Subaru IMPREZA GD 2007 Series Manual page 1588

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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 neutral.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN ECM AND
NEUTRAL SWITCH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect connectors from the ECM and
transmission harness.
3) Measure the resistance of harness between
ECM and transmission harness connector.
Connector & terminal
(B136) No. 31 — (T12) No. 2:
(B136) No. 6 — (T12) No. 1:
3 CHECK NEUTRAL SWITCH.
1) Place the shift lever in neutral.
2) Measure the resistance between transmis-
sion harness connector terminals.
Connector & terminal
(T2) No. 1 — No. 2:
Check
Is the voltage less than 1 V?
Is the resistance less than 1 Ω? Go to step 3.
Is the resistance less than 1 Ω? Repair the poor
EN(STI)(diag)-257
ENGINE (DIAGNOSTICS)
Yes No
Check for poor Go to step 2.
contact of the ECM
connector.
Repair the open
circuit of harness
between ECM and
transmission har-
ness connector.
Repair the open
contact of trans- circuit of transmis-
mission harness sion harness, or
connector. replace the neutral
switch.