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
NOTICE:
When replacing the skid control ECU or brake pedal stroke sensor, perform initialization of linear solenoid valve and calibration Programming and Relearning.

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.
OK:
The brake pedal is securely installed and can be operated normally.
(b) Check the brake pedal height Adjustments.
OK:
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 the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Select the Data List mode on the Techstream.

ABS / VSC / TRAC:

(d) Read the pedal stroke sensor voltage value on the Techstream screen.
OK:
The normal condition value is displayed on the 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 Programming and Relearning.
NEXT -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTCs Electronically Controlled Brake System.
(b) Turn the engine switch on (IG).
(c) Check if the same DTCs are recorded Electronically Controlled Brake System.
Result:

B -- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO BRAKE PEDAL STROKE SENSOR)
A -- END
5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO BRAKE PEDAL STROKE SENSOR)

(a) Disconnect the skid control ECU connector and brake pedal stroke sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. INSPECT SKID CONTROL ECU (SENSOR INPUT VOLTAGE)

(a) Reconnect the skid control ECU connector.
(b) Disconnect the brake pedal stroke sensor connector.
(c) Measure the voltage according to the value(s) in the table below.
Voltage:

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

ABS / VSC / TRAC:

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

Voltage:

NG -- REPLACE BRAKE PEDAL STROKE SENSOR
OK -- Continue to next step.
8. RECONFIRM DTC
(a) Clear the DTC Electronically Controlled Brake System.
(b) Perform the road and braking test.
(c) Check if the same DTCs are recorded Electronically Controlled Brake System.
HINT:
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result:

B -- REPLACE SKID CONTROL ECU
A -- END