BONNET-OIL COOLER 7N7876 - Caterpillar

Illustration 13 g03095876The switch tells the ECM when the operator has the lock lever in the locked position. The ECM will log a diagnostic code of CID 0626 for the switch.
Table 4
Switch Status
Switch Position Normally Open Normally Closed
Locked Closed Open
Unlocked Open Closed STIC Control
Illustration 14 g01444766Upshift
The upshift switch tells the ECM that the operator wants the transmission to upshift one gear.
Table 5
Switch Status
Position Normally Open Normally Closed
Depressed Closed Open
Released Open Closed Downshift
The downshift switch tells the ECM that the operator wants the transmission to downshift one gear.
Table 6
Switch Status
Position Normally Open Normally Closed
Depressed Closed Open
Released Open Closed Direction
The direction switch has three positions: forward, neutral and reverse. The operator selects the direction of the transmission through the switch.
Table 7
Switch Status
Position Reverse Neutral Forward
Reverse Closed Open Open
Neutral Open Closed Open
Forward Open Open Closed Outputs
The ECMs respond to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician. The outputs of the ECM are listed in Tables 1 and 1.Solenoids
Transmission Clutch Solenoids
Illustration 15 g01444279The solenoids engage the speed clutches and direction clutches in the transmission.Note: Do not apply direct battery voltage to the solenoids. The solenoids are not designed for operating with 24 VDC.Torque Converter Lockup Clutch Solenoid (If Equipped)
Illustration 16 g01444286The solenoid functions as a proportional valve. The solenoid modulates hydraulic pressure to the lockup clutch. The ECM increases the PWM Driver to the solenoid valve and the hydraulic pressure at the lockup clutch is increased. The ECM decreases the PWM Driver to the solenoid valve and the hydraulic pressure at the lockup clutch is at a minimum.Torque Converter Impeller Clutch Solenoid
Illustration 17 g01444281The solenoid functions as a proportional valve. The solenoid modulates hydraulic pressure to the impeller clutch.Data Link
Cat Data Link
The Cat Data Link is an input/output of the ECM. The data link uses the connector for the service port in order to communicate with the Caterpillar Electronic Technician. A data link connection is provided for the product link.Note: The control for the product link provides a global positioning system for the machine.The data link is bidirectional. The bidirectional link allows the ECM to input information and output information. The data link consists of the following parts: internal ECM circuits, the related harness wiring, the service tool connector and the connector for the product link. The Cat Data Link connects to the ECM at contact J1-10 (wire 893-GN(Green)) and contact J1-20 (wire 892-BR(Brown)).
The ECM receives commands from the Cat ET in order to change the operating modes. The Cat ET will read the service codes that are stored in the memory of the ECM. The Cat ET will clear the service codes that are stored in the memory of the ECM.
The ECM sends the input and the output information to the Caterpillar ET. Note: An electronic control module that uses the Cat Data Link will have a module identifier. The MID for the Machine Electronic Control Module is 039.CAN Data Link
A data link is required for