C1346

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1247/47: 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
NOTE: When replacing the skid control ECU or brake pedal stroke sensor, perform initialization of linear solenoid valve and calibration .

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 the brake pedal height .
OK:
The brake pedal is securely installed.
The pedal height is within the specified range.
NG -- ADJUST BRAKE PEDAL
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (BRAKE PEDAL STROKE SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the Data List mode on Techstream.

ABS / VSC / TRAC:





(d) Read the pedal stroke sensor voltage value on the Techstream screen.
OK:
The normal condition value is displayed on Techstream.
NG -- ADJUST BRAKE PEDAL STROKE SENSOR
OK -- Continue to next step.
3. PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION
(a) Perform initialization of the linear solenoid valve and calibration .
NEXT -- Continue to next step.
4. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTC .
(c) Perform the road and braking test.
(d) Check if the same DTC is recorded .
Result:






B -- END
A -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE PEDAL STROKE SENSOR)





(a) Turn the power switch off.
(b) Disconnect the skid control ECU connector and the brake pedal stroke sensor connector.
(c) 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.
6. INSPECT SKID CONTROL ECU (SENSOR INPUT)





(a) Reconnect the skid control ECU connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:





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






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

ABS / VSC / TRAC:





(f) 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.
8. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTC .
(c) Perform the road and braking test.
(d) Check if the same DTC is recorded .
Result:






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