Section 2 Engine DC Control System
24 Diagnostic Repair Manual
Circuit Condition - Stop
With the start-run-stop switch (SW1) placed in the STOP
position, wire 167 is connected to wire 0 (frame ground).
The ground signal is supplied via wire 167 to the printed
circuit board. The printed circuit board will internally open
wire 229 from ground. This action will de-energize the
start stop relay (SSR). With the SSR de-energized, wire
14 will no longer have 12 VDC supplied to it through the
relay. This de-energizes the fuel shutoff solenoid (FSS)
stopping fuel to the engine. With the SSR de-energized,
wire 18 will now be connected to wire 0. This action will
ground the magnetos out through wire 18 causing loss of
spark to the engine. With the loss of fuel and loss of
spark the engine will shutdown.
Fault Shutdown
With the generator running, if the low oil pressure (LOP)
closes, wire 86 will be connected to wire 0 frame ground.
Printed circuit board action will open wire 229 from
ground; this action will de-energize the start stop relay
(SSR). This action will cause a shutdown.
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