Subaru IMPREZA GD 2007 Series Manual page 271

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
electronic throttle control.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 19 — Chassis ground:
(B134) No. 28 — Chassis ground:
2 CHECK SHORT CIRCUIT INSIDE THE ECM.
1) Connect the ECM.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 4 — Engine ground:
Check
Is the resistance 1 MΩ or
more?
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-162
Yes No
Go to step 2. Repair short cir-
cuit of the harness
to ground between
ECM and elec-
tronic throttle con-
trol connector.
Replace the elec- Repair short cir-
tronic throttle con- cuit of the harness
trol. <Ref. to to ground between
FU(H4SO)-12, ECM and elec-
Throttle Body.> tronic throttle con-
trol connector.
Replace the ECM if
defective. <Ref. to
FU(H4SO)-39,
Engine Control
Module (ECM).>