Subaru Legacy 2004 Service Manual page 1019

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
16 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:
17 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 (
18 CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR 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:
(B136) No. 28 — (B136) No. 15:
(B136) No. 28 — (B136) No. 16:
19 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 the acceler-
ator position sensor.
4) Measure the resistance between connector
terminals of accelerator position sensor.
Connector & terminal
(B315) No. 5 — (B315) No. 2:
Check
Is the resistance less than 5
!?
Is the voltage less than 6 V?
"
):
"
):
Is the resistance more than 1
M!?
Is the resistance more than 1
M!?
EN(H4SO 2.5)(diag)-260
Yes
Go to step 17. Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO 2.5)-
36, Engine Con-
trol Module
(ECM).>
Go to step 18. Repair the battery
short circuit in har-
ness between
ECM connector
and accelerator
position sensor
connector.
Go to step 19. Repair the short
circuit to sensor
power supply.
Repair the poor Repair the short
contact in ECM circuit in harness
connector. between ECM
Replace the ECM connector and
if defective. <Ref. accelerator posi-
to FU(H4SO 2.5)- tion sensor con-
36, Engine Con- nector.
trol Module
(ECM).>
No