ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1247/47, C1346/71, C1392/48

DESCRIPTION

The stroke sensor inputs the pedal stroke into the skid control ECU.

DTC C1346/71 will be cleared when the brake pedal stroke sensor sends a stroke sensor signal or when Test Mode ends. DTC C1346/71 is output only in Test Mode.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK BRAKE PEDAL

   
   

   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 Click here for LHD, or Click here for RHD).

   3. Adjust the brake pedal stroke sensor Click here for LHD, or Click here for RHD).

   
   

   NEXT

2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE PEDAL STROKE SENSOR)

   
   
   1. 

      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)
      *3	for RHD
      *4	for LHD

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

   2. Disconnect the 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
      for RHD Tester Connection Condition Specified Condition A91-10 (VCSK) - A88-3 (VCSK) Always Below 1 Ω A91-10 (VCSK) - Body ground Always 10 kΩ or higher A91-8 (SKG) - A88-1 (SKG) Always Below 1 Ω A91-8 (SKG) - Body ground Always 10 kΩ or higher A91-20 (SKS) - A88-2 (SKS1) Always Below 1 Ω A91-20 (SKS) - Body ground Always 10 kΩ or higher A91-22 (SKS2) - A88-4 (SKS2) Always Below 1 Ω A91-22 (SKS2) - Body ground Always 10 kΩ or higher
      for LHD Tester Connection Condition Specified Condition A91-10 (VCSK) - A88-3 (VCSK) Always Below 1 Ω A91-10 (VCSK) - Body ground Always 10 kΩ or higher A91-8 (SKG) - A88-1 (SKG) Always Below 1 Ω A91-8 (SKG) - Body ground Always 10 kΩ or higher A91-20 (SKS) - A88-4 (SKS1) Always Below 1 Ω A91-20 (SKS) - Body ground Always 10 kΩ or higher A91-22 (SKS2) - A88-2 (SKS2) Always Below 1 Ω A91-22 (SKS2) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE

   
   

   1. Reconnect the skid control ECU connector and the brake pedal stroke sensor connector.

   2. Perform initialization and calibration of the linear solenoid valve Click here.

   
   

   NEXT

4. RECONFIRM DTC

   
   

   1. Turn the power switch off.

   2. Clear the DTCs Click here.

   3. Perform a road test.

   4. Check if the same DTC is recorded Click here.

      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 (SENSOR OUTPUT)

   
   
   1. 

      Text in Illustration

      *1	Component without harness connected (Skid Control ECU)

      Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition A91-10 (VCSK) - Body ground Power switch on (IG) 3.75 to 4.95 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 A91-8 (SKG) - Body ground Always Below 1 Ω

   
   

   NG

   REPLACE SKID CONTROL ECU Click here

   OK

6. READ VALUE USING INTELLIGENT TESTER (BRAKE PEDAL STROKE SENSOR)

   
   

   1. Connect a pedal effort gauge Click here for LHD, or Click here for RHD).

   2. Connect the intelligent tester to the DLC3.

   3. Turn the power switch on (IG).

   4. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Stroke Sensor	Brake pedal stroke sensor / Min.: 0 V, Max.: 5 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 V, Max.: 5 V	When brake pedal is released: 3.8 to 4.2 V	Reading increases 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 intelligent tester is within the standard voltage.

      Tech Tips

      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

   REPLACE BRAKE PEDAL STROKE SENSOR Click here

   OK

   REPLACE SKID CONTROL ECU Click here