Subaru IMPREZA GD 2007 Series Manual page 1621

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
34 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL MOTOR.
1) Connect the ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 2 (+) — Engine ground (–):
(E57) No. 1 (+) — Engine ground (–):
35 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL MOTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 2 — Engine ground:
(E57) No. 1 — Engine ground:
36 CHECK ELECTRONIC THROTTLE CON-
TROL MOTOR HARNESS.
Measure the resistance between the electronic
throttle control connector terminals.
Connector & terminal
(E57) No. 2 — (E57) No. 1:
37 CHECK ELECTRONIC THROTTLE CON-
TROL GROUND CIRCUIT.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 5 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 3 — Chassis ground:
(B137) No. 7 — Chassis ground:
38 CHECK ELECTRONIC THROTTLE CONTROL.
Measure the resistance between electronic
throttle control terminals.
Terminals
No. 2 — No. 1:
39 CHECK ELECTRONIC THROTTLE CONTROL.
Move the throttle valve to the fully open and fully
closed positions with fingers.
Check that the valve returns to the specified
position when releasing fingers.
Check
Is the voltage 5 V or more?
Is the resistance 1 MΩ or more? Go to step 36.
Is the resistance 1 MΩ or more? Go to step 37.
Is the resistance less than 5 Ω? Go to step 38.
Is the resistance 50 Ω or less? Go to step 39.
Does the valve return to the
specified position? Standard
value: 3 mm (0.12 in) from fully
closed position
EN(STI)(diag)-290
Yes No
Repair the short Go to step 35.
circuit to power in
the harness
between the ECM
and electronic
throttle control.
Repair the ground
short circuit of har-
ness between the
ECM and elec-
tronic throttle con-
trol.
Repair the short
circuit in the har-
ness between the
ECM and elec-
tronic throttle con-
trol.
Repair the open
circuit of the har-
ness between the
ECM and engine
ground.
Replace the elec-
tronic throttle con-
trol. <Ref. to
FU(H4DOTC)-16,
Throttle Body.>
Repair poor con- Replace the elec-
tact of the ECM tronic throttle con-
connector. trol. <Ref. to
FU(H4DOTC)-16,
Throttle Body.>