Suzuki Samurai 1986, Service Manual

Page: 164 / 482

Gear position.
It is sensed by the fifth switch located on the
transmission. The switch turns “ON” when
the gear shift lever is shifted to fifth gear
position and “OFF” when shifted to positions
other than fifth gear position.
1. Fifth
2. Transmission
Fig. 5-l-13 Fifth switch
l
Altitude compensation.
When the vehicle is at high altitude and the
feed back system does not function, the air/
fuel mixture becomes richer because of low
air density. To compensate the richer air/
fuel mixture at high altitude, the high altitude
compensator is “ON” by sensing the baro-
metric pressure and sends a signal to the ECM.
Following the signal, the ECM controls the
mixture control solenoid in the carburetor,
thus compensating the air/fuel mixture.
1. High altitude compensator
2. Thermal engine room switch
Fig. 14 High altitude compensator and
thermal engine room switch
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Engine room temperature compensation.
Sensing the air temperature in the engine
room the thermal engine room switch sends
an electric signal to ECM to compensate the
air/fuel ratio of the mixture. When the air
temperature in the engine room is low, the
switch operates to make the mixture rich.
When the air temperature in the engine room
is high, the switch stops operating, which
means, the air/fuel ratio of the mixture is not
controlled by the switch. Refer to Fig. 5-1-l 4
for the thermal engine room switch.
[Three-way catalyst]
The three-way catalyst is provided in the exhaust
system (exhaust center pipe). The function of
the catalyst is to reduce the emission of CO, HC
and in the exhaust gas by oxidizing or
converting them into 0 and respec-
tively.
BOWL VENTILATION SYSTEM
This system has a switch vent solenoid which is
operated by the ignition switch and the ECM. It
prevents the fuel vapor in the float chamber
from flowing out into the atmosphere both
when the engine is at a stop and at work. When
the ignition switch is at “OFF” position or when
cranking the engine (engine not started), the
vent passage is closed by the solenoid valve, and
therefore, the vapor flows from the float cham-
ber into the vapor storage canister. When the
engine is operating, the solenoid receives an
electrical signal from the ECM and its valve
keeps the inner vent passage open. As a result,
the vapor passes through the passage into the
carburetor and is drawn into the engine.
1. Switch vent solenoid
2. inner vent passage
3. Solenoid valve
4. To canister
5. Float
Fig. Bowl ventilation system