Subaru 2002 IMPREZA Service Manual page 537

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 24 (+) — Chassis ground ( − − − − ):
2 CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from air assist
injector solenoid valve.
3)Turn the ignition switch to ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 24 (+) — Chassis ground ( − − − − ):
3 CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(B134) No. 24 (+) — Chassis ground ( − − − − ):
Check
Is the voltage more than 10 V? Go to step 2.
Is the voltage more than 10 V? Repair the battery
Does the voltage change more
than 10 V by shaking harness
and connector of ECM while
monitoring the value with volt-
age meter?
EN-105
ENGINE (DIAGNOSTICS)
Yes
Go to step 3.
Replace the air
short circuit in har- assist injector
ness between solenoid valve
ECM and air assist <Ref. to FU-40, Air
injector solenoid Assist Injector
valve connector. Solenoid Valve.>
After repair, and ECM <Ref. to
replace the ECM. FU-51, Engine
<Ref. to FU-51, Control Module.>
Engine Control
Module.>
Repair the battery Contact with your
short circuit in har- Subaru distributor
ness between service.
ECM and air assist
NOTE:
injector solenoid
Inspection by DTM
valve connector.
is required,
After repair,
cause
replace the ECM.
cause is deteriora-
<Ref. to FU-51,
tion of
Engine Control
parts.
Module.>
No
be-
probable
multiple