Subaru IMPREZA GD 2007 Series Manual page 1631

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 5 (+) — Chassis ground (–):
(B137) No. 4 (+) — Chassis ground (–):
Check
Is the voltage 5 V or more?
EN(STI)(diag)-300
Yes No
Repair the short Replace the tum-
circuit to power in ble generator valve
the harness assembly. <Ref. to
between ECM and FU(H4DOTC)-43,
tumble generator Tumble Generator
valve assembly. Valve Actuator.>