Suzuki Samurai 1986, Service Manual

Page: 188 / 482

[Replacing
FUEL CUT SYSTEM
If a malcondition such as those listed below still
occurs even after confirming proper function
and condition of the sensors of the feed back
system and their circuits through the above
checks, a trouble may exist within the ECM. In
such a cause, replace the ECM.
l
Fuel consumption increases even in normal
Checking fuel cut system
1) Make sure that fuel cut solenoid valve makes a
clicking sound when ignition switch is turned
to “ON” or “OFF” without cranking engine.
driving.
l
Engine tends to stall.
l
Engine is hard to start.
SWITCH VENT SOLENOID
Checking switch vent solenoid
1) Disconnect canister hose from switch vent
solenoid and connect a new hose to the pipe
of solenoid.
2) Blow air into new hose with ignition switch at
both “OFF” and “ON” (but without starting
engine) and check to be sure that air passes
through solenoid in both cases.
1. Carburetor
2. Fuel cut solenoid valve
Fig. 5-3-48 Fuel cut solenoid valve
2) Warm up engine to normal operating tempe-
rature.
3) Increase engine revolution to 3,000 3,500
rpm. Under these conditions, check to be sure
that engine rpm changes when idle micro
switch lever on carburetor is moved as shown
in below figure.
1. Switch vent solenoid
2. Canister hose (new)
3. Blow air
Fig. 5-3-47 Checking switch vent solenoid
Do not suck the hose. The fuel vapor
3) Start engine and run it at idle speed. Then
check to be sure that air does not pass through
solenoid when blowing air into new hose.
4) Remove new hose and connect original hose
to switch vent solenoid.
1. Carburetor
2. Idle micro switch lever
Fig. 5-3-49 Idle micro switch lever
If found defective in above checks 1) and
check fuel cut solenoid circuit referring to item
“checking feed back system circuits” in p. 5-29.
5-36