C1392

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1247/47: Stroke Sensor Malfunction

DTC C1247/47 - Stroke Sensor Malfunction

DTC C1392/48 - Stroke Sensor Zero Point Calibration Undone

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: When replacing the skid control ECU, 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 OF TECHSTREAM (BRAKE PEDAL STROKE SENSOR)
(a) Turn the power switch ON (READY).
(b) Check the Data List for the proper functioning of the pedal stroke sensor.

ABS / VSC / TRAC:





OK:
The normal condition value displayed on Techstream.
NG -- ADJUST BRAKE PEDAL STROKE SENSOR
OK -- Continue to next step.
3. PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION
NEXT -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTCs.
(b) Turn the power switch ON (READY).
(c) Check the same DTCs are recorded.

Result





HINT: This DTC may be memorized due to a malfunction in the connector terminal connection, etc.

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





(a) Disconnect the S9 ECU connector.
(b) Disconnect the B8 sensor connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
6. CHECK SKID CONTROL ECU (VCSK, SKG VOLTAGE)





(a) Measure the voltage of the connector.

HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage:





NG -- REPLACE SKID CONTROL ECU
OK -- Continue to next step.
7. CHECK SKID CONTROL ECU (SKS1, SKS2 VOLTAGE)





(a) Measure the voltage of the connectors.

- Measure the voltage from behind the connector with the connector connected to the skid control ECU.
- Slowly depress the brake pedal and check if the voltage between the skid control ECU terminals change in accordance with the pedal operation.

Standard voltage:





NG -- REPLACE BRAKE PEDAL STROKE SENSOR
OK -- REPLACE SKID CONTROL ECU