- When a switch is open, no signal is provided to the corresponding input of the ECM. This “no signal” condition is also called “floating”.
- When a switch is closed, a ground signal or +battery signal is provided to the corresponding input of the ECM.
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| Illustration 1 | g00586095 |
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Transmission Oil Level Switch | |
The transmission oil level switch is an input to the ECM. The transmission oil level switch is closed to ground during normal operation. The switch opens when the oil level is less than the minimum level. The open switch informs the ECM about the low oil level. Then, the ECM informs the operator about the low oil level. The switch is open and the float is in the down position when the switch is not installed on the machine.
The transmission oil level switch has two contacts. The switch connects to the ECM through contacts J1-12 and J1-56.
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| Illustration 2 | g00586096 |
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Filter Bypass Switch | |
The torque converter inlet filter bypass switch is an input to the ECM. The bypass switch is located on the filter housing. The transmission ECM sends the signal to the VIMS and the VIMS informs the operator if the filter is restricted. The filter bypass switch connects to the ECM through contacts J1-12 and contact J1-46.
The torque converter screen bypass switch is an input to the ECM. The bypass switch is located on the access cover for the torque converter outlet screen. The transmission ECM sends the signal to the VIMS and the VIMS informs the operator if the filter is restricted. The filter bypass switch connects to the ECM through contacts J1-12 and contact J1-55.
The transmission charge filter bypass switch is an input to the ECM. The bypass switch is located on the housing of the transmission control filter. The bypass valve will open in order to protect the system if the filter is restricted. The bypass switch provides an input signal to the VIMS and the VIMS informs the operator if the filter is restricted. The filter bypass switch connects to the ECM through contacts J1-12 and J1-54.