Fuel Injector And Resistor - Subaru XT 1988 Service Manual

FUEL INJECTION SYSTEM
2-7
(2) Check source voltage.
Disconnect the connector of the auxiliary air valve, and
check voltage on the harness side.
Voltage (when engine is running):
Over 12V
If the voltage is OV or lower than 12V, check the harness
and connector for condition.
Cause of trouble
(\\~
L2-1111
Fig_ 42
3) If item 2) above is normal but only item 1) is faulty,
the cause may be as follows:
Symptom Remedy
1 Sticking of shutter valve of auxiliary
•
Engine stalls easily when engine is
air valve. cold.
(Sticking in closed direction)
Replace auxiliary air
2
Sticking of shutter valve of auxiliary
•
Engine rpm does not lower smoothly
valve.
air valve.
during warm-up operation.
(Sticking in open direction)
•
Engine rpm remains high.
3 Clogged air passage.
Same as
CD
Fuel Injector and Resistor
1800cc model
INSPECTION
Using a stethoscope or a long-type screwdriver, make sure of
operating noise (clicking sound) of each injector (when idling
or cranking engine). If this operating noise cannot be heard on
any injector:
1) Disconnect the control unit connector.
Measure voltage across the body and terminals 49 (W), 50 (W),
51 (WL) and 52 (WL) of control unit connector (body side),
respectively.
Specified voltage:
12V
If voltage is below lOV in any line, the affected harness from
the battery to the control unit through the resistor and
injector is broken or shorted.
25
Check air passage, such as
hose, etc. and clean.
2) Disconnect each fuel injector connector.
Measure resistance between the terminals of each injector.
Specified resistance:
2-3n
If resistance is greater than 1 Mn, the affected circuit is
broken. If 0
fl,
the circuit is shorted. Replace the injector.
Fig. 43