The Engine Monitor is a generator-set controller. It is used on generator sets from Cummins/Onan, including the 50.0 DDB 15R.
Also fitted to: Cummins/Onan 200 DFP 17R (60 Hz), Cummins/Onan 230 DFP 17R (60 Hz), Cummins/Onan DFS 17R / 60Hz, Cummins/Onan DFS 517R / 50Hz.
| Symptom | Cause | Remedy |
|---|---|---|
| Engine runs, shuts down and cranks for 75-seconds. Cranking cycle stops; fault lamp lights | Check fuel supply | |
| Engine runs, shuts down and cranks for 75-seconds; cranking cycle stops; fault lamp lights | Fuel supply | Check fuel supply. |
| Engine runs, shuts down, cranks for 75-seconds, cranking cycle stops, overcrank light ON | Fuel supply | Check fuel supply. |
| Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds | See engine service manual for troubleshooting fuel system; after correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset, then back to the required running position. | |
| Fault lamp lights - no fault condition exists | Be certain that no fault condition exists; Disconnect lead 29, 30 and 31 from TB11 inside control box (refer to wiring diagram); If fault lamp still lights with leads disconnected, remove and replace engine monitor plug-in printed circuit board | |
| Fault lamp lights after engine is running | Oil level - engine will shut down after approximately 12-1/2 seconds if low oil pressure sensor does not open | Check oil level |
| Fault lamp lights and engine shuts down after running for a period | Oil level (engine will shut down if sensor is closed) | Check oil level. |
| Fault lamp lights and engine stops cranking after approximately 75 seconds | See engine service manual for troubleshooting fuel system; After correcting fault, reset monitor by moving run-stop/reset-remote switch to reset position, then to either run or remote to restart engine | |
| Fault lamp lights immediately after engine starts | Overspeed condition as engine starts | Check for overspeed condition as engine starts |
| Fault lamp lights, no fault exists | To check a no-fault condition, disconnect leads from TB11 terminals 29, 30 and 31; if fault lamp lights with leads disconnected, replace engine monitor board; reconnect leads. | |
| High engine temperature fault lamp lights - no fault condition exists | Be certain that no fault condition exists; Remove lead 31 from TB11 inside control box (refer to wiring diagram); If high engine temperature lamp still lights, remove and replace engine monitor plug-in printed circuit board | |
| High engine temperature lamp lights after engine is running | Defective thermostat/thermostats | Check for defective thermostat/thermostats |
| High engine temperature lamp lights as soon as engine starts | Defective sensor or actual high temperature condition | Check for defective sensor or actual high temperature condition |
| High engine temperature light ON, no shutdown | Disconnect wire at TB11-31; light ON after relay reset — replace engine monitor board. | |
| High engine temperature light ON. No shutdown | Disconnect wire at TB11-31; Light ON after relay reset; Replace engine monitor board | |
| High engine temperature shutdown | Coolant level | Check coolant level; replenish if necessary. |
| Low oil pressure fault lamp lights - no fault condition exists | Be certain that no fault condition exists; Disconnect lead 30 from TB11 inside control box (refer to wiring diagram); If low oil pressure lamp still lights, remove and replace engine monitor plug-in printed circuit board | |
| Low oil pressure lamp lights after engine is running | Oil level - engine will shut down after approximately 12-1/2 seconds if oil pressure is low | Check oil level |
| Low oil pressure light ON, no shutdown | Disconnect wire at TB11-30; light ON after relay reset — replace engine monitor board. | |
| Low oil pressure light ON. No shutdown | Disconnect wire at TB11-30; Light ON after relay reset; Replace engine monitor board | |
| Low oil pressure shutdown | Oil level | Check oil level; replenish if necessary. |
| Non-Start: engine fails to start after a few seconds of cranking, or starts and runs then stops and fault lamp lights | Refer to appropriate troubleshooting chart, Table 3 or Table 4 | |
| Overcrank fault lamp lights after engine has run for approximately 75 seconds | Replace start-disconnect circuit board | |
| Overcrank fault lamp lights and engine stops cranking after approximately 75 seconds | See engine service manual for troubleshooting fuel system; After correcting fault, reset monitor by moving run-stop/reset-remote switch to reset position, then to either run or remote to restart engine | |
| Overcrank fault lamp lights and engine stops cranking after approximately 75-seconds | See engine service manual for troubleshooting fuel system; after correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position. | |
| Overspeed lamp lights - no fault condition exists | Replace overspeed circuit board | |
| Overspeed light on, no shutdown | Disconnect wire at TB11-29; light on after reset — replace engine monitor board. | |
| Overspeed shutdown | Governor and throttle linkages, overspeed switch | Check governor and throttle linkages for freedom of movement; check overspeed switch. |
| When pressing test lamp button - one or more fault lamps do not light | Fault lamp/lamps burned out | Replace |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.