Magnum MMG25FHICAN6 troubleshooting: 31 fault codes and 6 symptom-cause-remedy entries from the manufacturer's own service documentation.
Magnum MMG25FHICAN6 — full specs, parts & maintenance.
| Code | Meaning |
|---|---|
| 20 | PickupFault — Failure of the magnetic pick up sensor for speed measurement. |
| 21 | Sd IOM fail — IOM/IGS-PTM module. |
| 22 | SprinkIActive — The protection is active if the output Sprinkler is closed. |
| 23 | Start failed — Unit did not start. |
| 24 | Stop fail — Unit did not stop. |
| 25 | Ubat — Battery voltage is out of limits given by Batt Undervolt setpoints. |
| 26 | Underspeed — During starting of the engine, when the RPM reaches the value of Starting RPM setpoint, the starter is switched off and the speed of the engine can drop under Start RPM again. Then the Underspeed protection becomes active. Protection evaluation starts 5 seconds after startup. |
| 27 | Vgen<, > — The generator voltage is out of limits given by Gen <V and Gen <V setpoints. |
| 28 | Vgen unbal — The generator voltage is unbalanced more than the value of Volt unbal setpoint. |
| 29 | Wrn ECU Alarm — ECU alarm list is not empty. |
| 30 | Wrn RA15 fail — Warning alarm in case of lost connection to IGL=RA15 module. |
| 31 | WrnMaintenance — The period for servicing is set by the WrnMaintenance setpoint. The protection comes active if the running hours of the engine reach this value. |
| SPN:100 | EngOil Press |
| SPN:102 | Boost Press |
| SPN:105 | Intake Temp |
| SPN:110 | EngCool Temp |
| SPN:175 | EngOil Temp |
| SPN:629 | Controller #1 |
| SPN:636 | PositionSensor |
| SPN:637 | TimingSensor |
| SPN:651 | InjectorCyl#1 |
| SPN:652 | InjectorCyl#2 |
| SPN:653 | InjectorCyl#3 |
| SPN:654 | InjectorCyl#4 |
| SPN:655 | InjectorCyl#5 |
| SPN:656 | InjectorCyl#6 |
| SPN:677 | EngStartRelay |
| SPN:1485 | ECU MainRelay |
| Sd Gen L1 <V | Shutdown Generator Line 1 Voltage Irregularity |
| Sd Gen L2 <V | Shutdown Generator Line 2 Voltage Irregularity |
| Sd Gen L3 <V | Shutdown Generator Line 3 Voltage Irregularity |
| Symptom | Cause | Remedy |
|---|---|---|
| Low Fuel Level Shutdown | Fuel level low; Leaks in the fuel tank; Fuel level sender and connecting wiring damaged | Check the fuel level on the LCD window and confirm the generator is sitting level to ensure an accurate reading; Check for leaks in the fuel tank; If the fuel level is good and no leaks are found, check the fuel level sender and the connecting wiring for damage and check for continuity between the sender and the engine controller |
| Low Oil Pressure Shutdown | Engine oil level low; Oil leaks; Oil pressure sender faulty | Check the level of the engine oil with the dipstick and add oil if required; Visually inspect the engine for oil leaks; If the oil level is good, restart the unit and verify the loss of oil pressure and shut the engine down immediately if the oil pressure value does not read 5 psi (34 kPa) within five seconds; Check the oil pressure sender and refer to the troubleshooting section of the engine operator's manual |
| Low Coolant Level Shutdown | Coolant level low; Visible leaks in coolant hoses, engine block or water pump; Coolant mixed with engine oil | Allow the engine to cool and confirm the unit is sitting level; Check the coolant level in the radiator and add coolant until it is 3/4 in. (1.9 cm) below the filler neck, then secure the radiator cap; Inspect coolant hoses, engine block and water pump for visible leaks; Check the engine oil to verify no coolant has mixed with it and consult the engine operator's manual |
| High Coolant Temperature Shutdown | Coolant level low; Radiator shroud and ducting blocked; Visible leaks in coolant hoses, engine block or water pump; Serpentine drive belt for the water pump loose | Check the coolant level in the overflow jug; Restart the engine and read the coolant temperature to verify High Coolant Temperature Shutdown and stop the engine immediately if the coolant temperature is 230°F (110°C) or more; Allow the engine to cool, add coolant to the overflow jug if it is low and check the level of coolant in the radiator, adding coolant until it is 3/4 in. (1.9 cm) below the filler neck and securing the radiator cap; Check the radiator shroud and ducting for blockage and remove any foreign matter; Inspect coolant hoses, engine block and water pump for visible leaks; Check the tension of the serpentine drive belt for the water pump; If no other problems are found, remove the load on the generator and restart the engine, check the coolant temperature and shut the engine down immediately if it starts to overheat, and consult the engine operator's manual |
| Overcrank Shutdown | Fuel level in the tank low; Fuel pump not operating properly; Air filter blocked | Check the fuel level in the tank; Check for proper operation of the fuel pump; Check the air filter for blockage; If the engine will not start, consult the engine operator's manual for additional information on troubleshooting starting problems |
| Overspeed or Underspeed Shutdown | Engine speed not at 60.0 Hz with no loads on the generator | Disconnect all loads and restart the generator and read the frequency (Hz) on the LCD display (with no loads the frequency should read 60.0 Hz); If the frequency is above or below 60.0 Hz, adjust the engine speed per the engine operator's manual for throttle adjustments on mechanically governed units and the electronic governor manual for electronically controlled units; MMG55FHDCAN6 units will need to contact John Deere with speed related issues since the engine is governed by the John Deere Electronic Engine Control Unit (ECU) |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Fuel level low; Leaks in the fuel tank; Fuel level sender and connecting wiring damaged. See the table for the matching fixes.
Documented causes: Engine oil level low; Oil leaks; Oil pressure sender faulty. See the table for the matching fixes.
Documented causes: Coolant level low; Visible leaks in coolant hoses, engine block or water pump; Coolant mixed with engine oil. See the table for the matching fixes.