Subaru IMPREZA GD 2007 Series Manual page 3718

asieps_tobira_IM_US.book 27 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK TRANSMISSION TYPE.
2 CHECK INHIBITOR SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the inhibitor switch harness con-
nector.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
(T7) No. 12 (+) — Chassis ground (–):
3 CHECK INHIBITOR SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the starter motor harness con-
nector.
3) Measure the resistance between inhibitor
switch harness connector terminal and chassis
ground.
Connector & terminal
(T7) No. 7 — Chassis ground:
4 CHECK INHIBITOR SWITCH.
Remove and check the inhibitor switch. <Ref. to
CC-8, Inhibitor Switch.>
5 CHECK NEUTRAL POSITION SWITCH CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the neutral position switch har-
ness connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
Non-turbo model:
(B25) No. 1 (+) — Chassis ground (–):
Turbo model:
(B128) No. 1 (+) — Chassis ground (–):
STI model:
(B128) No. 2 (+) — Chassis ground (–):
6 CHECK NEUTRAL POSITION SWITCH CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure resistance between harness con-
nector terminal of neutral position switch and
chassis ground.
Connector & terminal
Non-turbo model:
(B25) No. 2 — Chassis ground:
Turbo model:
(B128) No. 3 — Chassis ground:
STI model:
(B128) No. 5 — Chassis ground:
7 CHECK NEUTRAL POSITION SWITCH.
Remove and check the neutral position switch.
<Ref. to CC-9, Neutral Position Switch.>
CRUISE CONTROL SYSTEM (DIAGNOSTICS)
Check
Is the transmission type AT?
Is the voltage approx. 5 V?
Is the resistance less than 10 Ω? Repair the har-
Is the inhibitor switch OK?
Is the voltage 10 V or more?
Is the resistance less than 10 Ω? Go to step 7.
Is the neutral position switch
OK?
CC(ETC)(diag)-27
Yes No
Go to step 2. Go to step 5.
Go to step 3. Check for open or
short in the har-
ness between
inhibitor switch and
ECM.
Go to step 4.
ness.
Replace the ECM. Replace the inhibi-
<Ref. to tor switch.
FU(H4SO)-39,
Engine Control
Module (ECM).>
<Ref. to
FU(H4DOTC)-50,
Engine Control
Module (ECM).>
Go to step 6. Check for open or
short in the har-
ness between neu-
tral position switch
and ECM.
Repair the har-
ness.
The neutral posi- Replace the neu-
tion switch circuit is tral position switch.
operating properly.