Subaru IMPREZA GD 2007 Series Manual page 403

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ELECTRONIC THROTTLE CON-
TROL RELAY.
1) Turn the ignition switch to OFF.
2) Remove the electronic throttle control relay.
3) Measure the resistance between electronic
throttle control relay terminals.
Terminals
No. 2 — No. 4:
2 CHECK SHORT CIRCUIT OF ELECTRONIC
THROTTLE CONTROL RELAY POWER SUP-
PLY.
1) Turn the ignition switch to ON.
2) Measure the voltage between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B309) No. 4 (+) — Chassis ground (–):
3 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 21 — Chassis ground:
DJ:DTC P2109 THROTTLE/PEDAL POSITION SENSOR "A" MINIMUM STOP
PERFORMANCE
NOTE:
For the diagnostic procedure, refer to DTC P2101. <Ref. to EN(H4SO)(diag)-286, DTC P2101 THROTTLE
ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>
Check
Is the resistance 1 MΩ or
more?
Is the voltage 10 V or more?
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-294
Yes No
Go to step 2. Replace the elec-
tronic throttle con-
trol relay.
Go to step 3.
Repair the short
circuit to power in
the harness
between ECM and
electronic throttle
control relay.
Repair poor con- Repair short cir-
tact of the ECM cuit of the harness
connector. to ground between
ECM and elec-
tronic throttle con-
trol relay.