Subaru 2002 IMPREZA Service Manual page 709

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
2 CHECK ACCESSORY.
Check
Are the car phone and/or CB
installed on vehicle?
EN-277
ENGINE (DIAGNOSTICS)
Yes
Repair the ground- Replace the TCM.
ing line of car <Ref. to AT-46,
phone or CB sys- Transmission Con-
tem. trol Module
(TCM).>
No