Subaru 2009 IMPREZA Service Manual page 1288

Step
1 CHECK DELIVERY (TEST) MODE CONNEC-
TOR.
1) Check the delivery (test) mode connector is
disconnected.
2) Turn the ignition switch to ON.
2 CHECK HARNESS BETWEEN ECM AND
CHASSIS GROUND TERMINAL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B135) No. 27 — Chassis ground:
Malfunction Indicator Light
Does the malfunction indicator
light blink?
Is the resistance less than 5 ? Repair the short
EN(H4DOTC)(diag)-67
Check Yes
Go to step 2.
circuit to ground in
harness between
ECM and delivery
(test) mode con-
nector.
ENGINE (DIAGNOSTICS)
No
System is normal.
NOTE:
Malfunction indica-
tor light blinks
when delivery
(test) mode con-
nector is connect-
ed.
Replace the ECM.
<Ref. to
FU(H4DOTC)-52,
Engine Control
Module (ECM).>