Subaru Impreza 2003 Service Manual page 862

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1)Disconnect the connectors from ECM and
TCM.
2)Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B135) No. 17 — Chassis ground:
2 CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B135) No. 16 — Chassis ground:
Check
Is the resistance less than 10
Ω?
Is the resistance less than 10
Ω?
EN(H4SOw/oOBD)-86
Yes
Repair the ground Go to step 2.
short circuit in har-
ness between
ECM and TCM
connector.
Repair the ground Replace the TCM.
short circuit in har- <Ref. to 4AT-70,
ness between Transmission Con-
ECM and TCM trol Module
connector. (TCM).>
No