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 assembly.

DTC C1346/71 will be cleared when the brake pedal stroke sensor assembly 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 4.7 V or less or 5.4 V or more for at least 0.2 seconds.

  • Brake pedal stroke sensor assembly

  • Brake pedal stroke sensor power supply

  • Skid control ECU assembly
↑ 172 Ratio of sensor output voltage 1 (SKS) to sensor power source voltage (VCSK) is less than 6% or 90% or more for at least 0.2 seconds.

  • Brake pedal stroke sensor assembly

  • 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 A power source related malfunction other than INF codes 171, 172, 173, 174, 175, 182, or 183 occurs. ↑
↑ 182 Difference between sensor output voltage 1 (SKS) and sensor output voltage 2 (SKS2) differs. ↑
↑ 183 Compared to sensor output voltage 1 (SKS) 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 assembly

  • Brake pedal stroke sensor circuit

  • Brake actuator assembly
C1392/48 -

Zero point calibration of stroke sensor is unfinished.

(When a normal stroke sensor zero point calibration value is not stored.)

 Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete)
C1346/71 - Detected only during Test Mode.

  • Brake pedal stroke sensor assembly

  • Brake pedal stroke sensor circuit

WIRING DIAGRAM

A01FQ1AE07

INSPECTION PROCEDURE

Note

When replacing the skid control ECU assembly, brake pedal stroke sensor assembly or brake actuator 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 operated 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 ASSEMBLY - 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 A15 skid control ECU assembly connector and the A4 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
      for LHD
      Tester Connection Condition Specified Condition
      A15-5 (VCSK) - A4-3 (VCSK) Always Below 1 Ω
      A15-5 (VCSK) - Body ground Always 10 kΩ or higher
      A15-4 (SKG) - A4-1 (SKG) Always Below 1 Ω
      A15-4 (SKG) - Body ground Always 10 kΩ or higher
      A15-3 (SKS) - A4-4 (SKS1) Always Below 1 Ω
      A15-3 (SKS) - Body ground Always 10 kΩ or higher
      A15-1 (SKS2) - A4-2 (SKS2) Always Below 1 Ω
      A15-1 (SKS2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A15-5 (VCSK) - A4-3 (VCSK) Always Below 1 Ω
      A15-5 (VCSK) - Body ground Always 10 kΩ or higher
      A15-4 (SKG) - A4-1 (SKG) Always Below 1 Ω
      A15-4 (SKG) - Body ground Always 10 kΩ or higher
      A15-3 (SKS) - A4-2 (SKS1) Always Below 1 Ω
      A15-3 (SKS) - Body ground Always 10 kΩ or higher
      A15-1 (SKS2) - A4-4 (SKS2) Always Below 1 Ω
      A15-1 (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 assembly connector and the brake pedal stroke sensor assembly 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. A01FS7OE15
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Pedal Stroke Sensor Assembly)

      Turn the power switch off.

    2. Disconnect the brake pedal stroke sensor assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A4-3 (VCSK) - A4-1 (SKG) Power switch on (IG) 4.5 to 5.5 V

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

    OK

  6. READ VALUE USING GTS (BRAKE PEDAL STROKE SENSOR)


    1. Turn the power switch off.

    2. Reconnect the brake pedal stroke sensor assembly connector.

    3. Mount a pedal effort gauge Click here.

    4. Connect the GTS to the DLC3.

    5. Turn the power switch on (IG).

    6. Select the Data List on the GTS Click here.

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

      Brake pedal stroke sensor 1 /

      Min.: 0.00 V, Max.: 5.00 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.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      3.8 to 4.2 V

      		 Reading decreases when brake pedal is depressed

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

      Tech Tips

      The brake pedal must be depressed gradually.

      Standard Voltage
      for 17 inch Front Disc Brake (2GR-FXE)
      except Sport Package
      Brake Effort N (kgf, lbf)

      Stroke Sensor

      (Data List Display)

      Stroke Sensor2

      (Data List Display)
      50 (5, 11.2) 1.36 to 1.76 V 3.21 to 3.61 V
      100 (10, 22.5) 1.55 to 1.95 V 3.02 to 3.42 V
      150 (15, 33.7) 1.69 to 2.09 V 2.88 to 3.28 V
      200 (20, 45.0) 1.76 to 2.16 V 2.81 to 3.21 V
      for 17 inch Front Disc Brake for (2GR-FXE)
      for Sport Package
      Brake Effort N (kgf, lbf)

      Stroke Sensor

      (Data List Display)

      Stroke Sensor2

      (Data List Display)
      50 (5, 11.2) 1.36 to 1.76 V 3.22 to 3.62 V
      100 (10, 22.5) 1.55 to 1.95 V 3.02 to 3.42 V
      150 (15, 33.7) 1.68 to 2.08 V 2.89 to 3.29 V
      200 (20, 45.0) 1.76 to 2.16 V 2.81 to 3.21 V
      for 17 inch Front Disc Brake for (2AR-FSE)
      Front Disc Brake Pad (Type A) / Rear Disc Brake Pad (Type A)
      Brake Effort N (kgf, lbf)

      Stroke Sensor

      (Data List Display)

      Stroke Sensor2

      (Data List Display)
      50 (5, 11.2) 1.36 to 1.76 V 3.21 to 3.61 V
      100 (10, 22.5) 1.52 to 1.92 V 3.05 to 3.45 V
      150 (15, 33.7) 1.67 to 2.07 V 2.90 to 3.30 V
      200 (20, 45.0) 1.75 to 2.15 V 2.81 to 3.21 V
      for 17 inch Front Disc Brake for (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type B)
      Brake Effort N (kgf, lbf)

