Subaru Forester 2004 Service Manual page 150

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK SPEEDOMETER AND TACHOME-
TER OPERATION IN COMBINATION
METER.
2 CHECK INPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON. (engine OFF)
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B136) No. 20 (+) — Chassis ground (
3 CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the combination meter connec-
tor (i11) and ECM connector.
3) Turn the ignition switch to ON.
4) Measure the voltage of harness between
ECM and chassis ground.
Connector & terminal
(B136) No. 20 (+) — Chassis ground (
4 CHECK HARNESS BETWEEN ECM AND
FUEL TANK CORD.
1) Turn the ignition switch to OFF.
2) Separate fuel tank cord connector (R57)
and rear wiring harness connector (R15).
3) Measure the resistance between ECM and
fuel tank cord.
Connector & terminal
(B136) No. 20 — (R15) No. 7:
5 CHECK HARNESS BETWEEN FUEL TANK
CORD AND CHASSIS GROUND.
Measure the resistance between fuel tank cord
and chassis ground.
Connector & terminal
(R15) No. 3 — Chassis ground:
6 CHECK FUEL TANK CORD.
1) Disconnect the connector from fuel level
sensor.
2) Measure the resistance between fuel level
sensor and coupler connector.
Connector & terminal
(R57) No. 3 — (R58) No. 5:
Check
Does the speedometer and
tachometer operate normally?
Is the voltage more than 4.75
V?
−
):
Is the voltage more than 4.75
V?
−
):
Is the resistance less than 5
Ω?
Is the resistance less than 5
Ω?
Is the resistance less than 10
Ω?
EN(H4DOTC 2.5)-149
ENGINE (DIAGNOSTIC)
Yes
Go to step 2. Repair or replace
the combination
meter. <Ref. to IDI-
3, Combination
Meter System.>
Go to step 3. Even if the malfunc-
tion indicator light
illuminates, the cir-
cuit has returned to
a normal condition
at this time. A tem-
porary poor contact
of the connector
may be the cause.
NOTE:
In this case repair
the following:
• Poor contact in
fuel pump connec-
tor
• Poor contact in
coupling connector
Go to step 4. Repair battery
short circuit
between ECM and
combination meter
connector.
Go to step 5. Repair open circuit
between ECM and
fuel tank cord.
Go to step 6. Repair open circuit
between fuel tank
cord and chassis
ground.
NOTE:
In this case repair
the following:
Poor contact in
coupling connector
Go to step 7. Repair open circuit
between coupling
connector and fuel
level sensor.
No