Subaru IMPREZA GD 2007 Series Manual page 1518

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
RELAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
secondary air combination valve relay.
3) Measure the resistance of harness between
ECM and secondary air combination valve relay.
Connector & terminal
(B136) No. 30 — (F27) No. 14:
2 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
RELAY.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 30 — Chassis ground:
Check
Is the resistance less than 1 Ω? Go to step 2.
Is the resistance 1 MΩ or more? Even if the malfunc-
EN(STI)(diag)-187
ENGINE (DIAGNOSTICS)
Yes No
Repair the open
circuit of harness
between ECM and
secondary air com-
bination valve
relay.
Repair the ground
tion indicator light short circuit of har-
illuminates, the cir- ness between
cuit has returned to ECM and second-
a normal condition ary air combination
at this time. Repro- valve relay.
duce the fault con-
dition, and
reperform the
check.
NOTE:
In this case, there
may be a tempo-
rary connector
contact failure.