The application supplies power to the ECM. The ECM powers the following components:
- All sensors on the engine and the clean emissions module
- The Nitrogen Oxide (NOx) sensors
- The suction control valve for the fuel injection pump
- The solenoid for the wastegate
- Diagnostic connector
- Electronic unit injectors
The glow plugs are powered directly from the battery.
The engine ECM also controls power to the DEF system. The engine ECM does not power the DEF system.
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| Illustration 1 | g03167497 |
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Typical example | |
The power supply to the ECM and the system is drawn from the 24 V or the 12 V battery. The power supply for the ECM has the following components:
- Battery
- Disconnect switch
- Ignition keyswitch
- Fuses
- Ground bolt
- ECM connector
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 ignition keyswitch turns on the ECM.
The wiring harness can be bypassed for troubleshooting purposes.
The display screen on the electronic service tool can be used in order to check the voltage supply.
Power Supply for the Pressure Sensors
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| Illustration 2 | g03167376 |
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Schematic for pressure sensors | |
The ECM supplies 5 VDC through the J2 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 for the Glow plugs
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| Illustration 3 | g03167499 |
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Typical example | |
Power Supply for the Pump Electronics Tank Unit (PETU)
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| Illustration 4 | g03402800 |
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Typical example of a schematic diagram of the Pump, Electronics, and Tank Unit (PETU) | |