C1247

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


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, perform the following operations:
* Initialization of linear solenoid valve and calibration Initialization
* Yaw rate and acceleration sensor zero point calibration Calibration
- When replacing the brake pedal stroke sensor, perform initialization of the linear solenoid valve and calibration Initialization.

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 power switch ON (IG).

(c) Select the Data List mode on the Techstream.

ABS/VSC/TRAC:





(d) Read the brake 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 Initialization.

NEXT -- Continue to next step.

4. RECONFIRM DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the power switch ON (IG).

(c) Check if the same DTCs are recorded Reading and Clearing Diagnostic Trouble Codes.

Result





B -- END
A -- Continue to next step.

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

(a) Disconnect the A20 ECU connector.

(b) Disconnect the A34 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 VOLTAGE)

(a) Reconnect the A20 ECU connector.





(b) Disconnect the A34 sensor connector.

(c) Turn the power switch ON (IG).

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

Standard voltage:





NG -- REPLACE SKID CONTROL ECU Removal
OK -- Continue to next step.

7. READ VALUE USING TECHSTREAM (BRAKE PEDAL STROKE SENSOR ASSEMBLY)

(a) Connect the brake pedal effort gauge.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (IG).

(d) Select the Data List mode on the 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 the Techstream is normal.

HINT
The brake pedal must be depressed gradually.

Standard voltage:





NG -- REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY Removal
OK -- Continue to next step.

8. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Perform the road and braking test.

(c) Check if the same DTCs are recorded Reading and Clearing Diagnostic Trouble Codes.

HINT
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result





B -- REPLACE SKID CONTROL ECU Removal

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting