Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Electronic Brake Booster Input Stroke Sensor "A" Circuit Short to Ground (C127A11,...,C128F64)

Toyota Corolla Cross (2022-2024) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hev Model) / Electronic Brake Booster Input Stroke Sensor "A" Circuit Short to Ground (C127A11,...,C128F64)

DESCRIPTION

The relative displacement sensor is built into the brake booster with master cylinder assembly.

When the relative displacement sensor inside the electric brake booster (brake booster with master cylinder assembly) meets the detection conditions, this DTC is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C127A11

Electronic Brake Booster Input Stroke Sensor "A" Circuit Short to Ground

Open in relative displacement sensor (brake booster with master cylinder assembly) signal circuit for 0.1 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127C
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127A15

Electronic Brake Booster Input Stroke Sensor "A" Circuit Short to Battery or Open

Short in relative displacement sensor (brake booster with master cylinder assembly) signal circuit for 0.1 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127D
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127A16

Electronic Brake Booster Input Stroke Sensor "A" Circuit Voltage Below Threshold

Relative displacement sensor (brake booster with master cylinder assembly) output value is -3.9 mm or less for 0.2 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127B (Case 4, 7)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127A17

Electronic Brake Booster Input Stroke Sensor "A" Circuit Voltage Above Threshold

Relative displacement sensor (brake booster with master cylinder assembly) output value is 3.4 mm or more for 0.2 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127B (Case 2, 6)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127A23

Electronic Brake Booster Input Stroke Sensor "A" Signal Stuck Low

Relative displacement sensor (brake booster with master cylinder assembly) output value is less than 0.6 mm for 0.3 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127B (Case 3)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127A24

Electronic Brake Booster Input Stroke Sensor "A" Signal Stuck High

While driving at a vehicle speed of 3 km/h (2 mph) or more, the brake pedal stroke distance is between 0.6 mm and 1.5 mm for 60 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127B (Case 1 and 5)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127A64

Electronic Brake Booster Input Stroke Sensor "A" Signal Plausibility Failure

Relative displacement sensor (brake booster with master cylinder assembly) output signal interrupted for 0.1 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127B (Case 8)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127A86

Electronic Brake Booster Input Stroke Sensor "A" Signal (some circuit quantity, reported via serial data) Invalid

Relative displacement sensor (brake booster with master cylinder assembly) malfunction is detected for 1 second or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127A (Case 1)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127A96

Electronic Brake Booster Input Stroke Sensor "A" Component Internal Failure

Relative displacement sensor (brake booster with master cylinder assembly) internal malfunction is detected for 0.1 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127A (Case 2)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C127F1C

Electronic Brake Booster Input Stroke Sensor Supply Voltage Circuit Voltage Out of Range

Relative displacement sensor (brake booster with master cylinder assembly) power source voltage (VSK) is less than 4.8 V or more than 5.18 V for 0.08 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C127F
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C128A11

Electronic Brake Booster Input Stroke Sensor "B" Circuit Short to Ground

Open in relative displacement sensor (brake booster with master cylinder assembly) signal circuit for 0.2 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C128C
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C128A15

Electronic Brake Booster Input Stroke Sensor "B" Circuit Short to Battery or Open

Short in relative displacement sensor (brake booster with master cylinder assembly) signal circuit for 0.2 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C128D
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C128A64

Electronic Brake Booster Input Stroke Sensor "B" Signal Plausibility Failure

Relative displacement sensor (brake booster with master cylinder assembly) operation failure is detected for 0.2 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C128B
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C128F64

Electronic Brake Booster Input Stroke Sensor "A" / "B" Signal Plausibility Failure

Difference between change amounts of relative displacement sensor (brake booster with master cylinder assembly) output 1 (SKS1) and relative displacement sensor (brake booster with master cylinder assembly) output 2 (SKS2) is abnormally large for 0.2 seconds or more.

