

A

USE SIMULATION METHOD TO CHECK

B

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