Subaru IMPREZA GD 2007 Series Manual page 356

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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
(E136) No. 31 — (B25) No. 2:
3 CHECK HARNESS BETWEEN ECM AND
NEUTRAL SWITCH CONNECTOR.
Measure the resistance of harness between
ECM and transmission harness connector.
Connector & terminal
(E136) No. 6 — (B25) No. 1:
4 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 5 Ω? Go to step 4.
Is the resistance less than 1 Ω? Repair the poor
EN(H4SO)(diag)-247
ENGINE (DIAGNOSTICS)
Yes No
Repair poor con- Go to step 2.
tact of the ECM
connector.
Repair the open
circuit of harness
between ECM and
transmission har-
ness connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and trans-
mission harness
connector
• Poor contact of
coupling connector
Repair the open
contact of trans- circuit of transmis-
mission harness sion harness, or
connector. replace the neutral
switch.