Winnebago 1987-1989 LeSharo Service Manual page 272

GENERAL INFORMATION
COMPONENT DESCRIPTIONS
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Firewall
Harness
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Cruise
KICk_Down~.
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Control
Switch Harness
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Throttle
Cable
Assembly
/
Vehicle
Kick-Down
Switch
(RC)
PILOT SOLENOID VALVES (EL)
These are ball type solenoid valves that are controlled by the
computer. They are mounted to the hydraulic valve body. Their
function is to seal off or allow by-pass of high pressure fluid,
which controls movement of the spool valves, resulting in gear
changes.
MULTI-PURPOSE SWITCH (CM)
This switch is mounted on the rear of the transmission. It is
operated by a cam (with a series of lobes) actuated by the shift
selector cable. The cam lobes open and close the pins on the
switch in various combinations to tell the computer which gear
position has been selected.
The multi-purpose switch controls:
the starter circuit (current is supplied only while in N or P)
- back-up light circuit (position R)
- solenoid valves (EL 1
&
EL 2)
LOAD POTENTIOMETER (P)
This is a variable resistor mounted to the rear of the throttle
body assembly. It monitors the position of the throttle plate
(butterfly) to feed engine load information to the computer. The
computer uses this input along with input from the speed sensor
to determine shift thresholds. (See Speed Sensor below).
There is also a kick-down switch incorporated into the cruise
control system. This switch is located at the throttle cable
assembly on the valve cover. If either of these switches are
malfunctioning or misadjusted, it will affect down-shift
operation.
KICK-DOWN SWITCH (RC)
This switch is integrated into the accelerator cable and is
non-adjustable and non-serviceable. The switch is closed at full
throttle position of the accelerator pedal travel, signalling the
computer to down-shift.
SPEED SENSOR (CV)
This is mounted to the side of the transmission directly over the
park wheel. The rotation of the teeth on the park wheel
interrupts the magnetic field generated by the sensor. This sends
a signal indicating transmission RPM to the computer. This input
is combined with that of the load potentiometer to determine
shift thresholds. (See Load Potentiometer above.)
COMPUTER MODULE/RENIX~ BOX (BE)
The computer module is mounted to the driver side firewall. It
receives input from:
- the kick-down switch
- the multi-purpose switch
- the load potentiometer
- the speed sensor
The computer then interprets these signals and sends a control
signal to the pilot solenoid valves to initiate gear changes.
F1-20