ELECTRONICS GP-ENGINE RATINGS 3735355 - Caterpillar

The variable shift control switch is an input of the power train ECM. The switch allows the operator to select a range of operation for the variable shift control feature. The switch has three inputs to the power train ECM. The valid inputs for each switch position are shown in the table that follows. If an invalid input is detected by the power train ECM, the power train ECM records a diagnostic code.
Table 7
Variable Shift Control Switch Status    
Switch Position     Economy
J1-20     Moderate
J1-24     Aggressive
Full Throttle
J1-39    
Economy     G (2)     O (1)     O    
Moderate     O     G     O    
Aggressive
Full throttle     O     O     G    
( 2 ) G means Ground.
( 1 ) O means Open.Switch (Ride Control)
Illustration 8 g00288392
Ride Control SwitchNote: The information for the ride control switch is only applicable for the 980G.The ride control switch tells the power train ECM that the operator wants the transmission to change modes. Refer to System Operation, "Normal Operation" for more information about "Ride Control Operation".The ride control switch has two input connections to the power train ECM. Input 1 at connector contact J1-21 and input 2 at connector contact J1-22 are the two input connections to the power train ECM. The valid input for each switch position is shown in the table that follows.
Table 8
Status for the Ride Control Switch    
Mode     Switch Position     D766-GN
Input 1 J1-21     D767-WH
Input 2 J1-22    
ON     Up     Open     Closed    
OFF     Center     Closed     Closed    
AUTO     Down     Closed     Open    Key Start Switch
Illustration 9 g00291705
Key Start SwitchThe key start switch is an input of the power train ECM. The key start switch tells the power train ECM that the operator wants to start the engine. The power train ECM then initiates the neutral start function. Refer to System Operation, "Normal Operation" for more information about the neutral start operation. During normal machine operation, the start terminal of the key start switch is open. When the key start switch is turned and the key start switch is held in the START position, the start terminal closes to the +battery. Then +battery voltage is present at connector J1-40 of the power train ECM. When all starting conditions are satisfied, the power train ECM sends a +battery signal to the start relay (connector J1-8) and engine cranking begins.Note: After the key start switch is initially turned to the START position, the switch will not return to the START position from the ON position. The switch must first be turned to the OFF position., Then, the switch can be turned to the START position.Options Code Plug
The options code plug is an input of the power train ECM. The options code plug is used to recognize the options that are installed on the machine. This tells the power train ECM the way to function.The inputs of the options code