Subaru Legacy 2004 Service Manual page 654

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
9 CHECK ACCELERATOR POSITION SEN-
SOR.
Measure the resistance of accelerator position
sensor without depressing the accelerator
pedal.
Terminals
No. 2 — No. 6:
10 CHECK ACCELERATOR POSITION SEN-
SOR.
Measure the resistance of accelerator position
sensor with the accelerator pedal depressed.
Terminals
No. 5 — No. 4:
11 CHECK ACCELERATOR POSITION SEN-
SOR.
Measure the resistance of accelerator position
sensor with the accelerator pedal depressed.
Terminals
No. 2 — No. 6:
12 CHECK ACCELERATOR POSITION SEN-
SOR OUTPUT.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Turn the ignition switch to ON.
4) Read the data of main throttle sensor signal
and sub accelerator position sensor signal
using Subaru Select Monitor.
13 CHECK POOR CONTACT.
Check poor contact in connector between
ECM and accelerator position sensor.
14 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connector from accelerator
position sensor.
4) Measure the resistance between ECM con-
nector and accelerator position sensor connec-
tor.
Connector & terminal
(B137) No. 31 — (B315) No. 4:
(B136) No. 18 — (B315) No. 6:
15 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR POSITION SENSOR.
1) Connect the ECM connector.
2) Measure the resistance between accelera-
tor position sensor connector and engine
ground.
Connector & terminal
(B315) No. 4 — Engine ground:
(B315) No. 6 — Engine ground:
16 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR POSITION SENSOR.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between accelerator
position sensor connector and engine ground.
Connector & terminal
(B315) No. 5 (+) — Engine ground (
(B315) No. 2 (+) — Engine ground (
Check
Is the resistance 0.15 — 0.63
k&?
Is the resistance 0.5 — 2.5
k&?
Is the resistance 0.28 — 1.68
k&?
Is the voltage less than 4.8 V? Go to step 13.
Is there poor contact?
Is the resistance less than 1
&?
Is the resistance less than 5
&?
Is the voltage less than 6 V?
"
):
"
):
EN(H4SO 2.0)(diag)-222
Yes
Go to step 10. Replace the accel-
erator position
sensor.
Go to step 11. Replace the accel-
erator position
sensor.
Go to step 12. Replace the accel-
erator position
sensor.
Go to step 14.
Repair the poor Go to step 18.
contact.
Go to step 15. Repair the open
circuit of harness
connector.
Go to step 16. Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO 2.0)-
34, Engine Con-
trol Module
(ECM).>
Go to step 17. Repair the battery
short circuit in har-
ness between
ECM connector
and accelerator
position sensor
connector.
No