Subaru LEGACY 2006 Manual page 349

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
15 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Measure the resistance between accelera-
tor pedal position sensor connector and chas-
sis ground.
Connector & terminal
(B315) No. 4 — Chassis ground:
(B315) No. 6 — Chassis ground:
16 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR 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 chassis
ground.
Connector & terminal
(B315) No. 5 (+) — Chassis ground (–):
(B315) No. 2 (+) — Chassis ground (–):
17 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B135) No. 23 — (B135) No. 21:
(B135) No. 23 — (B135) No. 22:
(B135) No. 31 — (B135) No. 21:
(B135) No. 31 — (B135) No. 22:
18 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 connector
terminals of accelerator pedal position sensor.
Connector & terminal
(B315) No. 5 — (B315) No. 2:
Check
Is the resistance less than 5
Ω?
Is the voltage less than 6 V?
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
EN(H4SO)(diag)-312
Yes No
Go to step 16. Repair the poor
contact of ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 17. Repair the battery
short circuit of har-
ness between
ECM connector
and accelerator
pedal position sen-
sor connector.
Go to step 18. Repair the short
circuit to sensor
power supply.
Repair the poor Repair the short
contact of ECM circuit of harness
connector. between ECM
Replace the ECM connector and
if defective. accelerator pedal
position sensor
connector.