Subaru Legacy 2003 Service Manual page 2035

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
5 CHECK HARNESS BETWEEN FUEL PUMP
CONTROLLER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness
between fuel pump controller and ECM
connector.
Connector & terminal
(R122) No. 9 — (B134) No. 13:
(R122) No. 8 — (B136) No. 16:
Is the measured value less than the speci-
fied value?
6 CHECK HARNESS BETWEEN FUEL PUMP
CONTROLLER AND ECM CONNECTOR.
Measure the resistance of harness between
fuel pump controller and chassis ground.
Connector & terminal
(R122) No. 9 — Chassis ground:
(R122) No. 8 — Chassis ground:
Does the measured value exceed the specified
value?
7 CHECK POOR CONTACT.
Check poor contact in ECM and fuel pump
controller connector.
Is there poor contact in ECM and fuel pump
controller connector.
Step
EN(H4DOSTC)-196
Value
1 Ω
1 MΩ
There is poor contact.
Yes
Go to step 6. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit
between fuel
pump controller
and ECM.
• Poor contact in
fuel pump control-
ler and ECM con-
nector.
Go to step 7. Repair the ground
short circuit
between fuel
pump controller
and ECM.
Repair the poor Replace the fuel
contact in ECM pump controller.
and fuel pump <Ref. to
controller. FU(H4DOSTC)-
43, Fuel Pump
Controller.>
No