DTC C1247: Stroke Sensor; DTC C1346: Abnormal Learning of Stroke Sensor Zero Point (Test Mode DTC); DTC C1392: Zero Point Calibration of Stroke Sensor undone [02/2019 - 12/2021]: Procedure

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 PROCEDURE - Step 1

3. Adjust the brake pedal stroke sensor assembly.

   Refer to PROCEDURE - Step 4

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
2. Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
3. Disconnect the A41 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
   A42-39 (VCSK) - A41-3 (VCSK)	Always	Below 1 Ω
   A42-39 (VCSK) or A41-3 (VCSK) - Body ground	Always	10 kΩ or higher
   A42-41 (SKG) - A41-1 (SKG)	Always	Below 1 Ω
   A42-41 (SKG) or A41-1 (SKG) - Body ground	Always	10 kΩ or higher
   A42-42 (SKS) - A41-4 (SKS1)	Always	Below 1 Ω
   A42-42 (SKS) or A41-4 (SKS1) - Body ground	Always	10 kΩ or higher
   A42-40 (SKS2) - A41-2 (SKS2)	Always	Below 1 Ω
   A42-40 (SKS2) or A41-2 (SKS2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Reconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A41-3 (VCSK) - A41-1 (SKG)	Ignition switch ON	4.84 to 5.16 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY. Refer to  REMOVAL [11/2018 - 12/2021] 

Result: 

NG 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]