Subaru 2009 IMPREZA Service Manual page 1516

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
LH 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. 12 (+) — Chassis ground (–):
(B137) No. 13 (+) — Chassis ground (–):
Check
Is the voltage 5 V or more?
EN(H4DOTC)(diag)-295
ENGINE (DIAGNOSTICS)
Yes No
Repair the short Replace the tum-
circuit to power in ble generator valve
harness between assembly LH.
ECM and tumble <Ref. to
generator valve FU(H4DOTC)-44,
assembly LH con- Tumble Generator
nector. Valve Assembly.>