Subaru IMPREZA GD 2007 Series Manual page 350

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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) Place the select lever other than "N" and "P"
range.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 (+) — Chassis ground (–):
3 CHECK HARNESS BETWEEN ECM AND
TRANSMISSION HARNESS CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
transmission harness connector (T3).
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 — Chassis ground:
4 CHECK TRANSMISSION HARNESS CON-
NECTOR.
1) Disconnect the connector from inhibitor
switch.
2) Measure the resistance between the trans-
mission harness connector and engine ground.
Connector & terminal
(T3) No. 12 — Engine ground:
Check
Are there any faults in the select
cable?
Is the voltage 10 V or more?
Is the resistance 1 MΩ or
more?
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-241
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.
Go to step 4.
Repair short cir-
cuit of the harness
to ground between
ECM and transmis-
sion harness con-
nector.
Replace the inhibi- Repair short cir-
tor switch. <Ref. to cuit of the harness
4AT-47, Inhibitor to ground between
Switch.> transmission har-
ness connector
and inhibitor switch
connector.