Subaru IMPREZA GD 2007 Series Manual page 352

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Place the shift lever in a position except for
neutral.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
transmission harness connector (T2).
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 — Chassis ground:
Check
Is the voltage 10 V or more?
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-243
ENGINE (DIAGNOSTICS)
Yes No
Repair poor con- Go to step 2.
tact of the ECM
connector.
Repair the short Repair short cir-
circuit of transmis- cuit of the harness
sion harness, or to ground between
replace the neutral ECM and transmis-
position switch. sion harness con-
nector.