Subaru LEGACY 2006 Manual page 331

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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. 8 — No. 7:
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
(B362) No. 7 (+) — 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 con-
nector and engine ground.
Connector & terminal
(B136) No. 21 — Engine ground:
DH:DTC P2109 THROTTLE/PEDAL POSITION SENSOR "A" MINIMUM STOP
PERFORMANCE
NOTE:
For the diagnostic procedure, refer to DTC P2101. <Ref. to EN(H4SO)(diag)-285, DTC P2101 THROTTLE
ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>
Check
Is the resistance more than 1
MΩ?
Is the voltage more than 5 V?
Is the resistance more than 1
MΩ?
EN(H4SO)(diag)-294
Yes No
Go to step 2.
Replace the elec-
tronic throttle con-
trol relay.
Go to step 3. Repair the power
supply short cir-
cuit of harness
between ECM and
electronic throttle
control relay.
Repair the poor Repair the ground
contact of ECM short circuit of har-
connector.
ness between
Replace the ECM ECM and elec-
if defective. <Ref. tronic throttle con-
to FU(H4SO)-36, trol relay.
Engine Control
Module (ECM).>