Subaru IMPREZA GD 2007 Series Manual page 354

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK SELECT CABLE.
2 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground with select lever at "N" and "P"
range.
Connector & terminal
(B136) No. 31 (+) — Chassis ground (–):
3 CHECK HARNESS BETWEEN ECM AND IN-
HIBITOR SWITCH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
inhibitor switch.
3) Measure the resistance of harness between
ECM and inhibitor switch connector.
Connector & terminal
(B136) No. 31 — (T7) No. 12:
4 CHECK INHIBITOR SWITCH GROUND LINE.
Measure the resistance of harness between
inhibitor switch connector and engine ground.
Connector & terminal
(T7) No. 7 — Engine ground:
Check
Are there any faults in the select
cable?
Is the voltage less than 1 V?
Is the resistance less than 1 Ω? Go to step 4.
Is the resistance less than 5 Ω? Replace the inhibi-
EN(H4SO)(diag)-245
ENGINE (DIAGNOSTICS)
Yes No
Repair or adjust Go to step 2.
the select cable.
<Ref. to CS-27,
Select Cable.>
Repair poor con- Go to step 3.
tact of the ECM
connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and inhibitor
switch connector
• Poor contact of
coupling connector
Repair the harness
tor switch. <Ref. to and connector.
4AT-47, Inhibitor
NOTE:
Switch.>
In this case, repair
the following item:
• Open circuit in
harness between
inhibitor switch
connector and
starter motor
ground line
• Poor contact of
coupling connector
• Poor contact in
starter motor con-
nector
• Poor contact in
starter motor
ground
• Starter motor