Engine System - LPG 167Service Manual – CS7000
Engine Overheat Shutdown
• If the engine overheats, the temperature switch closes. This completes a path to ground for the high
coolant temp shut down relay and energizes the relay. This removes power from the fuel lock off solenoid.
This does not shut the engine down immediately, but allows the engine to use up the fuel trapped in the
regulator before stalling due to lack of fuel.
• The main machine controller monitors the engine coolant temperature by sending out a 5v feed through
an internal resistor to the temperature switch. When the switch closes the voltage on the switch side
drops from 5v to 0v . In response, the main machine controller sets an overheat code and alerts the
operator. After a 5 second delay, it removes the 12v Ignition request signal. If the engine has not already
shut down, the system will then shut down as if the operator had shut off the key (Normal engine shut
off).
2
1
3
5
4
IGN. REQUEST
MAIN
CONTROLLER
FUEL
LOCK-OFF
SOLENOID
OIL SWITCH
(OPEN FOR
PRESSURE)
TEMP. SWITCH
(OPEN FOR
NORMAL TEMP.)
RUN ENABLE SIGNAL
SHU TDOWN Cont rol
CRANK REQUEST
IGNITION REQUEST
ENGINE RUN (12V INPUT)
HIGH COOLANT TEMP Signal
SPEED 2 (12V OUTPUT)
SPEED 3 (12V OUTPUT)
Eng. RPM
Sensor
STARTER
12v BATTERY
ALTERNATOR
IGNITION POWER
FOR IGNITER &
HIGH COOLANT TEMP.
SH UT DOW N RE LAY
1
5 4
3
2
CONTROL
RELAY
1
5
4
3
2
IGNITION
REQUEST RELAY
POWER
RELAY
1
5
4
3
2
LOW OIL PRESS.
SHUTDOWN
RELAY
1
5
4
3
2
CRANK
REQUEST
RELAY
1
2
5
6
7
8
9
10
11
12
WOODWARD
L-SERIES
ACTUATOR
3
4
1 2 3
Main Machine
Controller
Carb.
Fuel
Shut Off
Solenoid
85
86
87
87a
30
12v
5v
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