Subaru 2002 IMPREZA Service Manual page 1472

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
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:
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:
7 CHECK POOR CONTACT.
Check poor contact in ECM and fuel pump
controller connector.
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1M
Ω?
Is there poor contact in ECM
and fuel pump controller con-
nector.
EN(TURBO)-312
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(TURBO)-52,
Fuel Pump Con-
troller.>
No