YOKE AS 1381499 - Caterpillar

Introduction (Power Supplies)
The 3056E Engine has four supplies to the following components:
ECM
Fuel Injection Pump
Pressure sensors
Air inlet heaterECM Power Supply
Illustration 1 g00908039
Schematic for ECMThe power supply to the ECM and the system is drawn from the 24 volt or the 12 volt battery. The power supply for the ECM has the following components:
Battery
disconnect switch
Key start switch
Fuses
Ground bolt
ECM connector
Machine interface connectorNote: The ground bolt is the only component that is mounted on the engine.The Schematic for the ECM shows the main components for a typical power supply circuit. Battery voltage is normally connected to the ECM. The input from the key start switch turns on the ECM .The wiring harness can be bypassed for troubleshooting purposes.The display screen on the Caterpillar electronic technician (Cat ET) can be used in order to check the voltage supply. Note: Two wires are used to reduce resistance.Power Supply for the Fuel Injection Pump
Illustration 2 g00895884
Schematic for the fuel injection pump
Illustration 3 g00896034
Connection for the fuel injection pump (J40/P40)
Illustration 4 g00896003
Connector for the fuel injection pump (J40) (1) Can L (2) Can H (3) Extra connection (4) Extra Connection (5) Fuel shutoff (6) Battery - (7) Battery + (8) Engine Position (9) Extra connectionThe power supply for the ECM comes from the Machine interface connector. The machine interface connector receives power from the power relay.Power Supply for the Pressure Sensors
Illustration 5 g00896073
Schematic for pressure sensorsThe ECM supplies 5.0 0.2 DC volts through the ECM connector to each sensor. The power supply is protected against short circuits. A short in a sensor or a wiring harness will not cause damage to the ECM.Power supply of the Air Inlet Heater
Illustration 6 g00919204
Schematic for air inlet heaterThe Air inlet heater is powered from the power relay that is controlled by the ECM. A resistor is used On 24V systems .