Caterpillar 4441-Up (Engine) Engine Engine

• Low Oil Pressure Warning
  Fix: The fault will be active and logged only if the engine has been running for more than 8 seconds. Refer to Troubleshooting, “5 Volt Sensor Supply Circuit - Test”.
• Interruption in signal from Primary Speed/Timing Sensor
  Fix: Stop the engine immediately. Turn the keyswitch to the ‘OFF’ position. Refer to Troubleshooting, “Engine speed/Timing sensor - Test”.
• Flash Code 551 indicates that No Detected Faults have occurred since the ignition keyswitch has been turned to the ON position. 551
• Failure of the Primary Speed/Timing Sensor
  Fix: Refer to Troubleshooting, “Engine speed/Timing sensor - Test”.
• Failure of the Engine Oil Pressure Sensor
  Fix: The diagnostic lamp warns the user about the status of the engine oil pressure sensor. The engine oil pressure related strategies will be disabled in the event of a failure of the engine oil pressure sensor. Refer to Troubleshooting, “5 Volt Sensor Supply Circuit - Test”.
• Failure of the Coolant Temperature Sensor
  Fix: Refer to Troubleshooting, “Engine Temperature Sensor Circuit - Test”.
• An overspeed condition is detected by the Electronic Control Module (ECM). The event code E0190 will be logged if the engine speed exceeds 3300 rpm. E0190

Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar 4441-Up (Engine).

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.