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| Illustration 1 | g00991197 |
Block Diagram of Input Components | |
Sensors
Sensors provide information to the ECM about changing conditions. The sensor signal changes proportionally to the changing conditions. The following type of sensor signals are recognized by the machine ECM.
Frequency - This type of sensor produces a signal that varies in frequency as the condition changes.
Pulse Width Modulated Sensor (PWM) - This type of sensor produces a digital signal with a duty cycle that varies as the condition changes. The frequency of this signal is constant.
Speed Sensors
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| Illustration 2 | g00899619 |
Engine Speed Sensor
The engine speed sensor (14) is used to measure the speed of the engine. The sensor is an input to the ECM. The sensor connects to contact J1-17 and contact J1-18.
Torque Converter Output Speed Sensor
The torque converter output speed sensor (11) is used in order to measure the speed at the output of the torque converter. The value that is measured is compared with the value of the engine speed signal from the engine speed sensor in order to calculate the ratio of the torque converter output speed. The sensor is an input to the ECM. The sensor connects to contact J1-15 and contact J1-16.
Transmission Intermediate Speed Sensor
The transmission intermediate speed sensor (13) is used in order to measure the intermediate shaft speed of the transmission. The sensor is an input to the ECM. The sensor connects to contact J1-6 and contact J1-7.
Transmission Output Speed Sensor
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| Illustration 3 | g00899623 |
The transmission output speed sensor (12) is used in order to measure the output speed of the transmission. The value that is measured is used in order to control both upshifts and downshifts. The sensor is an input to the ECM. The sensor connects to contact J1-2 and contact J1-3.
Temperature Sensor (Torque Converter)
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| Illustration 4 | g00991230 |
The torque converter oil temperature sensor (2) is an input to the ECM. The information from the torque converter oil temperature sensor is sent to the instrument cluster for display. The sensor connects to the ECM through contacts J1-22 and contact J1-45.
Temperature Sensor (Transmission and Hydraulic Oil)
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| Illustration 5 | g00991216 |
The hydraulic oil temperature sensor (1) is an input to the ECM. The sensor provides an input signal to the ECM and the signal is also sent to the instrument cluster. The sensor connects to the ECM through contacts J1-11, J1-21 and J1-36.
Sensor (Shift Rail 1), Sensor (Shift Rail 2), and Sensor (Shift Rail 3)
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| Illustration 6 | g02122854 |
The sensors for the shift rails detect the position of the shift rails. The sensors send a signal to the ECM regarding the position of the rails. The ECM will determine if the transmission has been neutralized by the position of the rails. The sensors connect to the ECM through the following contacts: J2-49, J2-50, J2-51, J1-44 and J1-45.
Switches
Switches provide an open signal, a ground signal, or a +battery signal to the inputs of the ECM. 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.
Switch (Parking Brake)
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| Illustration 7 | g00899639 |
The parking brake switch (9) tells the ECM that the operator has the parking brake lever in the PARK position. When the operator places the parking brake lever in the PARK position, the normally closed circuit is open and the normally open circuit is closed to ground. When the lever is NOT in the PARK position, the normally closed circuit is closed to ground and the normally open circuit is open. The switch connects to the ECM through contacts J2-52 and contact J2-53.
Transmission Neutralizer Override Switch
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| Illustration 8 | g02122862 |
The transmission neutralizer override switch (7) will deactivate the direction clutch solenoid in order to temporarily place the transmission in neutral. When the top of the switch is pushed in, the transmission is automatically neutralized when the service brake pressure sensor detects a rise in the brake system pressure. The transmission is engaged when the brake system pressure decreases. This allows a higher engine speed for improved hydraulic performance when you operate the machine implements. This also prevents premature brake wear. The switch is located on the dash panel. The switch connects to the ECM through contacts J1-33.
Switch (Service Brake Pressure)
The service brake pressure switch (10) is used to monitor the pressure in the service brake system. The service brake pressure switch sends a signal to the ECM and the ECM neutralizes the transmission when the pressure reaches a set point. The ECM will engage the transmission when the pressure decreases below a set point. The set points for both the disengagement and the re-engagement are parameters that can be changed by using ET. The switch is located on the brake cylinder. The switch connects to the ECM through contacts J2-42.
Switch (Transmission Neutralizer)
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| Illustration 9 | g00940274 |
The transmission neutralizer switch (8) will deactivate the direction clutch solenoid in order to temporarily place the transmission in neutral. The transmission will remain in the neutral position while the switch is held. When the switch is released, the transmission is placed back into gear. The switch is used to neutralize the transmission, so the user can change gears. The switch is located on the transmission shift lever. The switch connects to the ECM through contacts J2-58.
Transmission Control
Transmission Direction Control Lever
The transmission direction control lever (3) contains two switch inputs that are connected to the battery and two switch inputs that are connected to ground. When the transmission direction control lever is in the forward position, the output for the forward direction is closed to ground and the output for the forward direction is closed to the battery. When the transmission direction control lever is not in the forward position both of the outputs are open. When the transmission direction control lever is in the reverse position, the output for the reverse direction is closed to ground and the output for the reverse direction is closed to the battery. When the transmission direction control lever is not in the reverse position both of the outputs are open. When the transmission direction control lever is in the neutral position, all four of the inputs should be open. The transmission direction control lever connects to the ECM through contacts J2-59, J2-60, J1-24, and J1-25.
Transmission Speed Selector
The speed and the direction of the machine are determined by the position of the transmission speed selector and the position of the speed selector. The transmission speed selector sends information about the requested speed to the machine ECM over the CAT data link.