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 stroke sensor inputs the pedal stroke into 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
C1247/47 171 Sensor power source voltage (VCSK) is 4.67 V or less or 5.41 V or more for at least 0.2 seconds.

  • Brake pedal stroke sensor

  • Brake pedal stroke sensor power supply

  • Skid control ECU
↑ 172 Ratio of sensor output voltage 1 (SKS1) to sensor power source voltage (VCSK) is less than 5% or 90% or more for at least 0.2 seconds.

  • Brake pedal stroke sensor

  • Brake pedal stroke sensor circuit
↑ 173 Ratio of sensor output voltage 2 (SKS2) to sensor power source voltage (VCSK) is less than 5% or 90% or more for at least 0.2 seconds. ↑
↑ 174 The stroke value converted from the sensor output 1 (SKS1) fluctuates due to noise. ↑
↑ 175 The stroke value converted from the sensor output 2 (SKS2) fluctuates due to noise. ↑
↑ 181 Information code 171, 172, 173, 174, 175, 182 or 183 is not output. ↑
↑ 182 Difference between sensor output voltage 1 (SKS1) and sensor output voltage 2 (SKS2) differs. ↑
↑ 183 Compared to sensor output voltage 1 (SKS1) and sensor output voltage 2 (SKS2), the master cylinder pressure sensor output voltage 1 (PMC1) and master cylinder pressure sensor voltage 2 (PMC2) are low.

  • Brake pedal stroke sensor

  • Brake pedal stroke sensor circuit

  • Brake actuator assembly
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)

  • Skid control ECU
C1346/71 - Detected only during Test Mode.

  • Brake pedal stroke sensor

  • Brake pedal stroke sensor circuit

WIRING DIAGRAM

A01NNENE03

INSPECTION PROCEDURE

Note

When replacing the 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 for LHD, or Click here for RHD).


    NEXT

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


    1. A01NLWCE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2

      Front view of wire harness connector

      (to Brake Pedal Stroke Sensor)
      *3 for LHD
      *4 for RHD

      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
      A91-10 (VCSK) - A109-3 (VCSK) Always Below 1 Ω
      A91-10 (VCSK) - Body ground Always 10 kΩ or higher
      A91-8 (SKG) - A109-1 (SKG) Always Below 1 Ω
      A91-8 (SKG) - Body ground Always 10 kΩ or higher
      A91-20 (SKS) - A109-4 (SKS1) Always Below 1 Ω
      A91-20 (SKS) - Body ground Always 10 kΩ or higher
      A91-22 (SKS2) - A109-2 (SKS2) Always Below 1 Ω
      A91-22 (SKS2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A91-10 (VCSK) - A109-3 (VCSK) Always Below 1 Ω
      A91-10 (VCSK) - Body ground Always 10 kΩ or higher
      A91-8 (SKG) - A109-1 (SKG) Always Below 1 Ω
      A91-8 (SKG) - Body ground Always 10 kΩ or higher
      A91-20 (SKS) - A109-2 (SKS1) Always Below 1 Ω
      A91-20 (SKS) - Body ground Always 10 kΩ or higher
      A91-22 (SKS2) - A109-4 (SKS2) Always Below 1 Ω
      A91-22 (SKS2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE


    1. Reconnect the skid control ECU connector and the brake pedal stroke sensor connector.

    2. Perform initialization and calibration of the linear solenoid valve Click here.


    NEXT

  4. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    3. Perform a road test.

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C1247/47 and/or C1392/48) are output A
      DTCs (C1247/47 and C1392/48) are not output B

    B

    END

    A

  5. INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    1. A01NLKCE25
      Text in Illustration
      *1

      Component with harness connected

      (Skid Control ECU)

      Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A91-10 (VCSK) - Body ground Power switch on (IG) 4.5 to 5.5 V

    3. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A91-8 (SKG) - Body ground Always Below 1 Ω

    NG

    REPLACE SKID CONTROL ECU Click here

    OK

  6. READ VALUE USING INTELLIGENT TESTER (BRAKE PEDAL STROKE SENSOR)


    1. Mount a pedal effort gauge.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stroke Sensor

      Brake pedal stroke sensor /

      Min.: 0 V, Max.: 5 V

      When brake pedal is released:

      0.8 to 1.2 V

      		 Reading increases when brake pedal is depressed
      Stroke Sensor2

      Brake pedal stroke sensor 2 /

      Min.: 0 V, Max.: 5 V

      When brake pedal is released:

      3.8 to 4.2 V

      		 Reading decreases when brake pedal is depressed

    5. When depressing the brake pedal with the amount of force listed in the table below, check that the output value displayed on the intelligent tester is within the standard voltage.

