Subaru Legacy 2005 Service Manual page 1949

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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 using Subaru Select
Monitor.
NOTE:
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H6DO)(diag)-26, Subaru Select Moni-
tor.>
2 CHECK POOR CONTACT.
Check poor contact in 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 connector 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
(B136) No. 34 — (B315) No. 4:
4 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 engine
ground.
Connector & terminal
(B315) No. 4 — Engine ground:
5 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 engine
ground.
Connector & terminal
(B315) No. 5 (+) — Engine ground (
6 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B136) No. 17 — (B136) No. 15:
(B136) No. 17 — (B136) No. 16:
Check
Is the voltage less than 4.8 V? Go to step 2.
Is there poor contact?
Is the resistance less than 1
Ω?
Is the resistance less than 5
Ω?
Is the voltage less than 6 V?
−
):
Is the resistance more than 1
MΩ?
EN(H6DO)(diag)-253
ENGINE (DIAGNOSTICS)
Yes
Go to step 3.
Repair the poor Temporary poor
contact. contact occurred,
but it is normal at
present.
Go to step 4. Repair the open
circuit of harness
connector.
Go to step 5. Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H6DO)-34,
Engine Control
Module (ECM).>
Go to step 6. Repair the battery
short circuit of har-
ness between
ECM connector
and accelerator
pedal position sen-
sor connector.
Repair the poor Repair the short
contact in acceler- circuit to sensor
ator pedal position power supply.
sensor connector.
Replace the accel-
erator pedal posi-
tion sensor if
defective.
No