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| Illustration 1 | g03376707 |
The key switch is a three position switch with two inputs into the power train ECM. When the key switch is moved to the ON position, a system voltage input is provided to the power train ECM. The presence of this voltage input will cause the ECM to transition from the "sleep mode" to the operational mode. When this mode change occurs, the ECM will initialize and then become operational.
When the key switch is moved to the OFF, the system voltage is no longer present at the ECM contact. The absence of the system voltage signals the ECM to transition from the operational mode to the sleep mode. The ECM will perform some inter power down procedures and then enter the sleep mode.
The transition period from the sleep mode to the operational mode happens in a short time. When the key switch is moved to the start position, a system voltage input will be provided to the power train ECM start contact. When the ECM detects this voltage and the machine system start status is correct, the ECM will initiate the engine cranking sequence.
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| Illustration 2 | g03349994 |
The ingress lights timer relay is controlled by the Machine ECM. The relay keeps the lights energized for a variable length of time after the machine is shut off.
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| Illustration 3 | g03722024 |
The forward ROPS light switch is a single pole switch. The switch has a normally connected and a normally open contact. When the switch is not engaged the normally connected contact is not connected, and the normally open contact is pulled to a low voltage state. When the switch is engaged, the normally open contact is connected to the supply and the normally connected contact jis not connected. Based on the voltage state of the normally open contact, the ECM determines if the switch is engaged. The switch controls the forward ROPS lights.
The operator presence sensor is located in the seat cushion for the operator seat. The sensor is an analog voltage sensor that varies with pressure.
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| Illustration 4 | g03350009 |
The main power relay is controlled by the machine ECM. When the keyswitch is moved into the ON or START, the ECM energizes the main power relay. The relay provides power from the battery to all switched systems.
The cylinder starter relay allows power to travel to the starter motor. The ECM controls the operation of the relay.
The forward ROPS light relay allows power to travel to the lights mounted on the ROPS. The ECM controls the operation of the relay.
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| Illustration 5 | g03350093 |
The seatbelt switch is a single pole switch. The switch has a normally connected and a normally open contact. When the switch is not engaged the normally connected contact is connected to the return, and the normally open contact floats to a high voltage state. When the switch is engaged, the normally open contact is connected to the return and the normally connected contact floats to a high voltage state. Based on the voltage state of the two ECM contacts, the ECM determines if the switch is engaged. The switch alerts the power train ECM of the state of the seatbelt.
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| Illustration 6 | g03350145 |
The fuel level sensor is an active analog sensor. The sensor determines the amount of fuel in the fuel tank and reports that information to the Implement ECM with an analog voltage signal.