Subaru Legacy 2002 Service Manual page 1448

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
2 CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON. (Engine OFF)
2) Measure voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 25 (+) — Chassis ground
(−):
3 CHECK INPUT VOLTAGE OF ECM.
1) Turn ignition switch to OFF.
2) Disconnect combination meter connector
(i10) and ECM connector.
3) Turn ignition switch to ON.
4) Measure voltage of harness between ECM
and chassis ground.
Connector & terminal
(B135) No. 25 (+) — Chassis ground
(−):
4 CHECK HARNESS BETWEEN ECM AND
FUEL TANK CORD.
1) Turn ignition switch to OFF.
2) Separate fuel tank cord connector (R57)
and rear wiring harness connector (R15).
3) Measure resistance between ECM and fuel
tank cord.
Connector & terminal
(B135) No. 25 — (R15) No. 6:
5 CHECK HARNESS BETWEEN FUEL TANK
CORD AND CHASSIS GROUND.
Measure resistance between fuel tank cord
and chassis ground.
Connector & terminal
(R15) No. 6 — Chassis ground:
6 CHECK FUEL TANK CORD.
1) Disconnect connector from fuel level sen-
sor.
2) Measure resistance between fuel level sen-
sor and coupling connector.
Connector & terminal
(R57) No. 6 — (R58) No. 3:
Step
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(H6)-241
Check Yes
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Engine (DIAGNOSTICS)
No
Even if MIL lights
up, the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector may be the
cause.
NOTE:
In this case,
repair the follow-
ing:
¼ Poor contact in
fuel pump con-
nector
¼ Poor contact in
coupling connec-
tor
Repair battery
short circuit
between ECM
and combination
meter connector.
Repair open cir-
cuit between ECM
and fuel tank
cord.
Repair open cir-
cuit between fuel
tank cord and
chassis ground.
NOTE:
In this case,
repair the follow-
ing:
Poor contact in
coupling connec-
tors
Repair open cir-
cuit between cou-
pling connector
and fuel level sen-
sor.