      Tech Tips

      The brake pedal must be depressed gradually.

      Standard Voltage
      Brake Effort N (kgf, lbf)

      Stroke Sensor

      (Data List Display)

      Stroke Sensor2

      (Data List Display)
      50 (5, 11.2) 1.15 to 1.55 V 3.40 to 3.80 V
      100 (10, 22.5) 1.30 to 1.70 V 3.25 to 3.65 V
      150 (15, 33.7) 1.40 to 1.80 V 3.15 to 3.55 V
      200 (20, 45.0) 1.50 to 1.90 V 3.05 to 3.45 V

    NG

    REPLACE BRAKE PEDAL STROKE SENSOR Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)


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

      A01NLHIE12
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

      		 *2

      Front view of wire harness connector

      (to Brake Actuator)

    2. Disconnect the skid control ECU connectors and the brake actuator connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A89-9 (VCM) - A82-35 (VCM) Always Below 1 Ω
      A89-9 (VCM) - Body ground Always 10 kΩ or higher
      A89-21 (PAC1) - A82-46 (PAC1) Always Below 1 Ω
      A89-21 (PAC1) - Body ground Always 10 kΩ or higher
      A89-30 (PMC1) - A82-38 (PMC1) Always Below 1 Ω
      A89-30 (PMC1) - Body ground Always 10 kΩ or higher
      A89-8 (E) - A82-45 (E) Always Below 1 Ω
      A89-8 (E) - Body ground Always 10 kΩ or higher
      A89-31 (PCK1) - A82-37 (PCK1) Always Below 1 Ω
      A89-31 (PCK1) - Body ground Always 10 kΩ or higher
      A92-16 (VCM2) - A82-40 (VCM2) Always Below 1 Ω
      A92-16 (VCM2) - Body ground Always 10 kΩ or higher
      A92-28 (PMC2) - A82-43 (PMC2) Always Below 1 Ω
      A92-28 (PMC2) - Body ground Always 10 kΩ or higher
      A92-15 (E2) - A82-44 (E2) Always Below 1 Ω
      A92-15 (E2) - Body ground Always 10 kΩ or higher
      A92-29 (PCK2) - A82-42 (PCK2) Always Below 1 Ω
      A92-29 (PCK2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    1. A01NLKCE24
      Text in Illustration
      *1

      Component with harness connected

      (Skid Control ECU)

      Reconnect the skid control ECU connectors and the brake actuator 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
      A89-9 (VCM) - Body ground Power switch on (IG) 4.75 to 5.25 V
      A92-16 (VCM2) - Body ground Power switch on (IG) 4.75 to 5.25 V

    4. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A89-8 (E) - Body ground Always Below 1 Ω
      A92-15 (E2) - Body ground Always Below 1 Ω

    NG

    REPLACE SKID CONTROL ECU Click here

    OK

  9. READ VALUE USING INTELLIGENT TESTER (MASTER CYLINDER PRESSURE SENSOR)


    1. Mount a pedal effort gauge.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Master Cylinder Sensor Master cylinder pressure sensor 1 / Min.: 0 V, Max.: 5 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed
      Master Cylinder Sensor2 Master cylinder pressure sensor 2 / Min.: 0 V, Max.: 5 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed

    5. Check the output value of the master cylinder pressure sensor as the brake pedal is depressed.

      Tech Tips


      • Check the value while electronically controlled brake system control is disabled and without servo assistance.

      • The brake warning light / yellow (minor malfunction) is on while electronically controlled brake system control is being disabled.

      Standard Voltage
      Brake Effort N (kgf, lbf)

      Master Cylinder Sensor

      (Data List Display)

      Master Cylinder Sensor2

      (Data List Display)
      200 (20, 45.0) 0.90 to 1.30 V 0.90 to 1.30 V
      500 (51, 112.4) 2.10 to 2.50 V 2.10 to 2.50 V

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    REPLACE SKID CONTROL ECU Click here