Subaru IMPREZA GD 2007 Series Manual page 1586

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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 CONNECTOR.
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? Repair the short
EN(STI)(diag)-255
ENGINE (DIAGNOSTICS)
Yes No
Repair poor con- Go to step 2.
tact of the ECM
connector.
Repair the ground
circuit of transmis- short circuit of har-
sion harness, or ness between
replace the neutral ECM and transmis-
position switch. sion harness con-
nector.