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

DTC Code Information 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 circuit

  • 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 6% 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 6% 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 Output 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
C1392/48 - Zero point calibration of stroke sensor is unfinished.

  • Brake pedal stroke sensor zero point calibration undone (initialization of linear solenoid valve and calibration undone)

  • Skid control ECU
C1346/71 - Detected only during test mode. Brake pedal stroke sensor installation

WIRING DIAGRAM

A01GHZOE03

INSPECTION PROCEDURE

Note

When replacing the skid control ECU or brake pedal stroke sensor, perform initialization of linear solenoid valve and calibration 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.

      OK
      The brake pedal is securely installed and can be operated normally

    2. for LHD:

      Check the brake pedal height Click here.

      for RHD:

      Check the brake pedal height Click here.

      OK
      The pedal height is within the specified range.

    NG

    ADJUST BRAKE PEDAL

    OK

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Select the Data List mode on the intelligent tester.

      Skid control ECU:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stroke Sensor

      Stroke sensor /

      min.: 0.00 V, max.: 5.00 V

      When brake pedal is released:

      0.70 to 1.30 V

      		 -
      Stroke Sensor2

      Stroke sensor 2 /

      min.: 0.00 V, max.: 5.00 V

      When brake pedal is released:

      3.70 to 4.30 V

      		 -

    4. Read the pedal stroke sensor voltage value on the intelligent tester screen.

      Result
      Result Proceed to

      OK

      (The normal condition value is displayed on the intelligent tester)

      		 A

      for LHD:

      NG

      		 B

      for RHD:

      NG

      		 C

    B

    ADJUST BRAKE PEDAL STROKE SENSOR ASSEMBLY (for LHD) Click here

    C

    ADJUST BRAKE PEDAL STROKE SENSOR ASSEMBLY (for RHD) Click here

    A

  3. PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION


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


    NEXT

  4. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch on (IG).

    3. Check if the same DTCs are recorded Click here.

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

    B

    END

    A

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


    1. Disconnect the A20 ECU connector.

    2. Disconnect the A78 sensor connector.

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

      Standard resistance
      for LHD:
      Tester Connection Condition Specified Condition
      A20-1 (SKS2) - A78-2 (SKS2) Always Below 1 Ω
      A20-3 (SKS) - A78-4 (SKS1) Always Below 1 Ω
      A20-4 (SKG) - A78-1 (SKG) Always Below 1 Ω
      A20-5 (VCSK) - A78-3 (VCSK) Always Below 1 Ω
      A20-1 (SKS2) - Body ground Always 10 kΩ or higher
      A20-3 (SKS) - Body ground Always 10 kΩ or higher
      A20-4 (SKG) - Body ground Always 10 kΩ or higher
      A20-5 (VCSK) - Body ground Always 10 kΩ or higher
      for RHD:
      Tester Connection Condition Specified Condition
      A20-1 (SKS2) - A78-4 (SKS2) Always Below 1 Ω
      A20-3 (SKS) - A78-2 (SKS1) Always Below 1 Ω
      A20-4 (SKG) - A78-1 (SKG) Always Below 1 Ω
      A20-5 (VCSK) - A78-3 (VCSK) Always Below 1 Ω
      A20-1 (SKS2) - Body ground Always 10 kΩ or higher
      A20-3 (SKS) - Body ground Always 10 kΩ or higher
      A20-4 (SKG) - Body ground Always 10 kΩ or higher
      A20-5 (VCSK) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT SKID CONTROL ECU (SENSOR INPUT VOLTAGE)


    1. A01GNTME25

      Reconnect the A20 ECU connector.

    2. Disconnect the A78 sensor connector.

    3. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A78-3 (VCSK) - A78-1 (SKG) Engine switch on (IG) 4.5 to 5.5 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE SKID CONTROL ECU (for LHD) Click here

    C

    REPLACE SKID CONTROL ECU (for RHD) Click here

    A

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


    1. Connect the brake pedal effort gauge.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Select the Data List mode on the intelligent tester.

      Skid control ECU:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stroke Sensor

      Stroke sensor /

      min.: 0.00 V, max.: 5.00 V

      When brake pedal is released:

      0.70 to 1.30 V

      		 -
      Stroke Sensor2

      Stroke sensor 2 /

      min.: 0.00 V, max.: 5.00 V

      When brake pedal is released:

      3.70 to 4.30 V

      		 -

    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 normal.

      Tech Tips

      The brake pedal must be depressed gradually.

