Subaru 2004 LEGACY Service Manual page 163

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK INPUT SIGNAL FROM ECM.
1) Turn the ignition switch to OFF.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B135) No. 19 (+) — Chassis ground (
2 CHECK HARNESS BETWEEN ECM AND
MAIN FUSE BOX CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B135) No. 19 — Chassis ground:
3 CHECK FUSE No. 13.
Check
Is the voltage more than 10 V? Repair the poor
−
):
Is the resistance less than 10
Ω?
Is the fuse blown out?
EN(H6DO)(diag)-232
Yes
Go to step 2.
contact in ECM
connector.
Repair the ground Go to step 3.
short circuit in har-
ness between
ECM connector
and battery termi-
nal.
Replace the fuse. Repair the har-
ness and connec-
tor.
NOTE:
In this case repair
the following:
• Open circuit in
harness between
ECM and battery
• Poor contact in
ECM connector
• Poor contact in
battery terminal
No