Subaru 2002 IMPREZA Service Manual page 1399

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
2 CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 10 (+) — Chassis ground ( − − − − ):
3 CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from idle air con-
trol solenoid valve.
3)Turn the ignition switch to ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 10 (+) — Chassis ground ( − − − − ):
4 CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 10 (+) — Chassis ground ( − − − − ):
Check
Is the voltage more than 10 V? Go to step 3.
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(TURBO)-239
ENGINE (DIAGNOSTICS)
Yes
Go to step 4.
Replace the idle
short circuit in har- air control solenoid
ness between valve. <Ref. to
ECM and idle air FU(TURBO)-36,
control solenoid Idle Air Control
valve connector. Solenoid Valve.>
After repair, and ECM <Ref. to
replace the ECM. FU(TURBO)-49,
<Ref. to Engine Control
FU(TURBO)-49, Module.>
Engine Control
Module.>
Repair the battery Contact with your
short circuit in har- Subaru distributor
ness between service.
ECM and idle air
NOTE:
control solenoid
Inspection by DTM
valve connector.
is required,
After repair,
cause
replace the ECM.
cause is deteriora-
<Ref. to
tion of
FU(TURBO)-49,
parts.
Engine Control
Module.>
No
be-
probable
multiple