Introduction (Power Supplies)
The C6.6 marine generator set supplies power to the ECM.
The ECM powers the following components:
- All sensors on the engine
- The solenoid for the fuel injection pump
- Diagnostic connector
- Electronic unit injectors
The glow plugs are powered directly from the battery.
ECM Power Supply
 | |
| Illustration 1 | g01771213 |
Schematic for the keyswitch and battery supply circuit on engines with an EMCP3 control panel | |
 | |
| Illustration 2 | g01771214 |
Schematic for the keyswitch and battery supply circuit on engines with an MCS control panel | |
The 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
- Ignition keyswitch
- Fuses
- Ground bolt
- ECM connector
- Machine interface 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
 | |
| Illustration 3 | g01334437 |
Schematic for pressure sensors | |
The 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 for the Glow plugs
 | |
| Illustration 4 | g01771215 |
Schematic for the glow plugs on engines with an EMCP3 control panel | |
 | |
| Illustration 5 | g01771216 |
Schematic for the glow plugs on engines with an MCS control panel | |
Note: For a 12 Volt supply, the circuit breaker is rated at 135 Amp. For a 24 Volt supply, the circuit breaker is rated at 90 Amp.