Subaru LEGACY 2006 Manual page 347

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ACCELERATOR PEDAL POSITION
SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Read the data of main accelerator pedal
position sensor signal and sub accelerator
pedal position sensor signal using Subaru
Select Monitor.
NOTE:
Subaru Select Monitor
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-26, Subaru Select Moni-
tor.>
2 CHECK POOR CONTACT.
Check poor contact of connector between
ECM and accelerator pedal position sensor.
3 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Disconnect the connectors from accelerator
pedal position sensor.
4) Measure the resistance between ECM con-
nector and accelerator pedal position sensor
connector.
Connector & terminal
(B135) No. 23 — (B315) No. 5:
(B135) No. 21 — (B315) No. 3:
(B135) No. 31 — (B315) No. 2:
(B135) No. 22 — (B315) No. 1:
4 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B135) No. 23 — Chassis ground:
(B135) No. 21 — Chassis ground:
(B135) No. 31 — Chassis ground:
(B135) No. 22 — Chassis ground:
5 CHECK POWER SUPPLY OF ACCELERA-
TOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between accelerator
pedal position sensor connector and engine
ground.
Connector & terminal
(B315) No. 2 (+) — Engine ground (–):
(B315) No. 1 (+) — Engine ground (–):
6 CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor.
Terminals
No. 2 — No. 3:
Check
Is the voltage more than 0.4 V? Go to step 2.
Is there poor contact?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage 4.5 — 5.5 V?
Is the resistance between 1.2
and 4.8 kΩ?
EN(H4SO)(diag)-310
Yes No
Go to step 3.
Repair the poor Go to step 12.
contact.
Go to step 4. Repair the open
circuit of harness
connector.
Go to step 5. Repair the ground
short circuit of har-
ness.
Go to step 6. Repair the poor
contact of ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 7. Replace the accel-
erator pedal posi-
tion sensor.