Subaru LEGACY 2006 Manual page 324

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
7 CHECK SENSOR OUTPUT.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Read the data of sub throttle sensor signal
using Subaru Select Monitor.
NOTE:
Subaru Select Monitor
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-26, Subaru Select Moni-
tor.>
8 CHECK POOR CONTACT.
Check poor contact in connector between
ECM and electronic throttle control.
9 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors 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
(B134) No. 18 — (E57) No. 6:
(B134) No. 28 — (E57) No. 4:
(B134) No. 19 — (E57) No. 5:
10 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B134) No. 18 — Chassis ground:
(B134) No. 19 — Chassis ground:
(B134) No. 28 — Chassis ground:
11 CHECK SENSOR POWER SUPPLY.
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 (–):
12 CHECK SHORT CIRCUIT IN ECM.
1) Turn the ignition switch to OFF.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 6 — Engine ground:
(E57) No. 4 — Engine ground:
Check
Is the voltage more than 0.8 V? Go to step 8.
Is there poor contact?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage 4.5 — 5.5 V?
Is the resistance more than 10
Ω?
EN(H4SO)(diag)-287
ENGINE (DIAGNOSTICS)
Yes No
Go to step 9.
Repair the poor Go to step 13.
contact.
Go to step 10. Repair the open
circuit of harness
connector.
Go to step 11. Repair the ground
short circuit of har-
ness.
Go to step 12. Repair the poor
contact of ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 13.
Repair the poor
contact of ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO)-36,
Engine Control
Module (ECM).>