ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1247/47, C1346/71, C1392/48

DTC Code DTC Name
C1247/47 Stroke Sensor Malfunction
C1346/71 Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC)
C1392/48 Stroke Sensor Zero Point Calibration Undone

DESCRIPTION

The brake pedal stroke sensor sends a signal about the pedal stroke to the skid control ECU.

DTC C1346/71 will be cleared when the brake pedal stroke sensor sends a stroke sensor signal or when Test Mode ends. DTC C1346/71 is output only in Test Mode.

DTC Code INF Code DTC Detection Condition Trouble Area
C1247/47 211 Sensor supply voltage (VCM1) is 4.75 V or less, or 5.25 V or more for 0.2 seconds or more.

  • Open or short in brake pedal stroke sensor power supply circuit

  • Improperly connected connector, deformation or corrosion of terminals

  • Brake booster with master cylinder (Skid control ECU)
↑ 212 Sensor output voltage 1 (SKS1) is less than 3%, or 97% or more (less than 0.15 V, or 4.85 V or more) of sensor supply voltage (VCM1) for 0.2 seconds or more.

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Brake pedal stroke sensor
↑ 213 Sensor output voltage 2 (SKS2) is less than 3%, or 97% or more (less than 0.15 V, or 4.85 V or more) of sensor supply voltage (VCSK) for 0.2 seconds or more. ↑
↑ 214

Either of the following is detected:


  1. Fluctuation of sensor output 1 (SKS1) is out of specification.

  2. The difference between the present value and last value of sensor output voltage 1 (SKS1) is 8.5% or more (0.43 V or more) of sensor supply voltage (VCM1) for 0.2 seconds or more.

 ↑
↑ 215

Either of the following is detected:


  1. Fluctuation of sensor output 2 (SKS2) is out of specification.

  2. The difference between the present value and last value of the sensor output voltage 2 (SKS2) is 8.5% or more (0.43 V or more) of the sensor supply voltage (VCM1) for 0.2 seconds or more.

 ↑
↑ 216

Either of the following is detected:


  1. Brake pedal OFF position (zero point learned value) is out of specification.

  2. The zero point learned value of sensor output 1 (SKS1) is -17% to 25.9% (0.15 to 2.3V) or more than the theoretical value.

 ↑
↑ 217

Either of the following is detected:


  1. Brake pedal OFF position (zero point learned value) is out of specification.

  2. The zero point learned value of sensor output 2 (SKS2) is -31.7% to 17% (2.42 to 4.85V) or more than the theoretical value.

 ↑
↑ 218 An excessive difference between the change in sensor output 1 (SKS1) and sensor output 2 (SKS2) is detected for 0.2 seconds or more. ↑
↑ 219

Sensor data is invalid for 0.2 seconds or more.

(Skid control ECU internal monitor circuit malfunction.)

 ↑
↑ 220 The output from sensor 1 (SKS1) and sensor 2 (SKS2) differ by 15% or more from the theoretical value 5 V. ↑
↑ 221 The output variation between sensor 1 (SKS1) and sensor 2 (SKS2) differ by an excessive amount. ↑
↑ 222 Sensor data is invalid for 0.2 seconds or more with sensor supply voltage (VCM1) 4.75 V or less, or 5.25 V or more. ↑
↑ 223

Sensor data is invalid for 0.2 seconds or more.

(Open, short, or noise.)

 ↑
C1392/48 - Zero point calibration of stroke sensor is unfinished.

  • Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete)

  • Brake booster with master cylinder (Skid control ECU)
C1346/71 - Detected only during Test Mode.

  • Brake pedal stroke sensor

  • Brake pedal stroke sensor circuit

WIRING DIAGRAM

A003SGYE04

INSPECTION PROCEDURE

Note

When replacing the brake booster with master cylinder (skid control ECU) or brake pedal stroke sensor, perform initialization and calibration of the linear solenoid valve Click here.

Tech Tips

Check the condition of each related circuit connector before troubleshooting Click here.

PROCEDURE


  1. CHECK BRAKE PEDAL


    1. Check that the brake pedal and the brake pedal stroke sensor are properly installed and that the pedal can be operated normally.

    2. Check and adjust the brake pedal height Click here for LHD or Click here for RHD).

    3. Adjust the brake pedal stroke sensor Click here.


    NEXT

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE PEDAL STROKE SENSOR)


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

    2. Disconnect the skid control ECU connector and the brake pedal stroke sensor connector.

    3. Check both the connector case and the terminal for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A104-39 (VCSK) - A100-3 (VCSK) Always Below 1 Ω
      A104-39 (VCSK) - Body ground Always 10 kΩ or higher
      A104-41 (SKG) - A100-1 (SKG) Always Below 1 Ω
      A104-41 (SKG) - Body ground Always 10 kΩ or higher
      A104-42 (SKS) - A100-4 (SKS1) Always Below 1 Ω
      A104-42 (SKS) - Body ground Always 10 kΩ or higher
      A104-40 (SKS2) - A100-2 (SKS2) Always Below 1 Ω
      A104-40 (SKS2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A104-39 (VCSK) - A100-3 (VCSK) Always Below 1 Ω
      A104-39 (VCSK) - Body ground Always 10 kΩ or higher
      A104-41 (SKG) - A100-1 (SKG) Always Below 1 Ω
      A104-41 (SKG) - Body ground Always 10 kΩ or higher
      A104-42 (SKS) - A100-2 (SKS1) Always Below 1 Ω
      A104-42 (SKS) - Body ground Always 10 kΩ or higher
      A104-40 (SKS2) - A100-4 (SKS2) Always Below 1 Ω
      A104-40 (SKS2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    1. A003S4BE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Pedal Stroke Sensor)

      Reconnect the skid control ECU connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A100-3 (VCSK) - A100-1 (SKG) Power switch on (IG) 4.84 to 5.16 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    A

    REPLACE BRAKE PEDAL STROKE SENSOR Click here