Subaru 2009 IMPREZA Service Manual page 1512

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
RH 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. 22 (+) — Chassis ground (–):
(B137) No. 23 (+) — Chassis ground (–):
Check
Is the voltage 5 V or more?
EN(H4DOTC)(diag)-291
ENGINE (DIAGNOSTICS)
Yes No
Repair the short Replace the tum-
circuit to power in ble generator valve
harness between assembly RH.
ECM and tumble <Ref. to
generator valve FU(H4DOTC)-44,
assembly RH con- Tumble Generator
nector. Valve Assembly.>