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 assembly sends a signal about the pedal stroke to the skid control ECU.

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

DTC No. 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 assembly power supply circuit

  • Improperly connected connector, deformation or corrosion of terminals

  • Skid control ECU (Brake booster with master cylinder assembly)
↑ 212 Sensor output voltage 1 (SKS1) is less than 5.5%, or 94% or more (less than 0.27 V, or 4.7 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 assembly
↑ 213 Sensor output voltage 2 (SKS2) is less than 5.5%, or 94% or more (less than 0.27 V, or 4.7 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.

 ↑
↑ 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.)

 ↑
↑ 223

Sensor data is invalid for 0.2 seconds or more.

(Open, short, or noise.)

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

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

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

  • Brake pedal stroke sensor assembly

  • Brake pedal stroke sensor assembly circuit

WIRING DIAGRAM

A01HVT3E07

INSPECTION PROCEDURE

Note

When replacing the skid control ECU (brake booster with master cylinder assembly) or brake pedal stroke sensor assembly, 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 assembly are properly installed and that the pedal can be depressed normally.

    2. Check and adjust the brake pedal height Click here.

    3. Adjust the brake pedal stroke sensor assembly Click here.


    NEXT

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


    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 (brake booster with master cylinder assembly) connector and the brake pedal stroke sensor assembly 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
      Tester Connection Condition Specified Condition
      A28-39 (VCSK) - A41-3 (VCSK) Always Below 1 Ω
      A28-39 (VCSK) - Body ground Always 10 kΩ or higher
      A28-41 (SKG) - A41-1 (SKG) Always Below 1 Ω
      A28-41 (SKG) - Body ground Always 10 kΩ or higher
      A28-42 (SKS) - A41-4 (SKS1) Always Below 1 Ω
      A28-42 (SKS) - Body ground Always 10 kΩ or higher
      A28-40 (SKS2) - A41-2 (SKS2) Always Below 1 Ω
      A28-40 (SKS2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    1. A01HUF0E04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Pedal Stroke Sensor Assembly)

      Reconnect the skid control ECU (brake booster with master cylinder assembly) 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 Condition Specified Condition
      A41-3 (VCSK) - A41-1 (SKG) Power switch on (IG) 4.84 to 5.16 V

    NG

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    OK

    REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY Click here