Subaru IMPREZA 2002 Service Manual page 639

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
2 CHECK ACCESSORY.
Check Yes
Are car phone and/or CB
installed on vehicle?
Repair grounding
line of car phone
or CB system.
No
Replace the TCM.
<Ref. to AT-45,
Transmission Con-
trol Module
(TCM). >
EN(S0HC)-315