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Home >> Subaru >> 2021 >> Crosstrek Limited >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Electric Brake Booster System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC C1A7E Brake Pedal Position Sensor Invalid Data >> General Description >> Diagnostic Method

Diagnostic Method

Brake pedal stroke sensor assembly state is invalid.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Case 1 
Brake stroke sensor power supply #
Less than 4.74 V
or
More than 5.23 V
Case 2 
Brake stroke sensor input #/Brake stroke sensor power supply #
Less than 0.06
or
More than 0.94
Case 3 
ABS (Current brake stroke sensor input #/Brake stroke sensor power supply # - Last brake stroke sensor input #/Brake stroke sensor power supply #)
More than 0.0848
Case 4 
Zero Position Correlation
Not Completed
Brake stroke sensor input 1/Brake stroke sensor power supply 1 + More than 1.1
Brake stroke sensor input 2/Brake stroke sensor power supply 2 or
Less than 0.9
Case 5 
Zero Position Correlation
Completed
Brake stroke sensor input 2/Brake stroke sensor power supply 2 Exceeds Brake stroke sensor input 2/Brake stroke sensor power supply 2_Max (Table 1 Value)
or
Below Brake stroke sensor input 2/Brake stroke sensor power supply 2_Min (Table 1 Value)
BRAKE STROKE SENSOR SPECIFICATION

Brake stroke sensor input 1/Brake stroke sensor power supply 1 0 0.19 0.21 0.61 1
Brake stroke sensor input 2/Brake stroke sensor power supply 2_Min 0.9377 0.7871 0.754 0.0937 -0.5502
Brake stroke sensor input 2/Brake stroke sensor power supply 2_Max 1.079 0.8379 0.8125 0.5695 0.3333

Time needed for diagnosis:  200 ms

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.