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ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1247, C1392

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DTC Code DTC Name
C1247 Stroke Sensor
C1392 Zero Point Calibration of Stroke Sensor undone
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DESCRIPTION

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

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1247 Stroke Sensor

171

172

173

174

175

181

182

183

  • INF Code: 171


    • Sensor supply voltage (VCSK) is 4.7 V or less, or 5.4 V or more for 0.2 seconds or more.

  • INF Code: 172


    • Sensor output voltage 1 (SKS) is 6% or less, or 90% or more of sensor supply voltage (VCSK) for 0.2 seconds or more.

  • INF Code: 173


    • Sensor output voltage 2 (SKS2) is 6% or less, or 90% or more of sensor supply voltage (VCSK) for 0.2 seconds or more.

  • INF Code: 174


    • The stroke value converted from the sensor output 1 (SKS) fluctuates due to noise.

  • INF Code: 175


    • The stroke value converted from the sensor output 2 (SKS2) fluctuates due to noise.

  • INF Code: 181


    • A power source related malfunction other than INF codes 171, 172, 173, 174, 175, 182, or 183 occurs.

  • INF Code: 182


    • Difference between the output voltage of sensor 1 (SKS) and the output voltage of sensor 2 (SKS2) differs.

  • INF Code: 183


    • Compared to the output voltage of sensor 1 (SKS) and sensor 2 (SKS2), the output voltage of master cylinder pressure sensor 1 (PMC1) and master cylinder pressure sensor 2 (PMC2) are low.

  • INF Code: 171


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

    • Improperly connected connector, deformation or corrosion of terminals

    • Skid control ECU assembly

  • INF Code: 172, 173, 174, 175, 181, 182


    • Open or short in wire harness

    • Improperly connected connector, deformation or corrosion of terminals

    • Brake pedal stroke sensor assembly

  • INF Code: 183


    • Open or short in wire harness

    • Improperly connected connector, deformation or corrosion of terminals

    • Brake pedal stroke sensor assembly

    • Brake actuator assembly

 -
C1392 Zero Point Calibration of Stroke Sensor undone - 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) -
Figure 2. for RHD: B004WT0E14
Figure 1. for LHD:
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

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Tip:

Check the condition of each related circuit connector before troubleshooting.

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PROCEDURE


  1. Click here

    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.

      for LHD:Click here

      for RHD:Click here

    3. Adjust the brake pedal stroke sensor assembly.

      for LHD:Click here

      for RHD:Click here

      Result
      Proceed to
      NEXT

  2. Click here

    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 A12 skid control ECU assembly connector.

    3. Disconnect the A2 brake pedal stroke sensor assembly connector.

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

      OK
      No deformation or corrosion.

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

      Standard Resistance
      Table 1. for LHD:
      Tester Connection Condition Specified Condition
      A12-8 (SKG) - A2-1 (SKG) Always Below 1 Ω
      A12-8 (SKG) or A2-1 (SKG) - Body ground Always 10 kΩ or higher
      A12-10 (VCSK) - A2-3 (VCSK) Always Below 1 Ω
      A12-10 (VCSK) or A2-3 (VCSK) - Body ground Always 10 kΩ or higher
      A12-20 (SKS) - A2-2 (SKS1) Always Below 1 Ω
      A12-20 (SKS) or A2-2 (SKS1) - Body ground Always 10 kΩ or higher
      A12-22 (SKS2) - A2-4 (SKS2) Always Below 1 Ω
      A12-22 (SKS2) or A2-4 (SKS2) - Body ground Always 10 kΩ or higher
      Table 2. for RHD:
      Tester Connection Condition Specified Condition
      A12-8 (SKG) - A2-1 (SKG) Always Below 1 Ω
      A12-8 (SKG) or A2-1 (SKG) - Body ground Always 10 kΩ or higher
      A12-10 (VCSK) - A2-3 (VCSK) Always Below 1 Ω
      A12-10 (VCSK) or A2-3 (VCSK) - Body ground Always 10 kΩ or higher
      A12-20 (SKS) - A2-4 (SKS1) Always Below 1 Ω
      A12-20 (SKS) or A2-4 (SKS1) - Body ground Always 10 kΩ or higher
      A12-22 (SKS2) - A2-2 (SKS2) Always Below 1 Ω
      A12-22 (SKS2) or A2-2 (SKS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE


