Subaru Legacy 2005 Service Manual page 1957

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
8 CHECK SENSOR OUTPUT.
1) Connect all the connectors.
2) Turn the ignition switch to ON.
3) Read the data of main throttle 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.>
9 CHECK SENSOR OUTPUT.
Read the data of sub throttle 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.>
10 CHECK POOR CONTACT.
Check poor contact in connector between
ECM and electronic throttle control.
11 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from electronic
throttle control.
4) Measure the resistance between ECM con-
nector and electronic throttle control connector.
Connector & terminal
(B136) No. 35 — (E57) No. 3:
(B136) No. 18 — (E57) No. 6:
(B136) No. 29 — (E57) No. 4:
12 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Connect the ECM connector.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 3 — Engine ground:
13 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 5 (+) — Engine ground (
14 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
Measure the voltage between electronic throt-
tle control connector and engine ground.
Connector & terminal
(E57) No. 6 (+) — Engine ground (
(E57) No. 4 (+) — Engine ground (
Check
Is the voltage less than 4.63
V?
Is the voltage less than 4.73
V?
Is there poor contact?
Is the resistance less than 1
Ω?
Is the resistance less than 5
Ω?
Is the voltage less than 10 V?
−
):
Is the voltage less than 10 V?
−
):
−
):
EN(H6DO)(diag)-261
ENGINE (DIAGNOSTICS)
Yes
Go to step 9. Go to step 11.
Go to step 10. Go to step 11.
Repair the poor Temporary poor
contact. contact occurred,
but it is normal at
present.
Go to step 12. Repair the open
circuit of harness
connector.
Go to step 13. Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H6DO)-34,
Engine Control
Module (ECM).>
Go to step 14. Repair the battery
short circuit of har-
ness between
ECM connector
and electronic
throttle control
connector.
Go to step 15. Repair the short
circuit of harness
between ECM
connector and
electronic throttle
control connector.
No