ROD AS 2621924 - Caterpillar

Pressure Switch (Parking Brake)
Illustration 1 g00381992
Pressure Switch (Parking Brake)
The Parking Brake pressure switch is an input of the ECM. The Parking Brake pressure switch connects to connector contact J1-26. The switch signals the ECM when the secondary brakes or the parking brake is applied. When the switch is activated, the ECM enables the rapid downshift function. The function allows the transmission to be downshifted without a 2.3 second delay.The switch has a connector with two contacts. Contact 1 connects to the ECM at J1-26. Contact 2 is the ground contact that connects to the ECM at J1-15. The ECM records failures that occur with the switch as a CID 0627.Pressure Switch (Service Brake)
Illustration 2 g00497224
Pressure Switch (Service Brake)
The Service Brake pressure switch is an input of the ECM. The Service Brake pressure switch connects to contact J1-25. The switch signals the ECM when the manual retarder or the auto retarder are engaged. The switch also tells the ECM when the service brakes are applied. The operator activates the Retarder Control valve with the hand lever. The ECM then initiates the elevated downshift function. The ECM then enables the rapid downshift function.The switch has a connector with two contacts. Contact 1 connects to the ECM at J1-25. Contact 2 is the ground contact that connects to the ECM at J1-15. The ECM records failures that occur with the switch as a CID 704.Pressure Switch (Steering Low)
789C & 793C Only
Illustration 3 g00497236
Pressure Switch (Steering Low)
The Steering Low-pressure switch is an input to the ECM. The pressure switch connects to J1-37. When the steering pressure drops below 1400 140 kPa (203 20 psi) the switch opens. The ECM identifies a low pressure in the steering system. The switch closes when the steering pressure reaches 1900 kPa (275 psi).The switch has three contacts in the harness connector. Contact "A" is connected to frame ground. Contact "B" connects to the ECM at J1-37.Pressure Switch (Transmission Lube Filter)
Illustration 4 g00304427
Pressure Switch (Transmission Lube Filter)
The Transmission Lube Filter pressure switch is an input to the ECM. The switch connects to J1-20. The switch has a plunger within the switch that closes the contacts with an acceptable pressure drop across the filter. During normal operation, the switch grounds the signal circuit. When the pressure across the filter is greater than the specified value, the switch plunger moves and the switch plunger allow the contacts to open. The open switch tells the ECM that the filter is restricted.The switch has two contacts. One contact connects to J1-20 on the ECM. The other contact connects to frame ground.Pressure Switch (Transmission Charge Filter)
Illustration 5 g00304427
Pressure Switch (Transmission Charge Filter)
The Transmission Charge Filter pressure switch is an input to the ECM. The switch connects to J1-13. The switch has a plunger within the switch that closes the contacts with an acceptable pressure drop across the filter. During normal operation, the switch grounds the signal circuit. When the pressure across the filter is greater than the specified value, the switch plunger moves, allowing the