Subaru Legacy 2002 Service Manual page 1538

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Start engine, and warm-up the engine.
2) Turn ignition switch to OFF.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 14 (+) — Chassis ground
(−):
2 CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and
TCM.
3) Measure resistance of harness between
ECM and chassis ground.
Connector & terminal
(B136) No. 14 — Chassis ground:
3 CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure resistance of harness between ECM
and TCM connector.
Connector & terminal
(B136) No. 14 — (B55) No. 10:
Step
Is the voltage more than 3
V?
Is the resistance less than
10 Ω?
Is the resistance less than
1 Ω?
EN(H6)-331
Check Yes
Repair poor con-
tact in ECM con-
nector.
Repair ground
short circuit in
harness between
ECM and TCM
connector.
Repair poor con-
tact in ECM or
TCM connector.
Engine (DIAGNOSTICS)
No
Go to step 2.
Go to step 3.
Repair open cir-
cuit in harness
between ECM
and TCM connec-
tor.