Subaru IMPREZA GD 2007 Series Manual page 377

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2 CHECK HARNESS BETWEEN ECM AND
STARTER INTERLOCK RELAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and starter interlock relay.
3) Measure the resistance of harness between
ECM and starter interlock relay connector.
Connector & terminal
(B136) No. 32 — (B225) No. 28:
NOTE:
For AT model, measure the voltage with select
lever in "P" or "N".
3 CHECK HARNESS BETWEEN ECM AND IG-
NITION SWITCH.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 32 — Chassis ground:
NOTE:
For AT model, measure the voltage with select
lever in "P" or "N".
Check
Is the resistance less than 1 Ω? Go to step 3.
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-268
Yes No
Check DTC using Go to step 2.
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4SO)(diag)-
72, List of Diagnos-
tic Trouble Code
(DTC).>
NOTE:
Check the follow-
ing item and repair
or replace if neces-
sary.
• Open circuit of
harness between
ECM and starter
interlock relay con-
nector
• Poor contact of
the inhibitor switch
connector (AT
model)
• Poor contact of
the inhibitor switch
(AT model)
Repair short cir- Repair poor con-
cuit of the harness tact of the ECM
to ground between connector.
the ECM and igni-
tion switch connec-
tor.