Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000025DUX
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C117B62; Brake Pressure Sensor "A" / Brake Switch "A" Signal Compare Failure; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

DTC

C117B62

Brake Pressure Sensor "A" / Brake Switch "A" Signal Compare Failure

DESCRIPTION

The skid control ECU (brake actuator assembly) receives stop light switch assembly signals and uses them to determine whether or not the brakes are applied.

When the brake pedal is depressed and no signal is received from the stop light switch assembly, this DTC is output.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C117B62

Brake Pressure Sensor "A" / Brake Switch "A" Signal Compare Failure

Either of the following is detected when the vehicle speed of 3 km/h (2 mph) or more:

  1. With the stop light switch assembly off, the stop light switch assembly is judged to be on based on the master cylinder pressure value for 3 seconds or more.
  2. With the stop light switch assembly off, the master cylinder pressure is more than 8 MPa (81.6 kgf/cm2, 1160 psi) for 3 seconds or more.
  • Stop light switch assembly
  • Wire harness or connector
  • Skid control ECU (brake actuator assembly)

Comes on

Brake/EPB
  • SAE Code: C117B
  • Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

C117B (Case 1):

  • When the vehicle is being driven at a certain speed or more, 60 seconds or more have elapsed after operation of the brake pedal, and any of the following conditions continue for a certain amount of time, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.
    • The master cylinder pressure after the offset calibration is a certain value or more.
    • The master cylinder pressure before the offset calibration is a certain value or more.
    • The vehicle speed is a certain value or more and the master cylinder pressure is less than a certain value.
    • The stop light switch assembly is off, and the master cylinder pressure is a certain value or more.

C117B (Case 2):

  • When the vehicle is being driven at a certain speed or more, the brake pedal is not operated, the ABS is not operating, and the master cylinder pressure exceeds a certain value for a certain amount of time, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C117B (Case 1): Stop light switch / pressure sensor rationality monitoring (logic 1)

C117B (Case 2): Stop light switch / pressure sensor rationality monitoring (logic 2)

Required Sensors/Components(Main)

Skid control ECU (brake actuator assembly)

Speed sensor

Stop light switch assembly

Required Sensors/Components(Related)

Skid control ECU (brake actuator assembly)

Speed sensor

Stop light switch assembly

Frequency of Operation

Continuous

Duration

3 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

TMC's intellectual property

-

CONFIRMATION DRIVING PATTERN

NOTICE:

When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off.
  5. Turn the ignition switch to ON (READY) and turn the GTS on.
  6. Drive the vehicle at 3 km/h (2 mph) or more for 3 seconds. [*]

    HINT:

    [*]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Chassis / Brake/EPB* / Utility / All Readiness.

    *: Electric Parking Brake System

  8. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE, perform driving pattern again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

READ VALUE USING GTS (MASTER CYLINDER SENSOR)

(a) Check the Data List using the GTS.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Master Cylinder Sensor 1

Master cylinder pressure sensor pressure (value detected by ECU)

Min.: -1.00 MPa, Max.: 23.99 MPa

Brake pedal released: -1.00 to 0.00 MPa

Reading increases when brake pedal is depressed

Chassis > Brake/EPB > Data List

Tester Display

Master Cylinder Sensor 1

(b) Check the value of Data List item Master Cylinder Sensor 1 when the brake pedal is released.

OK:

The value of Data List item Master Cylinder Sensor 1 when the brake pedal is released is less than 0.15 MPa.

NG

GO TO STEP 4

OK

2.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY SIGNAL INPUT CIRCUIT)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to skid control ECU (Brake Actuator Assembly))

(b) Disconnect the A51 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

A51-41 (STP) - Body ground

Brake pedal depressed

11 to 14 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

3.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

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

OK:

The connector is securely connected.

(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A53 stop light switch assembly connector.

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

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A53-3 (L) - A51-41 (STP)

Always

Below 1 Ω

A53-3 (L) or A51-41 (STP) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK DTC

(a) Read the DTCs using the GTS.

Chassis > Brake/EPB > Trouble Codes

Result

Proceed to

C117B62 and C05401C, C054028, C054029, C054031, C054049 and/or C054096 are output simultaneously

A

C117B62 is output

B
A

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
B

GO TO BRAKE SYSTEM

Refer to "Brake drag" of problem symptoms table.

Inspect brake system: Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; BRAKE SYSTEM (OTHER): BRAKE SYSTEM (for HV Model): ON-VEHICLE INSPECTION

Inspect brake pedal free play: Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; BRAKE SYSTEM (OTHER): BRAKE PEDAL (for HV Model): ADJUSTMENT