Subaru Forester 2004 Service Manual page 124

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
2 CHECK POOR CONTACT.
Check the poor contact in connector between
ECM and electronic throttle control.
3 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. 29 — (E57) No. 4:
(B136) No. 35 — (E57) No. 3:
4 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:
5 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.
6 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 4 (+) — Engine ground (
2) Check the voltage change by shaking the
harness and connector of ECM and engine
harness connector while monitoring the value
with voltage meter.
7 CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between connector
terminals.
Connector & terminal
(B136) No. 29 — (B136) No. 16:
Check
Is there poor contact in con-
nector between ECM and elec-
tronic throttle control?
Is the resistance less than 1
Ω?
Is the resistance less than 5
Ω?
Is the voltage more than 10 V? Go to step 6.
−
):
Is the voltage less than 10 V?
−
):
Is the resistance more than 1
MΩ?
EN(H4DOTC 2.5)-123
ENGINE (DIAGNOSTIC)
Yes
Repair the poor Temporary poor
contact. contact occurred,
but it is normal at
present.
Go to step 4. Repair the open
circuit of harness
connector.
Go to step 5. Repair the poor
contact in ECM
connector. Replace
the ECM if defec-
tive. <Ref. to
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
Repair battery
short circuit in har-
ness between
ECM connector
and electronic
throttle control
connector.
Go to step 7. Repair battery
short circuit in har-
ness between
ECM connector
and electronic
throttle control
connector.
Repair the poor Sensor power sup-
contact. Replace ply circuit may be
the electronic shorted.
throttle control if
defective.
No