PIN 1143578 - Caterpillar

Table 2
Contact Description on J2
No. Function
J2-1 Keyswitch Input (Key in the START position)
J2-2 Transmission PTO 1 Enable Output
J2-4 Spare
J2-6 Transmission PTO 2 Enable Output
J2-7 Start Relay
J2-9 Warning Lamp
J2-10 Check Transmission Lamp
J2-11 Shift Inhibit Indicator
J2-12 PWM Trottle
J2-13 LFC Operation Mode
J2-15 Spare
J2-16 Spare
J2-17 Spare
J2-19 Transmission Output Speed Driver
J2-20 Operation Indicator Output
J2-21 LUC Indicator
J2-22 Ground
J2-23 LOC Override N/O
J2-24 Spare
J2-25 Spare
J2-26 Transmission Oil Pressure
J2-27 PWM Shifter Input
J2-28 LFC Speed Control Mode N/O
J2-29 LFC Speed Control Mode N/C
J2-30 PTO #1 Enable Switch
J2-31 PTO #2 Enable Switch
J2-34 Low Flow Const Speed Set Point
J2-35 Shift Selector Switch (N/O)
J2-36 Auto Shift / Manual Shift DTOC - N/O
J2-37 PTO #1 Increment Switch
J2-38 PTO #1 Decrement Switch
J2-39 Spare
J2-40 Shift Selector Swith (N/C)
J2-41 Spare
J2-42 Spare
J2-44 Spare
J2-45 Auto Shift / Manual Shift DTOC - N/C
J2-46 PTO #2 Increment Switch
J2-47 PTO #2 Decrement Switch
J2-50 Spare
J2-51 Spare
J2-52 Park Enable
J2-53 Spare
J2-54 Shifter #2 Altn Max gear
J2-55 Warmup Mode Switch
J2-62 LOC Override N/C
J2-63 Ground
J2-67 CAN High
J2-68 CAN Low
Illustration 1 g01255959
Transmission ECU
Decisions are made by the circuits in the electronic control unit. Software in the electronic control unit activates the electronic circuits in the appropriate way to correctly operate the vehicle. Connectors join the harness wiring to the inputs and outputs of the electronic control unit. There is one connectors with 70 pins. The complete list of diagnostic trouble codes is available with Cat ET.The electronic control unit monitors the condition of the vehicle for proper system operation. Components sense the condition of the vehicle. Components then send electrical signals to the inputs of the electronic control unit. The electronic control unit compares the information from the inputs to the stored information. The electronic control unit then decides if outputs will be activated. The activation is performed by sending electrical signals through the outputs to an electronic circuit.Inputs
Numerous inputs to the electronic control unit are used in order to interrelate with the chassis and to monitor the condition of the transmission. Two types of inputs exist. One type of input is the switch input. The other input device is a sensor. Switches and harness wiring provide signals to the switch inputs of the electronic control module. Switch conditions include open circuit, short to +battery and short to ground. Sensors provide monitored condition signals to the sensor input of the electronic control unit.Outputs
The electronic control module responds to decisions by sending electrical signals through various outputs. The outputs are used for all of the following items:
Create an action.
Provide information to other devices.
Supply sensor power.Input/Output
The Cat Data Link is used to communicate with a service tool. The SAE J1939 Data Link is used to communicated with other electronic control modules (if equipped). The data links are bidirectional. Bidirectional communication allows sharing of information.