Subaru IMPREZA GD 2007 Series Manual page 398

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
13 CHECK SENSOR OUTPUT.
Read the data of sub throttle sensor signal
using Subaru Select Monitor.
NOTE:
Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-32, Subaru Select Monitor.>
14 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL MO-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
electronic throttle control.
3) Measure the resistance between ECM and
electronic throttle control connector.
Connector & terminal
(B137) No. 5 — (E57) No. 2:
(B137) No. 4 — (E57) No. 1:
15 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL MO-
TOR.
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 (–):
16 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL MO-
TOR.
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:
17 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:
18 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:
Check
Is the voltage 1.64 — 1.70 V?
Is the resistance less than 1 Ω? Go to step 15.
Is the voltage 5 V or more?
Is the resistance 1 MΩ or
more?
Is the resistance 1 MΩ or
more?
Is the resistance less than 5 Ω? Go to step 19.
EN(H4SO)(diag)-289
ENGINE (DIAGNOSTICS)
Yes No
Go to step 14. Repair poor con-
tact of the elec-
tronic throttle
control connector.
Replace the elec-
tronic throttle con-
trol if defective.
<Ref. to
FU(H4SO)-12,
Throttle Body.>
Repair the open
circuit of harness
between ECM and
electronic throttle
control.
Go to step 16.
Repair the short
circuit to power in
the harness
between the ECM
and electronic
throttle control.
Go to step 17. Repair short cir-
cuit of the harness
to ground between
the ECM and elec-
tronic throttle con-
trol.
Go to step 18. Repair the short
circuit of harness
between ECM and
electronic throttle
control.
Repair the open
circuit of the har-
ness between the
ECM and engine
ground.