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: Procedure

1. Check that the brake pedal and the brake pedal stroke sensor are properly installed and that the pedal can be operated normally.
2. Check and adjust the brake pedal height, refer to ADJUSTMENT .
3. Adjust the brake pedal stroke sensor, refer to ADJUSTMENT .

NEXT: Go to next step 

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
   Fig 1: Identifying Skid Control ECU And Brake Pedal Stroke Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A47 skid control ECU connector and the brake pedal stroke sensor 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

   Tester Connection	Condition	Specified Condition
   A47-10 (VCSK) - A50-3 (VCSK)	Always	Below 1 Ω
   A47-10 (VCSK) - Body ground	Always	10 kΩ or higher
   A47-8 (SKG) - A50-1 (SKG)	Always	Below 1 Ω
   A47-8 (SKG) - Body ground	Always	10 kΩ or higher
   A47-20 (SKS) - A50-4 (SKS1)	Always	Below 1 Ω
   A47-20 (SKS) - Body ground	Always	10 kΩ or higher
   A47-22 (SKS2) - A50-2 (SKS2)	Always	Below 1 Ω
   A47-22 (SKS2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Skid Control ECU)
   *2	Front view of wire harness connector (to Brake Pedal Stroke Sensor)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU connector and the brake pedal stroke sensor connector.
2. Perform initialization and calibration of the linear solenoid valve, refer to INITIALIZATION .

NEXT: Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs, refer to DTC CHECK / CLEAR .
3. Perform a road test.
4. Check if the same DTC is recorded, refer to DTC CHECK / CLEAR .

   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: Go to next step 

1. Turn the ignition switch to ON.
   Fig 2: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A47-10 (VCSK) - Body ground	Ignition switch ON	3.75 to 4.95 V

3. Turn the ignition switch off.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A47-8 (SKG) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Skid Control ECU)

NG → See step   7 

OK: Go to next step 

1. Connect a pedal effort gauge.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Select the Data List on the Techstream, refer to DATA LIST / ACTIVE TEST .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stroke Sensor	Brake pedal stroke sensor / 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

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

   HINT: 

   The brake pedal must be depressed gradually.

   Standard Voltage

   Brake Effort N (kgf, lbf)	Stroke Sensor (Data List Display)	Stroke Sensor2 (Data List Display)
   50 (5, 11.2)	1.15 to 1.55 V	3.40 to 3.80 V
   100 (10, 22.5)	1.30 to 1.70 V	3.25 to 3.65 V
   150 (15, 33.7)	1.40 to 1.80 V	3.15 to 3.55 V
   200 (20, 45.0)	1.50 to 1.90 V	3.05 to 3.45 V

NG → See step   8 

OK → See step   7