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Home >> Audi >> 2015 >> A4 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 420 (Electronically Controlled Brake System (Diagnostic Codes & Symptom Tests)) >> Electronically Controlled Brake System >> DTC C1247/47: Stroke Sensor Malfunction; DTC C1346/71: Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC); DTC C1392/48: Stroke Sensor Zero Point Calibration Undone [08/2013 - ] >> Procedure

DTC C1247/47: Stroke Sensor Malfunction; DTC C1346/71: Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC); DTC C1392/48: Stroke Sensor Zero Point Calibration Undone [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  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. Refer to ADJUSTMENT [08/2013 - ] - Step 1 .
    3. Adjust the brake pedal stroke sensor assembly. Refer to INSTALLATION [08/2013 - ] - Step 4 .

    NEXT: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER 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 A24 skid control ECU (brake booster with master cylinder assembly) connector.
    3. Disconnect the A34 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

      Tester Connection Condition Specified Condition
      A24-39 (VCSK) - A34-3 (VCSK) Always Below 1 Ω
      A24-39 (VCSK) - Body ground Always 10 kΩ or higher
      A24-41 (SKG) - A34-1 (SKG) Always Below 1 Ω
      A24-41 (SKG) - Body ground Always 10 kΩ or higher
      A24-42 (SKS) - A34-4 (SKS1) Always Below 1 Ω
      A24-42 (SKS) - Body ground Always 10 kΩ or higher
      A24-40 (SKS2) - A34-2 (SKS2) Always Below 1 Ω
      A24-40 (SKS2) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT) 
    1. Reconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector.
      GTY397820Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A34-3 (VCSK) - A34-1 (SKG) Power switch on (IG) 4.84 to 5.16 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Brake Pedal Stroke Sensor Assembly)

    NG → See step   4 

    OK → See step   5 

  4. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 
  5. REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 
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