Subaru Legacy 2002 Service Manual page 899

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Engine (Diagnostics)
H: DTC 31 THROTTLE POSITION SENSOR
¼ DIAGNOSIS:
¼ The throttle position sensor signal is abnormal.
¼ The throttle position sensor is installed abnormally.
¼ The harness connector between ECM and throttle position sensor is in short or open.
¼ TROUBLE SYMPTOM:
¼ Erroneous idling
¼ Engine stalls
¼ Poor driving performance
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.
<Ref. to EN(w/oOBD)-30, OPERATION, Clear Memory Mode.> and <Ref. to EN(w/oOBD)-28,
OPERATION, Inspection Mode.>
¼ WIRING DIAGRAM:
S038521G62
EN(w/oOBD)-88
B2M4199