Cummins/Onan ISX15 CM2350 X101 Engine

How to read your Cummins/Onan engine serial & model number →

• Engine Power Output Low
  Cause: Electronic fault codes are active or high counts of inactive fault codes
  Fix: Review instructions for reading active fault codes.
• Engine Difficult to Start or Will Not Start (Exhaust Smoke)
  Cause: Starting procedure is not correct
  Fix: Verify the correct starting procedure. Refer to Procedure 101-014 in Section 1.
• Engine Acceleration or Response Poor
  Cause: Operator technique is not correct
  Fix: Refer to Procedure 101-014 in Section 1.
• Engine Difficult to Start or Will Not Start (No Exhaust Smoke)
  Cause: Fuel level is low in the tank
  Fix: Verify the correct starting procedure. Refer to Procedure 101-014 in Section 1.
• Coolant Temperature Above Normal - Gradual Overheat
  Cause: Charge-air cooler fins, radiator fins, or air conditioner condenser fins are damaged or obstructed with debris
  Fix: Inspect the charge-air cooler, air conditioner condenser, and radiator fins. Clean, if necessary. Refer to Procedure 010-027 in Section 4 and see equipment manufacturer service information.
• Engine Noise Excessive
  Cause: Fan drive belt is loose, tight, or not in alignment
  Fix: Check the fan drive belt. Refer to Procedure 008-087 in Section 5.
• Engine Speed Surges Under Load or in Operating Range
  Cause: Fuel level is low in the tank
  Fix: Fill the supply tank. Refer to equipment manufacturer service information.
• Engine Runs Rough or Misfires
  Cause: Engine is cold
  Fix: Allow the engine to warm to operating temperature. If the engine will not reach operating temperature, refer to the Coolant Temperature Below Normal troubleshooting symptom tree in Section TS.
• Engine Runs Rough at Idle
  Cause: Engine is cold
  Fix: Allow the engine to warm to operating temperature. If the engine will not reach operating temperature, refer to the Coolant Temperature Below Normal troubleshooting symptom tree in Section TS.
• Coolant Temperature Above Normal - Sudden Overheat
  Cause: Coolant level is below specification
  Fix: Check the coolant level. Check for an external leak. Refer to Procedure 008-066 in Section 3. Sample the lubricating oil and have a laboratory check for coolant in the oil (internal leak).
• Engine Will Not Reach Rated Speed (RPM)
  Cause: Vehicle parasitics are excessive
  Fix: Check the vehicle for brakes dragging, transmission malfunction, cooling fan operation cycle time, and engine-driven units. Refer to equipment manufacturer service information.
• Engine Vibration Excessive
  Cause: Belt-driven accessories are malfunctioning
  Fix: Check the fan hub, alternator, refrigerant compressor, and hydraulic pump for interference. Isolate belt-driven accessories and check for vibration. Refer to Procedure 008-036 in Section 6 and Procedure 013-001 in Section A.
• Engine Starts But Will Not Keep Running
  Cause: Fuel level is low in the tank
  Fix: Fill the supply tank. Refer to equipment manufacturer service information.
• Engine Speed Surges at Low or High Idle
  Cause: Fuel level is low in the tank
  Fix: Fill the supply tank. Refer to equipment manufacturer service information.
• Engine Shuts Off Unexpectedly or Dies During Deceleration
  Cause: Engine will not restart
  Fix: Refer to the Engine Difficult to Start or Will Not Start troubleshooting symptom tree in Section TS.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan ISX15 CM2350 X101.

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