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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 C0504 Left Front Wheel Speed Sensor Intermittent/Erratic >> General Description >> Diagnostic Method

Diagnostic Method

Case 1 

At a vehicle speed of 6.22 MPH or more, noise occurs once per rotor rotation.

Case 2 

At a vehicle speed of 12.44 MPH or more, noise occurs in the sensor signals of LF wheel.

Case 3 

An open in the sensor signal of LF wheel occurs.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Case 1 
Periodic Noise for LF Wheel Speed Sensor
Existed
Case 2 
ABS (Current Wheel Speed - Last Wheel Speed) of LF Wheel
6.73 MPH or more
Case 3 
ABS (Current Wheel Speed - Last Wheel Speed) of LF Wheel
2.1 MPH or more

Time needed for diagnosis: 

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