      Standard voltage

      Brake Effort

      N (kgf, lbf)

      Stroke Sensor

      (Data List)

      Stroke Sensor 2

      (Data List)
      50 (5.1, 11) 1.04 to 1.44 V 3.52 to 3.92 V
      100 (10.2, 22) 1.13 to 1.53 V 3.38 to 3.78 V
      150 (15.3, 34) 1.27 to 1.67 V 3.29 to 3.69 V
      200 (20.4, 45) 1.34 to 1.74 V 3.22 to 3.62 V

    NG

    REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY Click here

    OK

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


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

    2. Disconnect the A19 and A21 ECU connectors.

    3. Disconnect the A27 actuator connector.

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

      Standard resistance
      for LHD:
      Tester Connection Condition Specified Condition
      A19-27 (VCM) - A27-35 (VCM) Always Below 1 Ω
      A19-27 (VCM) - Body ground Always 10 kΩ or higher
      A19-26 (PAC1) - A27-46 (PAC1) Always Below 1 Ω
      A19-26 (PAC1) - Body ground Always 10 kΩ or higher
      A19-14 (PMC1) - A27-38 (PMC1) Always Below 1 Ω
      A19-14 (PMC1) - Body ground Always 10 kΩ or higher
      A19-28 (E) - A27-45 (E) Always Below 1 Ω
      A19-28 (E) - Body ground Always 10 kΩ or higher
      A19-9 (PCK1) - A27-37 (PCK1) Always Below 1 Ω
      A19-9 (PCK1) - Body ground Always 10 kΩ or higher
      A21-28 (VCM2) - A27-40 (VCM2) Always Below 1 Ω
      A21-28 (VCM2) - Body ground Always 10 kΩ or higher
      A21-14 (PMC2) - A27-43 (PMC2) Always Below 1 Ω
      A21-14 (PMC2) - Body ground Always 10 kΩ or higher
      A21-44 (E2) - A27-44 (E2) Always Below 1 Ω
      A21-44 (E2) - Body ground Always 10 kΩ or higher
      A21-7 (PCK2) - A27-42 (PCK2) Always Below 1 Ω
      A21-7 (PCK2) - Body ground Always 10 kΩ or higher
      for RHD:
      Tester Connection Condition Specified Condition
      A19-27 (VCM) - A27-10 (VCM) Always Below 1 Ω
      A19-27 (VCM) - Body ground Always 10 kΩ or higher
      A19-26 (PAC1) - A27-15 (PAC1) Always Below 1 Ω
      A19-26 (PAC1) - Body ground Always 10 kΩ or higher
      A19-14 (PMC1) - A27-13 (PMC1) Always Below 1 Ω
      A19-14 (PMC1) - Body ground Always 10 kΩ or higher
      A19-28 (E) - A27-14 (E) Always Below 1 Ω
      A19-28 (E) - Body ground Always 10 kΩ or higher
      A19-9 (PCK1) - A27-12 (PCK1) Always Below 1 Ω
      A19-9 (PCK1) - Body ground Always 10 kΩ or higher
      A21-28 (VCM2) - A27-5 (VCM2) Always Below 1 Ω
      A21-28 (VCM2) - Body ground Always 10 kΩ or higher
      A21-14 (PMC2) - A27-8 (PMC2) Always Below 1 Ω
      A21-14 (PMC2) - Body ground Always 10 kΩ or higher
      A21-44 (E2) - A27-16 (E2) Always Below 1 Ω
      A21-44 (E2) - Body ground Always 10 kΩ or higher
      A21-7 (PCK2) - A27-7 (PCK2) Always Below 1 Ω
      A21-7 (PCK2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the A19 and A21 ECU connectors and the A27 actuator connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Select the Data List on the intelligent tester.

      Skid control ECU:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Master Cylinder Sensor Master cylinder pressure sensor 1 reading / Min.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.30 to 0.90 V

      		 Reading increases when brake pedal is depressed
      Master Cylinder Sensor2 Master cylinder pressure sensor 2 reading / Min.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.30 to 0.90 V

      		 Reading increases when brake pedal is depressed
      Electronically Controlled Brake System Solenoid (SMC2) Electronically controlled brake system solenoid (SMC2) / ON or OFF

      ON: Operates

      OFF: Does not operate

      		 -
      Electronically Controlled Brake System Solenoid (SMC1) Electronically controlled brake system solenoid (SMC1) / ON or OFF

      ON: Operates

      OFF: Does not operate

      		 -

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

      OK
      Output voltage is proportional to pedal stroke, and there is not a large difference in output between sensor 1 and sensor 2.

      Tech Tips


      • If DTCs are stored due to the brake pedal being depressed, and electronically controlled brake system control is prohibited, check the Freeze Frame Data recorded at the time the DTCs were stored.

      • If the Freeze Frame Data shows that there are no abnormalities in the output of the master cylinder pressure sensors and no difference in the output between sensor 1 and sensor 2, proceed to the next step.

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (for LHD) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (for RHD) Click here

    A

  10. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Perform the road and braking test.

    3. Check if the same DTCs are recorded Click here.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result
      Result Proceed to
      DTCs (C1247/47 and C1392/48) are not output A
      DTCs (C1247/47 and C1392/48) are output (for LHD) B
      DTCs (C1247/47 and C1392/48) are output (for RHD) C

    B

    REPLACE SKID CONTROL ECU (for LHD) Click here

    C

    REPLACE SKID CONTROL ECU (for RHD) Click here

    A

    END