Subaru Legacy 2002 Service Manual page 1821

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Automatic Transmission (Diagnostics)
D: DTC 33 FRONT VEHICLE SPEED SENSOR
S004521I13
DIAGNOSIS:
¼ The vehicle speed signal is abnormal.
¼ The circuit in combination meter is faulty.
¼ The harness connector between TCM and vehicle speed sensor is in short or open.
TROUBLE SYMPTOM:
¼ Erroneous idling.
¼ Engine stalls.
¼ Poor driving performance.
AT-52