Subaru LEGACY 2004 Service Manual page 857

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
• KA and KS model
NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.
Step
1 CHECK OPTION CODE.
2 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. 7 — No. 8:
3 CHECK POWER SUPPLY SHORT CIRCUIT
OF ELECTRONIC THROTTLE CONTROL
RELAY.
1) Turn the ignition switch to ON.
2) Measure the voltage between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B362) No. 8 (+) — Chassis ground (
4 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nector and chassis ground.
Connector & terminal
(B135) No. 35 — Chassis ground:
CI: DTC P2109 THROTTLE ANGLE CLOSED POSITION ERROR
NOTE:
For diagnostic procedure, refer to DTC P2101. <Ref. to EN(H4SO 2.5)(diag)-231, DTC P2101 THROTTLE
ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>
Check
Is the option code EC, EK or
K4?
Is the resistance more than 1
MΩ?
Is the voltage more than 5 V?
−
):
Is the resistance more than 1
MΩ?
EN(H4SO 2.5)(diag)-241
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-66, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
Go to step 3. Replace the elec-
tronic throttle con-
trol relay.
Go to step 4. Repair power sup-
ply short circuit in
harness between
ECM and elec-
tronic throttle con-
trol relay.
Repair the poor Repair the ground
contact in ECM short circuit in har-
connector. ness between
Replace the ECM ECM and elec-
if defective. <Ref. tronic throttle con-
to FU(H4SO 2.5)- trol relay.
36, Engine Con-
trol Module
(ECM).>
No