Subaru Impreza 2003 Service Manual page 1389

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK THROTTLE CABLE.
2 CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) 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
(B137) No. 10 (+) — Chassis ground ( − − − − ):
4 CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(B137) No. 10 (+) — Chassis ground ( − − − − ):
Check
Does the throttle cable have
play for adjustment?
Is the voltage more than 10 V? Go to step 3.
Is the voltage more than 10 V? Repair the battery
Shake the ECM harness and
connector, while monitoring
value of voltage meter. Does
the voltage change?
EN(H4DOTC)-213
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Adjust the throttle
cable. <Ref. to
SP(H4SO)-9,
INSTALLATION,
Accelerator Con-
trol Cable.>
Go to step 4.
Replace the idle
short circuit in har- air control solenoid
ness between valve. <Ref. to
ECM and idle air FU(H4DOTC)-36,
control solenoid Idle Air Control
valve connector. Solenoid Valve.>
After repair, and ECM <Ref. to
replace the ECM. FU(H4DOTC)-49,
<Ref. to Engine Control
FU(H4DOTC)-49, Module (ECM).>
Engine Control
Module (ECM).>
Repair the battery Contact your Sub-
short circuit in har- aru distributor ser-
ness between vice.
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(H4DOTC)-49,
parts.
Engine Control
Module (ECM).>
No
be-
probable
multiple