CUP 0517534 - Caterpillar

Illustration 18 g01155039
Joystick (1) Joystick (2) Control Handle (3) SchematicThe joysticks output is also a PWM signal that is approximately 50% duty cycle in the center or neutral position. The factory default values for the joysticks are shown in the two tables below. The joysticks can be calibrated independently, or the joysticks can be calibrated as a group. The factory default values of both joysticks may be viewed with the Electronic Technician or via the Monitoring System.Diagnostic codes are logged when the joysticks output signals are outside the limits shown below.
Table 1
Signal     Minimum Value     Maximum Value    
Frequency     400 Hz     600 Hz    
Duty Cycle     2 %     98 %    
Table 2
Voltage Output    
Position of Joystick     Voltage    Duty Cycle    
Full Forward     1.2 to 1.9 DCV     5%    
Neutral     4.3 to 4.9 DCV     50%    
Full Rear     7.5 to 8.1 DCV     95%    
Full Left     1.2 to 1.9 DCV     5%    
Full Right     7.5 to 8.1 DCV     95%    Switches
Switches can provide three types of switch inputs to the transmission electronic control module (ECM):an open signal, a ground signal and a +battery signal. Switches are open or closed.
When the switch is open, no signal is provided to the corresponding input of the transmission ECM.
When a switch is closed, a ground signal or a +battery signal is provided to the corresponding input of the transmission ECM.Rotary Switch (Variable Shift Control)
Illustration 19 g00779624
Variable Shift Control SwitchThe variable shift control switch is an input of the transmission ECM. The switch allows the selection of a range of points to shift the transmission for each speed. The switch has three inputs to the transmission ECM. The combinations of inputs for each switch position are shown in the following tables.
Table 3
Variable Shift Control Switch Status    
Switch Position     Economy
J2-32     Intermediate
J2-33     Standard
J2-34    
Economy     Closed     Open     Open    
Intermediate     Open     Closed     Open    
Standard     Open     Open     Closed    ReferenceFor more information on the variable shift control, refer to the Service Manual module Operation and Maintenance Manual, "Variable Shift Control" for the machine that is being serviced. Start Switch (Key)
Illustration 20 g00291705
Key Start SwitchThe key start switch is an input of the transmission electronic control module (ECM). The key start switch informs the transmission ECM of an attempt to start the engine. The transmission ECM then initiates the neutral start function. During normal machine operation, the start terminal of the key start switch is open. When the key start switch is turned to the START position, the start terminal closes to the +battery and the +battery voltage is present at connector contact J2-1 of the transmission ECM. When all starting conditions are satisfied, the transmission ECM sends a +battery signal to the connector contact J2-7 for the start relay and engine cranking begins.Note: When the key start switch is in the