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| Illustration 1 | g01046543 |
Engine start circuit | |
The components of the engine start circuit are the key start switch, the Power Train Electronic Control Module (Power Train ECM), the Engine Electronic Control Module (Engine ECM), the start relay magnetic switch, the main relay magnetic switch, the electric starting motor solenoid, the electric starting motor, the transmission control (STIC steering), the fire suppression control loop receptacle (foam type), and the fire suppression control loop plug (dry powder type).
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| Illustration 2 | g01046558 |
Dash panel (1) Key start switch (2) OFF position (3) ON position (4) START position | |
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| Illustration 3 | g01046562 |
Cab (5) Power Train ECM | |
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| Illustration 4 | g01046565 |
Left side view of engine (6) Engine ECM | |
With the battery disconnect switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker #11 to the Engine ECM. With key start switch (1) in ON position (3), 24 volt power is supplied from the batteries via circuit breaker #5 to the Engine ECM and via circuit breaker #9 to the Power Train ECM.
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| Illustration 5 | g01046574 |
Left side view of engine (7) Start relay magnetic switch | |
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| Illustration 6 | g01048287 |
Side view of cab (8) Main relay magnetic switch | |
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| Illustration 7 | g01048288 |
Left side view of engine (9) Electric starting motor solenoid (10) Electric starting motor | |
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| Illustration 8 | g01048289 |
Cab (11) Transmission control (STIC steering) (12) Transmission direction control switch | |
When the key start switch is in the START position (4), Power Train ECM (5) supplies 24 volt power to start relay magnetic switch (7). Power then returns to the Power Train ECM to ground. The Power Train ECM will energize the main relay magnetic switch when transmission direction control switch (12) is in the NEUTRAL position. When the start relay magnetic switch is energized, 24 volt power is supplied to electric starting motor solenoid (9) and to electric starting motor (10). The electric starting motor will begin to crank.
Reference: For information on the engine start switch in the OFF position, refer to Systems Operation, Testing and Adjusting, "Engine Stop" for the machine that is being serviced.