Subaru IMPREZA GD 2007 Series Manual page 1479

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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? Go to step 2.
Is the resistance 1 MΩ or more? Replace the elec-
EN(STI)(diag)-148
Yes No
Repair the ground
short circuit of har-
ness between
ECM and elec-
tronic throttle con-
trol connector.
Repair the ground
tronic throttle con- short circuit of har-
trol. <Ref. to ness between
FU(H4DOTC)-16, ECM and elec-
Throttle Body.> tronic throttle con-
trol connector.
Replace the ECM if
defective. <Ref. to
FU(H4DOTC)-50,
Engine Control
Module (ECM).>