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| Illustration 1 | g01412320 |
Engine start circuit | |
The components of the engine start circuit are the key start switch, the fire suppression control loop receptacle (foam type), the battery electrical isolator loop plug, the Power Train Electronic Control Module (Power Train ECM), the Engine Electronic Control Module (Engine ECM), the start relay magnetic switch, the main power relay magnetic switch, the electric starting motor solenoid, the electric starting motor, the STIC steering transmission control and wheel steering transmission control.
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| Illustration 2 | g01262346 |
(1) Key start switch (2) OFF position (3) ON position (4) START position | |
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| Illustration 3 | g01286393 |
(5) Fire suppression control loop receptacle (foam type) | |
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| Illustration 4 | g01434333 |
Left side view of engine (6) Battery electrical isolator loop plug | |
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| Illustration 5 | g01262334 |
Operator station (under seat) (7) Power Train ECM | |
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| Illustration 6 | g01262336 |
Left side view of engine (8) Engine ECM | |
With the battery disconnect switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker 1 to Engine ECM (8) and key start switch (1) . With key start switch (1) in ON position (3) , 24 volt power is supplied from the batteries via circuit breaker 1 to main power relay magnetic switch (9) , via circuit breaker 6 to Engine ECM (8) and via circuit breaker 14 to Power Train ECM (7) .
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| Illustration 7 | g01263021 |
Main power relay magnetic switch (under cover) | |
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| Illustration 8 | g01428004 |
(9) Main power relay magnetic switch | |
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| Illustration 9 | g01286043 |
Rear view of engine (10) Start relay magnetic switch | |
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| Illustration 10 | g01262344 |
Left side view of engine (11) Electric starting motor solenoid (12) Electric starting motor | |
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| Illustration 11 | g01262345 |
(13) Transmission control (STIC steering) (14) Transmission direction control switch | |
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| Illustration 12 | g01288559 |
(15) Transmission control (wheel steering) | |
When the key start switch is in START position (4) , Power Train ECM (7) supplies 24 volt power to start relay magnetic switch (10) . Power then returns to Power Train ECM (7) to ground. Power Train ECM (7) will energize start relay magnetic switch (10) when transmission direction control switch (14) or wheel steer transmission control (15) is in the NEUTRAL position. When start relay magnetic switch (10) is energized, 24 volt power is supplied to electric starting motor solenoid (11) and to electric starting motor (12) . Electric starting motor (12) will begin to crank.
ReferenceFor information on the engine start switch in the OFF position, refer to Systems Operation, Testing and Adjusting, "Engine Stop".