    1. Reconnect the A12 skid control ECU assembly connector.

    2. Reconnect the A2 brake pedal stroke sensor assembly connector.

    3. Perform initialization and calibration of the linear solenoid valve.

      Click here


      1. Chassis > ABS/VSC/TRC > Utility
        Tester Display
        ECB Utility




      ECB: Electronically Controlled Brake System

      Result
      Proceed to
      NEXT

  4. Click here

    RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      1. Chassis > ABS/VSC/TRC > Clear DTCs


    3. Turn the power switch off.

    4. Turn the power switch on (READY).

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Result
      Result Proceed to
      DTCs C1247 and/or C1392 are output. A
      DTCs C1247 and C1392 are not output. B

  5. Click here

    INSPECT SKID CONTROL ECU ASSEMBLY (SENSOR POWER SUPPLY OUTPUT)


    1. B004YC8C26
      *a

      Component with harness connected

      (Skid Control ECU Assembly)

      Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A12-10 (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
      A12-8 (SKG) - Body ground Power switch off Below 1 Ω
      Result
      Proceed to
      OK
      NG

  6. Click here

    READ VALUE USING GTS (BRAKE PEDAL STROKE SENSOR ASSEMBLY)


    1. Mount a pedal effort gauge.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Select the Data List on the GTS.

      Click here


      1. Chassis > ABS/VSC/TRC > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Stroke Sensor Brake pedal stroke sensor assembly 1 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.80 to 1.20 V Reading increases when brake pedal is depressed
        Stroke Sensor2 Brake pedal stroke sensor assembly 2 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 3.80 to 4.20 V Reading decreases when brake pedal is depressed




      1. Chassis > ABS/VSC/TRC > Data List
        Tester Display
        Stroke Sensor
        Stroke Sensor2





    5. 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.

      Tip:

      The brake pedal must be depressed gradually.

      Standard Voltage

      Brake Effort

      N (kgf, lbf)

      Stroke Sensor

      (Tester Display)

      Stroke Sensor2

      (Tester Display)
      50 (5, 11.2) 1.39 to 1.79 V 3.18 to 3.58 V
      100 (10, 22.5) 1.61 to 2.01 V 2.96 to 3.36 V
      150 (15, 33.7) 1.77 to 2.17 V 2.80 to 3.20 V
      200 (20, 45.0) 1.86 to 2.26 V 2.71 to 3.11 V
      Result
      Proceed to
      OK
      NG

