SWITCH AS-ROCKER 7X6396 - Caterpillar

Switches
Switches provide the following types of information to the ECM: open signals, ground signals, and +Battery signals. Switches are open or closed.
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 a +Battery signal is provided to the corresponding input of the ECM.Start Switch (Key)
Illustration 1 g00497430
Start Switch (Key)
The key start switch is an input of the ECM. The switch connects to connector contact J2-1. The switch tells the ECM that the operator wants to start the engine. The ECM then initiates the neutral start function. Refer to the Systems Operation, "System Protection Functions" section of this manual for more information. The signal is open during normal operation. The switch closes to the +Battery when the switch is in the START position.The switch has a connector with four contacts. Contact 3 connects to the ECM. Contact 4 connects to battery voltage. Contact 2 connects to the engine shutdown control. Contact 1 connects to the main relay.Note: After the switch is initially turned to the START position, the switch will not return to the START position from the ON position. The switch must be turned to the OFF position. The switch can then be turned to the START position.The ECM does not record diagnostic codes that are related with the key start switch.Neutral Switch
The neutral switch allows the operator to quickly shift the transmission to NEUTRAL from any gear. The switch has a connector with two contacts. The switch connects to the Transmission ECM through contact J1-43 and contact J2-63. See the Systems Operation, "System Protection Functions" section of this manual for more information.Lockup Clutch Switch
The lockup clutch switch allows the operator to disable the lockup clutch in all gears. The lockup clutch switch has a connector with two contacts. The switch connects to the Transmission ECM through contact J2-23 and contact J2-61. The ground connection is switched between the two pins when the switch is toggled. The transmission will be limited to NEUTRAL and PARK when an invalid switch position is detected. Refer to the Systems Operation, "System Protection Functions" section of this manual for more information.Bypass Switch (Transmission Oil Filter)
Illustration 2 g03220876
341-6644 Pressure Switch
The bypass switch allows oil to bypass the filter when the filter is plugged. When the bypass switch opens, the oil bypasses the filter. The bypass switch connects to the Transmission ECM through contact J1-63 and contact J2-63.Sensors
Sensors provide information to ECM inputs about changing conditions. The ECM receives the following types of information:
Speed
Temperature
PositionThe sensor signal changes in proportion to reflect changing conditions. The ECM sends the information to the gauges. The operator can view the information on the gauges. The ECM recognizes two types of sensor signals.Frequency - A frequency sensor produces an AC signal. The AC signal frequency (Hz)