Subaru Legacy 2004 Service Manual page 3781

6. CHECK ENGINE CONTROL MODULE
Step
1 CHECK ECM SIGNAL.
1) Start the engine.
2) Measure the voltage between ECM con-
nector and engine ground.
Connector & terminal
2.0 L non-turbo model and 2.5 L KS, KA
model
(B135) No. 27 (+) — Chassis ground (
2.0 L turbo model, 3.0 L model and 2.5 L
EC, K4, EK model
(B134) No. 23 (+) — Chassis ground (
2 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
combination meter.
3) Measure the resistance between ECM har-
ness connector and combination meter har-
ness connector.
Connector & terminal
2.0 L non-turbo model and 2.5 L KS, KA
model
(B135) No. 27 — (i10) No. 20:
2.0 L turbo model, 3.0 L model and 2.5 L
EC, K4, EK model
(B134) No. 23 — (i10) No. 20:
7. CHECK FUEL LEVEL SENSOR.
Step
1 CHECK COMMUNICATION ERROR DIS-
PLAY.
1) Set the ignition switch to ON.
2) Check that the error code is displayed in
odo/trip meter.
2 CHECK FUEL LEVEL SENSOR.
1) Remove the fuel level sensor. <Ref. to
FU(H4SO 2.0)-49, REMOVAL, Fuel Level Sen-
sor.> <Ref. to FU(H4SO 2.5)-51, REMOVAL,
Fuel Level Sensor.> <Ref. to FU(H4DOTC)-51,
REMOVAL, Fuel Level Sensor.> <Ref. to
FU(H6DO)-50, REMOVAL, Fuel Level Sen-
sor.>
2) Measure the resistance between fuel level
sensor terminals when the float is in FULL or
EMPTY position.
Terminals
No. 1 — No. 4:
Combination Meter System
Is the voltage more than 0 #$
14 V?
!
):
!
):
Is the resistance less than 10
"?
Is the error code "Er xx" dis-
played in odo/trip meter?
Is the resistance 1.0 — 3.0 "
(FULL) or 31 — 33 "
(EMPTY)?
IDI-9
INSTRUMENTATION/DRIVER INFO
Check Yes
Go to step 2.
Replace the meter
case assembly.
Check Yes
Check the commu-
nication circuit.
<Ref. to IDI-11,
COMMUNICA-
TION ERROR
DISPLAY,
INSPECTION,
Combination
Meter System.>
Go to step 3.
No
Check the ECM.
<Ref. to EN(H4SO
2.0)(diag)-2, Basic
Diagnostic Proce-
dure.> <Ref. to
EN(H4SO
2.5)(diag)-2, Basic
Diagnostic Proce-
dure.> <Ref. to
EN(H4DOTC)(diag
)-2, Basic Diag-
nostic Proce-
dure.> <Ref. to
EN(H6DO)(diag)-
2, Basic Diagnos-
tic Procedure.>
Repair the wiring
harness.
No
Go to step 2.
Replace the fuel
level sensor.