Subaru Impreza 2003 Service Manual page 469

Step
1 CHECK TEST MODE CONNECTOR.
1)Disconnect the test mode connector.
2)Turn the ignition switch to ON.
2 CHECK HARNESS BETWEEN ECM CON-
NECTOR AND ENGINE GROUNDING TER-
MINAL.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B136) No. 3 — Chassis ground:
MALFUNCTION INDICATOR LIGHT
Dose the malfunction indicator
light blink?
Is the resistance less than 5
Ω?
EN(H4SO)-57
Check
Go to step 2.
Repair short circuit
in harness
between ECM and
test mode connec-
tor.
ENGINE (DIAGNOSTICS)
Yes No
System is in good
order.
NOTE:
Malfunction indica-
tor light blinks at a
cycle of 3 Hz when
test mode connec-
tor is connected.
Replace the ECM.
<Ref. to
FU(H4SO)-48,
Engine Control
Module (ECM).>