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 assembly.

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. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1247/47 Stroke Sensor Malfunction

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 less than 6%, or 90% or more of sensor supply voltage (VCSK) for 0.2 seconds or more.

  • INF Code: 173


    • Sensor output voltage 2 (SKS2) is less than 6%, 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

 Electronically controlled brake system DTC
C1346/71 Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC) - Detected only during Test Mode.

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

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Brake pedal stroke sensor assembly

 Electronically controlled brake system Test Mode DTC
C1392/48 Stroke Sensor Zero Point Calibration 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) Electronically controlled brake system DTC

WIRING DIAGRAM

A0022M5E04

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.

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.

      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

    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 A26 skid control ECU assembly connector.

    3. Disconnect the A53 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
      for LHD
      Tester Connection Condition Specified Condition
      A26-4 (SKG) - A53-1 (SKG) Always Below 1 Ω
      A26-4 (SKG) or A53-1 (SKG) - Body ground Always 10 kΩ or higher
      A26-5 (VCSK) - A53-3 (VCSK) Always Below 1 Ω
      A26-5 (VCSK) or A53-3 (VCSK) - Body ground Always 10 kΩ or higher
      A26-3 (SKS) - A53-4 (SKS1) Always Below 1 Ω
      A26-3 (SKS) or A53-4 (SKS1) - Body ground Always 10 kΩ or higher
      A26-1 (SKS2) - A53-2 (SKS2) Always Below 1 Ω
      A26-1 (SKS2) or A53-2 (SKS2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A26-4 (SKG) - A53-1 (SKG) Always Below 1 Ω
      A26-4 (SKG) or A53-1 (SKG) - Body ground Always 10 kΩ or higher
      A26-5 (VCSK) - A53-3 (VCSK) Always Below 1 Ω
      A26-5 (VCSK) or A53-3 (VCSK) - Body ground Always 10 kΩ or higher
      A26-3 (SKS) - A53-2 (SKS1) Always Below 1 Ω
      A26-3 (SKS) or A53-2 (SKS1) - Body ground Always 10 kΩ or higher
      A26-1 (SKS2) - A53-4 (SKS2) Always Below 1 Ω
      A26-1 (SKS2) or A53-4 (SKS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE


    1. Reconnect the A26 skid control ECU assembly connector.

    2. Reconnect the A53 brake pedal stroke sensor assembly connector.

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

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      ECB Utility
      Result
      Proceed to
      NEXT

    NEXT

  4. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (IG).

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      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 ASSEMBLY (SENSOR POWER SUPPLY OUTPUT)


    1. A00211QC12
      *a

      Front view of wire harness connector

      (to Brake Pedal Stroke Sensor Assembly)

      Turn the power switch off.

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

    3. Disconnect the A53 brake pedal stroke sensor assembly connector.

    4. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A53-3 (VCSK) - A53-1 (SKG) Power switch on (IG) 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    OK

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


    1. Turn the power switch off.

    2. Reconnect the A53 brake pedal stroke sensor assembly connector.

    3. Mount a pedal effort gauge.

    4. Connect the GTS to the DLC3.

    5. Turn the power switch on (IG).

    6. Select the Data List on the GTS.

      Click here


      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

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

    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

      Brake Effort

      N (kgf, lbf)

      Stroke Sensor

      (Tester Display)

      Stroke Sensor2

      (Tester Display)
      50 (5, 11.2) 1.39 to 1.79 V 3.17 to 3.57 V
      100 (10, 22.5) 1.56 to 1.96 V 3.01 to 3.41 V
      150 (15, 33.7) 1.71 to 2.11 V 2.85 to 3.25 V
      200 (20, 45.0) 1.78 to 2.18 V 2.78 to 3.18 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY for RHD: Click here

    OK

  7. 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 A24 and A25 skid control ECU assembly connectors.

    4. Disconnect the A16 brake actuator assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A24-27 (VCM) - A16-35 (VCM) Always Below 1 Ω
      A24-27 (VCM) or A16-35 (VCM) - Body ground Always 10 kΩ or higher
      A24-26 (PAC1) - A16-46 (PAC1) Always Below 1 Ω
      A24-26 (PAC1) or A16-46 (PAC1) - Body ground Always 10 kΩ or higher
      A24-14 (PMC1) - A16-38 (PMC1) Always Below 1 Ω
      A24-14 (PMC1) or A16-38 (PMC1) - Body ground Always 10 kΩ or higher
      A24-28 (E) - A16-45 (E) Always Below 1 Ω
      A24-28 (E) or A16-45 (E) - Body ground Always 10 kΩ or higher
      A24-9 (PCK1) - A16-37 (PCK1) Always Below 1 Ω
      A24-9 (PCK1) or A16-37 (PCK1) - Body ground Always 10 kΩ or higher
      A25-28 (VCM2) - A16-40 (VCM2) Always Below 1 Ω
      A25-28 (VCM2) or A16-40 (VCM2) - Body ground Always 10 kΩ or higher
      A25-14 (PMC2) - A16-43 (PMC2) Always Below 1 Ω
      A25-14 (PMC2) or A16-43 (PMC2) - Body ground Always 10 kΩ or higher
      A25-44 (E2) - A16-44 (E2) Always Below 1 Ω
      A25-44 (E2) or A16-44 (E2) - Body ground Always 10 kΩ or higher
      A25-7 (PCK2) - A16-42 (PCK2) Always Below 1 Ω
      A25-7 (PCK2) or A16-42 (PCK2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A24-27 (VCM) - A16-10 (VCM) Always Below 1 Ω
      A24-27 (VCM) or A16-10 (VCM) - Body ground Always 10 kΩ or higher
      A24-26 (PAC1) - A16-15 (PAC1) Always Below 1 Ω
      A24-26 (PAC1) or A16-15 (PAC1) - Body ground Always 10 kΩ or higher
      A24-14 (PMC1) - A16-13 (PMC1) Always Below 1 Ω
      A24-14 (PMC1) or A16-13 (PMC1) - Body ground Always 10 kΩ or higher
      A24-28 (E) - A16-14 (E) Always Below 1 Ω
      A24-28 (E) or A16-14 (E) - Body ground Always 10 kΩ or higher
      A24-9 (PCK1) - A16-12 (PCK1) Always Below 1 Ω
      A24-9 (PCK1) or A16-12 (PCK1) - Body ground Always 10 kΩ or higher
      A25-28 (VCM2) - A16-5 (VCM2) Always Below 1 Ω
      A25-28 (VCM2) or A16-5 (VCM2) - Body ground Always 10 kΩ or higher
      A25-14 (PMC2) - A16-8 (PMC2) Always Below 1 Ω
      A25-14 (PMC2) or A16-8 (PMC2) - Body ground Always 10 kΩ or higher
      A25-44 (E2) - A16-16 (E2) Always Below 1 Ω
      A25-44 (E2) or A16-16 (E2) - Body ground Always 10 kΩ or higher
      A25-7 (PCK2) - A16-7 (PCK2) Always Below 1 Ω
      A25-7 (PCK2) or A16-7 (PCK2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the A24 and A25 skid control ECU assembly connectors.

    2. Reconnect the A16 brake actuator assembly connector.

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

    5. Select the Data List on the GTS.

      Click here


      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

      OFF: Solenoid off

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

      ON: Solenoid on

      OFF: Solenoid off

      		 ECB: Electronically Controlled Brake System

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

    6. 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 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