Subaru 2009 IMPREZA Service Manual page 659

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Place the shift lever in a position other than
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
neutral position switch.
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 M or
more?
EN(H4SO)(diag)-242
Yes No
Repair the poor Go to step 2.
contact of ECM
connector.
Repair the short Repair the short
circuit of transmis- circuit to ground
sion harness, or harness between
replace the neutral ECM and neutral
position switch. position switch
<Ref. to 5MT-33, connector.
Switches and Har-
ness.>