HARNESS ASSEMBLY-FRONT CHASSIS 1090681 - Caterpillar

Table 2
Engine And Hydraulic Pump Control (Connector 1) (1)    
No.1     Function     Type    
1     +Battery (Unswitched)     Power    
2     Ground     Ground    
3     +Battery (Switched)     Switch Input (Keystart)    
4     Key start     Switch Input (Operational)    
11     +Battery (Unswitched)     Power    
12     Ground     Ground    
13     Engine Speed Dial 1     Switch Input (Operational)    
14     Engine Speed Dial 2     Switch Input (Operational)    
15     Data Link (+)     Input/Output    
16     Data Link (-)     Input/Output    
21     AIH Indicator (2)     Switch Input (Operational)    
22     Fine Swing     Switch Input (Operational)    
23     Engine Speed Dial 3     Switch Input (Operational)    
24     Enging Speed Dial 4     Switch Input (Operational)    
31     RS232C (TX)     Input/Output    
32     RS232C (RX)     Input/Output    
33     RS232C (GND)     Input/Output    
34     Low Idle     Switch Input (Operational)    
39     Hydraulic Oil Filter        
( 1 ) The connector contacts that are not listed are not used. The connector has 40 contacts.
( 2 ) Not available on the 330B.When the controller determines that it is necessary to change the speed of the engine and the output of the hydraulic pump, the controller will actuate the governor actuator and the proportional reducing valve. Each input and output of the controller is connected to the machine harness through two 40-pin connectors. Input/Output
The data link is a bidirectional component. The data link allows the controller to receive information and the controller can send information. The data link is designed to allow communication between the controller and the monitor. The data link is not a visible component. The data link consists of internal control circuits and the connecting harness wiring. The controller sends information through the data link. The following list contains some examples: fuel level, engine coolant temperature and the power mode that is selected to the monitor panel. The controller also receives requested information from the monitor panel. The following list contains some examples: power mode and fine control mode. Input
Each input will describe the status of the machine system. Two types of inputs exist: switch type and sensor type. Switches and harnesses provide an open or ground to the controller. Sensors and harnesses provide a signal that changes to the controller.Switch Input (Keyswitch)
The input of the key start switch connects to the controller through connector 1 and contact 4. The key start switch will provide input information to the controller about the status of the key start switch. When the key start switch is ON this input is at +battery. Switch Input (Operational Type)
The operational switch inputs include the following connector contacts: 2-6, 2-7, 2-8, 2-15, 2-18, 2-26, 2-36, 2-40, 1-13, 1-14, 1-22, 1-23, 1-24, 1-34 and 1-39. Each switch input will provide information about operator requests and machine systems. The condition of