  7. Click here

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


    1. Turn the power switch off.

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

    3. Disconnect the A13 and A10 skid control ECU assembly connectors.

    4. Disconnect the A8 brake actuator assembly connector.

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

      Standard Resistance
      Table 3. for LHD:
      Tester Connection Condition Specified Condition
      A10-9 (VCM) - A8-10 (VCM) Always Below 1 Ω
      A10-9 (VCM) or A8-10 (VCM) - Body ground Always 10 kΩ or higher
      A10-21 (PAC1) - A8-15 (PAC1) Always Below 1 Ω
      A10-21 (PAC1) or A8-15 (PAC1) - Body ground Always 10 kΩ or higher
      A10-30 (PMC1) - A8-13 (PMC1) Always Below 1 Ω
      A10-30 (PMC1) or A8-13 (PMC1) - Body ground Always 10 kΩ or higher
      A10-8 (E) - A8-14 (E) Always Below 1 Ω
      A10-8 (E) or A8-14 (E) - Body ground Always 10 kΩ or higher
      A10-31 (PCK1) - A8-12 (PCK1) Always Below 1 Ω
      A10-31 (PCK1) or A8-12 (PCK1) - Body ground Always 10 kΩ or higher
      A13-16 (VCM2) - A8-5 (VCM2) Always Below 1 Ω
      A13-16 (VCM2) or A8-5 (VCM2) - Body ground Always 10 kΩ or higher
      A13-28 (PMC2) - A8-8 (PMC2) Always Below 1 Ω
      A13-28 (PMC2) or A8-8 (PMC2) - Body ground Always 10 kΩ or higher
      A13-15 (E2) - A8-16 (E2) Always Below 1 Ω
      A13-15 (E2) or A8-16 (E2) - Body ground Always 10 kΩ or higher
      A13-29 (PCK2) - A8-7 (PCK2) Always Below 1 Ω
      A13-29 (PCK2) or A8-7 (PCK2) - Body ground Always 10 kΩ or higher
      Table 4. for RHD:
      Tester Connection Condition Specified Condition
      A10-9 (VCM) - A8-35 (VCM) Always Below 1 Ω
      A10-9 (VCM) or A8-35 (VCM) - Body ground Always 10 kΩ or higher
      A10-21 (PAC1) - A8-46 (PAC1) Always Below 1 Ω
      A10-21 (PAC1) or A8-46 (PAC1) - Body ground Always 10 kΩ or higher
      A10-30 (PMC1) - A8-38 (PMC1) Always Below 1 Ω
      A10-30 (PMC1) or A8-38 (PMC1) - Body ground Always 10 kΩ or higher
      A10-8 (E) - A8-45 (E) Always Below 1 Ω
      A10-8 (E) or A8-45 (E) - Body ground Always 10 kΩ or higher
      A10-31 (PCK1) - A8-37 (PCK1) Always Below 1 Ω
      A10-31 (PCK1) or A8-37 (PCK1) - Body ground Always 10 kΩ or higher
      A13-16 (VCM2) - A8-40 (VCM2) Always Below 1 Ω
      A13-16 (VCM2) or A8-40 (VCM2) - Body ground Always 10 kΩ or higher
      A13-28 (PMC2) - A8-43 (PMC2) Always Below 1 Ω
      A13-28 (PMC2) or A8-43 (PMC2) - Body ground Always 10 kΩ or higher
      A13-15 (E2) - A8-44 (E2) Always Below 1 Ω
      A13-15 (E2) or A8-44 (E2) - Body ground Always 10 kΩ or higher
      A13-29 (PCK2) - A8-42 (PCK2) Always Below 1 Ω
      A13-29 (PCK2) or A8-42 (PCK2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    INSPECT SKID CONTROL ECU ASSEMBLY (SENSOR POWER SUPPLY OUTPUT)


    1. B004YC8C27
      *a

      Component with harness connected

      (Skid Control ECU Assembly)

      Reconnect the A13 and A10 skid control ECU assembly connectors.

    2. Reconnect the A8 brake actuator assembly connector.

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A10-9 (VCM) - Body ground Power switch on (IG) 4.75 to 5.25 V
      A13-16 (VCM2) - Body ground Power switch on (IG) 4.75 to 5.25 V

    5. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A10-8 (E) - Body ground Power switch off Below 1 Ω
      A13-15 (E2) - Body ground Power switch off Below 1 Ω
      Result
      Proceed to
      OK
      NG

  9. Click here

    READ VALUE USING GTS (MASTER CYLINDER PRESSURE SENSOR)


    1. Mount a pedal effort gauge.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Select the Data List on the GTS.

      Click here


      1. Chassis > ABS/VSC/TRC > Data List
        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 Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
        Master Cylinder Sensor2 Master cylinder pressure sensor 2 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
        ECB Solenoid (SMC1) Master cut solenoid (SMC1) ON or OFF

        ON: Solenoid on (valve closed)

        OFF: Solenoid off (valve open)

        		 ECB: Electronically Controlled Brake System
        ECB Solenoid (SMC2) Master cut solenoid (SMC2) ON or OFF

        ON: Solenoid on (valve closed)

        OFF: Solenoid off (valve open)

        		 ECB: Electronically Controlled Brake System






      1. Chassis > ABS/VSC/TRC > Data List
        Tester Display
        Master Cylinder Sensor
        Master Cylinder Sensor2
        ECB Solenoid (SMC1)
        ECB Solenoid (SMC2)







      ECB: 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.
      Tip:

      • 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 difference in the output between sensor 1 and sensor 2, proceed to the next step.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE SKID CONTROL ECU ASSEMBLY for LHD:Click here

      REPLACE SKID CONTROL ECU ASSEMBLY for RHD:Click here

    • NG

      REPLACE BRAKE ACTUATOR ASSEMBLY for LHD:Click here

      REPLACE BRAKE ACTUATOR ASSEMBLY for RHD:Click here