C1247

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1247/47,C1346/71,C1392/48: Stroke Sensor Malfunction

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

DESCRIPTION

The stroke sensor inputs the pedal stroke into the skid control ECU.
DTC C1346/71 can be deleted when the brake pedal stroke sensor sends a stroke sensor signal or the Test Mode ends. DTC C1346/71 is output only in the Test Mode.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE: When replacing the skid control ECU or brake pedal stroke sensor, perform initialization of linear solenoid valve and calibration Initialization.
HINT: Check the condition of each related circuit connector before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. CHECK BRAKE PEDAL
(a) Check that the brake pedal and the brake pedal stroke sensor are properly installed and that the pedal can be operated normally.
(b) Check and adjust the brake pedal height Adjustments.
(c) Adjust the brake pedal stroke sensor Adjustments.
NEXT -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE PEDAL STROKE SENSOR)




(a) Confirm that the skid control ECU connector and the brake pedal stroke sensor connector connected.
(b) Disconnect the skid control ECU connector and the brake pedal stroke sensor connector.
(c) Check both the connector case and the terminal for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION
(a) Reconnect the skid control ECU connector and the brake pedal stroke sensor connector.
(b) Perform initialization of the linear solenoid valve and calibration Initialization.
NEXT -- Continue to next step.
4. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(c) Perform a road test.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- Continue to next step.
5. INSPECT SKID CONTROL ECU (SENSOR INPUT)




(a) Turn the power switch on (IG).
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(c) Turn the power switch off.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE SKID CONTROL ECU
OK -- Continue to next step.
6. READ VALUE USING TECHSTREAM (BRAKE PEDAL STROKE SENSOR)
(a) Connect the pedal effort gauge.
(b) Connect Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Select the Data List mode on Techstream.

ABS / VSC / TRAC:





(e) When depressing the brake pedal with the amount of force listed in the table below, check that the output value displayed on Techstream is normal.
HINT: The brake pedal must be depressed gradually.

Standard voltage:






NG -- REPLACE BRAKE PEDAL STROKE SENSOR
OK -- Continue to next step.
7. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(c) Perform a road test.
(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- REPLACE SKID CONTROL ECU
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)