Subaru Forester 2004 Service Manual page 252

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.
4) Check the voltage change by shaking the har-
ness and connector of ECM, engine harness con-
nector and electronic throttle control connector.
9 CHECK SENSOR OUTPUT.
1) Read the data of sub throttle sensor signal
using Subaru Select Monitor.
2) Check the voltage change by shaking the har-
ness and connector of ECM, engine harness con-
nector and electronic throttle control connector.
10 CHECK POOR CONTACT.
Check the 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 the elec-
tronic throttle control.
4) Measure the resistance between ECM con-
nector and electronic throttle control connector.
Connector & terminal
(B136) No. 18 — (E57) No. 6:
(B136) No. 29 — (E57) No. 4:
(B136) No. 35 — (E57) No. 3:
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 (
4) Check the voltage change by shaking the
harness and connector of ECM and engine
harness connector while monitoring the value
with voltage meter.
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 more than 10 V? Go to step 14.
−
):
EN(H4DOTC 2.5)-251
ENGINE (DIAGNOSTIC)
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 con-
nector. Replace the
ECM if defective.
Repair battery short
circuit in harness
between ECM con-
nector and elec-
tronic throttle control
connector.
No