Subaru 2009 IMPREZA Service Manual page 707

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. 29 — No. 30:
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
(B220) No. 30 (+) — 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 ECM.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 21 — Chassis ground:
DD:DTC P2109 THROTTLE/PEDAL POSITION SENSOR "A" MINIMUM STOP
PERFORMANCE
NOTE:
For the diagnostic procedure, refer to DTC P2101. <Ref. to EN(H4SO)(diag)-282, DTC P2101 THROTTLE
ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>
Check
Is the resistance 1 M or
more?
Is the voltage 10 V or more?
Is the resistance 1 M or
more?
EN(H4SO)(diag)-290
Yes No
Go to step 2. Replace the elec-
tronic throttle con-
trol relay. <Ref. to
FU(H4SO)-50,
Electronic Throttle
Control Relay.>
Repair the short Go to step 3.
circuit to power in
the harness
between ECM and
electronic throttle
control relay con-
nector.
Repair the poor Repair the short
contact of ECM circuit in harness
connector. to ground between
ECM and elec-
tronic throttle con-
trol relay
connector.