Subaru Impreza 2003 Service Manual page 1369

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
6 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER.
Measure the resistance between ECM and
combination meter connector.
Connector & terminal
(B135) No. 25 — (i12) No. 2:
7 CHECK FUEL TANK CORD.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from fuel sub level
sensor.
3)Measure the resistance between fuel sub
level sensor and chassis ground.
Connector & terminal
(R59) No. 1 — Chassis ground:
8 CHECK FUEL TANK CORD.
1)Disconnect the connector from fuel pump
assembly.
2)Measure the resistance between fuel pump
assembly and chassis ground.
Connector & terminal
(R59) No. 2 — Chassis ground:
9 CHECK FUEL LEVEL SENSOR.
1)Remove the fuel pump assembly. <Ref. to
FU(H4DOTC)-61, Fuel Pump.>
2)Measure the resistance between fuel level
sensor and terminals with its float set to the full
position.
Terminals
No. 3 — No. 5:
10 CHECK FUEL SUB LEVEL SENSOR.
1)Remove the fuel sub level sensor. <Ref. to
FU(H4DOTC)-64, Fuel Sub Level Sensor.>
2)Measure the resistance between fuel sub
level sensor and terminals with its float set to
the full position.
Terminals
No. 1 — No. 2:
Check
Is the resistance less than 10
Ω?
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
Is the resistance 0.5 — 2.5 Ω? Go to step 10.
Is the resistance 0.5 — 2.5 Ω? Repair the poor
EN(H4DOTC)-193
ENGINE (DIAGNOSTICS)
Yes
Repair or replace Repair the open
the combination circuit between
meter. <Ref. to ECM and combi-
IDI-3, Combina- nation meter con-
tion Meter Sys- nector.
tem.>
NOTE:
In this case, repair
the following:
Poor contact in
coupling connector
Go to step 8. Repair the ground
short circuit in fuel
tank cord.
Go to step 9. Repair the ground
short circuit in fuel
tank cord.
Replace the fuel
level sensor.
Replace the fuel
contact in harness sub level sensor.
between ECM and
combination meter
connector.
No