      Stroke Sensor

      (Data List Display)

      Stroke Sensor2

      (Data List Display)
      50 (5, 11.2) 1.36 to 1.76 V 3.20 to 3.60 V
      100 (10, 22.5) 1.51 to 1.91 V 3.06 to 3.46 V
      150 (15, 33.7) 1.66 to 2.06 V 2.90 to 3.30 V
      200 (20, 45.0) 1.74 to 2.14 V 2.82 to 3.22 V
      for 17 inch Front Disc Brake for (2AR-FSE)
      Front Disc Brake Pad (Type B) / Rear Disc Brake Pad (Type A)
      Brake Effort N (kgf, lbf)

      Stroke Sensor

      (Data List Display)

      Stroke Sensor2

      (Data List Display)
      50 (5, 11.2) 1.37 to 1.77 V 3.20 to 3.60 V
      100 (10, 22.5) 1.51 to 1.91 V 3.05 to 3.45 V
      150 (15, 33.7) 1.66 to 2.06 V 2.91 to 3.31 V
      200 (20, 45.0) 1.75 to 2.15 V 2.81 to 3.21 V
      for 18 inch Front Disc Brake
      Brake Effort N (kgf, lbf)

      Stroke Sensor

      (Data List Display)

      Stroke Sensor2

      (Data List Display)
      50 (5, 11.2) 1.37 to 1.77 V 3.21 to 3.61 V
      100 (10, 22.5) 1.55 to 1.95 V 3.02 to 3.42 V
      150 (15, 33.7) 1.69 to 2.09 V 2.88 to 3.28 V
      200 (20, 45.0) 1.76 to 2.16 V 2.81 to 3.21 V

      Tech Tips

      Refer to the on-vehicle inspection for the brake stroke simulator cylinder for details about the pad shapes and which pad combinations to use for the 17 inch front disc brake for vehicles with a 2AR-FSE engine Click here.


    NG

    REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY Click here

    OK

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


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

    2. Disconnect the A14 and A16 skid control ECU assembly connectors and the A12 brake actuator assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A14-27 (VCM) - A12-35 (VCM) Always Below 1 Ω
      A14-27 (VCM) - Body ground Always 10 kΩ or higher
      A14-26 (PAC1) - A12-46 (PAC1) Always Below 1 Ω
      A14-26 (PAC1) - Body ground Always 10 kΩ or higher
      A14-14 (PMC1) - A12-38 (PMC1) Always Below 1 Ω
      A14-14 (PMC1) - Body ground Always 10 kΩ or higher
      A14-28 (E) - A12-45 (E) Always Below 1 Ω
      A14-28 (E) - Body ground Always 10 kΩ or higher
      A14-9 (PCK1) - A12-37 (PCK1) Always Below 1 Ω
      A14-9 (PCK1) - Body ground Always 10 kΩ or higher
      A16-28 (VCM2) - A12-40 (VCM2) Always Below 1 Ω
      A16-28 (VCM2) - Body ground Always 10 kΩ or higher
      A16-14 (PMC2) - A12-43 (PMC2) Always Below 1 Ω
      A16-14 (PMC2) - Body ground Always 10 kΩ or higher
      A16-44 (E2) - A12-44 (E2) Always Below 1 Ω
      A16-44 (E2) - Body ground Always 10 kΩ or higher
      A16-7 (PCK2) - A12-42 (PCK2) Always Below 1 Ω
      A16-7 (PCK2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A14-27 (VCM) - A12-10 (VCM) Always Below 1 Ω
      A14-27 (VCM) - Body ground Always 10 kΩ or higher
      A14-26 (PAC1) - A12-15 (PAC1) Always Below 1 Ω
      A14-26 (PAC1) - Body ground Always 10 kΩ or higher
      A14-14 (PMC1) - A12-13 (PMC1) Always Below 1 Ω
      A14-14 (PMC1) - Body ground Always 10 kΩ or higher
      A14-28 (E) - A12-14 (E) Always Below 1 Ω
      A14-28 (E) - Body ground Always 10 kΩ or higher
      A14-9 (PCK1) - A12-12 (PCK1) Always Below 1 Ω
      A14-9 (PCK1) - Body ground Always 10 kΩ or higher
      A16-28 (VCM2) - A12-5 (VCM2) Always Below 1 Ω
      A16-28 (VCM2) - Body ground Always 10 kΩ or higher
      A16-14 (PMC2) - A12-8 (PMC2) Always Below 1 Ω
      A16-14 (PMC2) - Body ground Always 10 kΩ or higher
      A16-44 (E2) - A12-16 (E2) Always Below 1 Ω
      A16-44 (E2) - Body ground Always 10 kΩ or higher
      A16-7 (PCK2) - A12-7 (PCK2) Always Below 1 Ω
      A16-7 (PCK2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. READ VALUE USING GTS (WHEEL CYLINDER PRESSURE SENSOR)


    1. Reconnect the skid control ECU assembly connectors and the brake actuator assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Select the Data List on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Master Cylinder Sensor Master cylinder pressure sensor 1 / Min.: 0.00 V, Max.: 5.00 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.: 0.00 V, Max.: 5.00 V

      When brake pedal is released:

      0.3 to 0.7 V

      		 Reading increases when brake pedal is depressed
      ECB* Solenoid (SMC1) Master cut solenoid (SMC1) / ON or OFF

      ON: Operating

      OFF: Not operating

      		 -
      ECB* Solenoid (SMC2) Master cut solenoid (SMC2) / ON or OFF

      ON: Operating

      OFF: Not operating

      		 -

      • *: Electronically Controlled Brake System

    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.


    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    REPLACE SKID CONTROL ECU ASSEMBLY Click here