Subaru IMPREZA GD 2007 Series Manual page 1521

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
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 voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 30 (+) — Chassis ground (–):
Check
Is the voltage 10 V or more?
EN(STI)(diag)-190
Yes No
Repair the short Repair poor con-
circuit to power in tact of the ECM
the harness connector.
between ECM and
secondary air com-
bination valve
relay.