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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Continuously Variable Transmission (Diagnostics)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P0721: Output Shaft Speed Sensor Circuit Range/Performance >> Diagnostic Method

Diagnostic Method

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If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
ABS (1): Vehicle speed (calculated from front output shaft speed sensor) - Vehicle speed (calculated from wheel speed sensor) > 10 MPH
(1) ABS: Absolute value

Time needed for diagnosis:  5 seconds

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