  • Wire harness or connector
  • Brake booster with master cylinder assembly

Comes on

Brake Booster

  • SAE Code: C128F
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

MONITOR DESCRIPTION

C127A (Case 1):
  • When the electronically controlled brake system is starting and a differential travel sensor invalid state continues for a certain amount of time, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127A (Case 2):
  • When the electronically controlled brake system is operating or shutting down and a differential travel sensor malfunction is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127B (Case 1):
  • When the vehicle is being driven at a certain speed or more, the electronically controlled brake system is operating, and the output value of the differential travel sensor is outside of a certain range for a certain amount of time, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127B (Case 2 and 6):
  • When the electronically controlled brake system is operating and the output value of the differential travel sensor is a certain value or more, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127B (Case 3):
  • When the electronic electronically controlled brake system is not operating and the output value of the differential travel sensor is less than a certain value, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127B (Case 4 and 7):
  • When the electronically controlled brake system is operating and the output value of the differential travel sensor is a certain value or less, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127B (Case 5-1):
  • When the vehicle is being driven at a certain speed or more, the electronically controlled brake system is operating, and the output value of the differential travel sensor is outside of a certain range for the current trip and previous trip for a certain amount of time, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127B (Case 5-2):
  • When the vehicle is being driven at less than a certain speed, the electronically controlled brake system is operating, and the output value of the differential travel sensor is outside of a certain range for the current trip and previous trip for a certain amount of time, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127B (Case 8):
  • When the electronically controlled brake system is operating or shutting down and a differential travel sensor invalid state is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127C and C128C:
  • When the electronically controlled brake system is operating or shutting down and an open in the signal circuit of the differential travel sensor is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127D and C128D:
  • When the electronically controlled brake system is operating or shutting down and a short in the signal circuit of the differential travel sensor is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C127F:
  • When the electronically controlled brake system is operating or shutting down and the power supply voltage of the differential travel sensor is outside of a certain range, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C128B:
  • When the electronically controlled brake system is operating or shutting down and the PWM duty cycle or PWM operation frequency of the differential travel sensor is outside of a certain range, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C128F:
  • When the electronically controlled brake system is operating and the difference between output 1 and output 2 of the differential travel sensor exceeds a certain value, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C127A (Case 1): Relative displacement sensor time out

C127A (Case 2): Relative displacement sensor internal failure (sent)

C127B (Case 1): Relative displacement sensor offset monitoring (high-suspicious)

C127B (Case 2): Relative displacement sensor range monitoring (channel 1 high)

C127B (Case 3): Relative displacement sensor offset monitoring (low)

C127B (Case 4): Relative displacement sensor range monitoring (channel 1 low)

C127B (Case 5): Relative displacement sensor offset monitoring (high)

C127B (Case 6): Relative displacement sensor range monitoring (channel 2 high)

C127B (Case 7): Relative displacement sensor range monitoring (channel 2 low)

C127B (Case 8): Relative displacement sensor communication failure (sent)

C127C: Relative displacement sensor line monitoring (sent-low)

C127D: Relative displacement sensor line monitoring (sent-high)

C127F: Relative displacement sensor supply line monitor

C128B: Relative displacement sensor PWM monitor

C128C: Relative displacement sensor line monitoring (PWM-low)

C128D: Relative displacement sensor line monitoring (PWM-high)

C128F: Relative displacement sensor rationality monitoring

Required Sensors/Components(Main)

Electric brake booster (brake booster with master cylinder assembly)

Required Sensors/Components(Related)

Electric brake booster (brake booster with master cylinder assembly)

Speed sensor

Frequency of Operation

Continuous: C127B (Case 1 to 8), C127C, C127D, C127F, C128B, C128C, C128D, C128F

During initial checking: C127A (Case 1 and 2)

Duration

0.08 seconds: C127F

0.1 seconds: C127A (Case 2), C127B (Case 8), C127C and C127D

0.2 seconds: C127B (Case 2, 4, 6 and 7), C128B, C128C, C128D and C128F

0.3 seconds: C127B (Case 3)

1 second: C127A (Case 1)

60 seconds: C127B (Case 1 and 5-1)

300 seconds: C127B (Case 5-2)

MIL Operation

Immediately: C127A (Case 1 and 2)

2 driving cycles: C127B (Case 1, 2, 3, 4, 5, 6, 7 and 8), C127C, C127D, C127F, C128B, C128C, C128D and C128F

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. Wait for 1 second or more. [*]

    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 Booster / Utility / All Readiness.
  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

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR

(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 A189 electric brake booster (brake booster with master cylinder assembly) connector.

(d) Disconnect the A185 relative displacement sensor (brake booster with master cylinder assembly) connector.

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

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A189-19 (VSK) - A185-2 (VSK)

Always

Below 1 Ω

A189-19 (VSK) or A185-2 (VSK) - Body ground and other terminals

Always

10 kΩ or higher

A189-6 (SKS1) - A185-1 (SKS1)

Always

Below 1 Ω

A189-6 (SKS1) or A185-1 (SKS1) - Body ground and other terminals

Always

10 kΩ or higher

A189-7 (SKS2) - A185-3 (SKS2)

Always

Below 1 Ω

A189-7 (SKS2) or A185-3 (SKS2) - Body ground and other terminals

Always

10 kΩ or higher

A189-25 (SKG) - A185-4 (SKG)

Always

Below 1 Ω

A189-25 (SKG) or A185-4 (SKG) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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