Subaru Forester 2004 Service Manual page 231

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTIC)
Step
27 CHECK ELECTRONIC THROTTLE CON-
TROL GROUND CIRCUIT.
Measure the resistance between ECM connec-
tor and engine ground.
Connector & terminal
(B137) No. 3 — Engine ground:
28 CHECK ELECTRONIC THROTTLE CON-
TROL.
Measure the resistance between electronic
throttle control terminals.
Terminals
No. 1 — No. 2:
29 CHECK ELECTRONIC THROTTLE CON-
TROL.
Move the throttle valve to the fully open and
fully closed positions with fingers
Check the valve returns to the specified posi-
tion when releasing fingers.
Check
Is the resistance less than 10
Ω?
Is the resistance less than 5
Ω?
Does the valve return to the
specified position?
Standard value: 3 mm (0.12 in)
from fully closed position
EN(H4DOTC 2.5)-230
Yes
Go to step 28. Repair the open
circuit of harness.
Go to step 29. Repair the elec-
tronic throttle con-
trol.
Repair the poor Repair the elec-
contact in ECM tronic throttle con-
connector. Replace trol.
the ECM if defec-
tive. <Ref. to
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
No