Subaru Legacy 2004 Service Manual page 815

Step
1 CHECK OPTION CODE.
2 CHECK MAIN RELAY.
1) Turn the ignition switch to OFF.
2) Remove the main relay.
3) Connect the battery to main relay terminals
No. 1 and No. 2.
4) Measure the resistance between main relay
terminals.
Terminals
No. 3 — No. 5:
No. 4 — No. 6:
3 CHECK GROUND CIRCUIT FOR ECM.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B134) No. 6 — Chassis ground:
(B134) No. 7 — Chassis ground:
(B135) No. 1 — Chassis ground:
(B135) No. 4 — Chassis ground:
(B135) No. 12 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 3 — Chassis ground:
(B137) No. 7 — Chassis ground:
4 CHECK INPUT VOLTAGE OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 19 (+) — Chassis ground (
5 CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
Model with immobilizer
(B137) No. 14 (+) — Chassis ground (
Model without immobilizer
(B137) No. 15 (+) — Chassis ground (
6 CHECK INPUT VOLTAGE OF MAIN RELAY.
Measure the voltage between main relay con-
nector and chassis ground.
Connector & terminal
LHD model
(B47) No. 1 (+) — Chassis ground (
RHD model
(B47) No. 2 (+) — Chassis ground (
Diagnostics for Engine Starting Failure
Is the option code EC, EK or
K4?
Is the resistance less than 10
'?
Is the resistance less than 5
'?
Is the voltage more than 10 V? Go to step 5.
"
):
Is the voltage more than 10 V? Go to step 6.
"
):
"
):
Is the voltage more than 10 V? Go to step 7.
"
):
"
):
EN(H4SO 2.5)(diag)-59
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
ENGINE (DIAGNOSTICS)
No
Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-66, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
Replace the main
relay.
Repair the open
circuit in harness
between ECM
connector and
engine grounding
terminal.
Repair the open or
ground short cir-
cuit of power sup-
ply circuit.
Repair the open or
ground short cir-
cuit of power sup-
ply circuit.
Repair the open
circuit in harness
between ECM
connector and
main relay connec-
tor.