M11 – 101-002   Electromagnetic Interference (EMI)

General Information


Some engine applications utilize accessories (CB radios, mobile transmitters, etc.) that generate and use radio frequency energy that, if not installed and used properly, can cause electromagnetic interference (EMI) conditions to exist between the accessory and Cummins electronic controlled fuel system. Cummins is not liable for any performance problems with either the fuel system or the accessory due to EMI. EMI is not considered by Cummins to be an engine failure and therefore is not warrantable.

System EMI Susceptibility


Your Cummins product has been designed and tested for minimum sensitivity to incoming electromagnetic energy. Testing has shown that there is no engine performance degradation at relatively high energy levels; however, if very high energy levels are encountered, then some noncritical diagnostic fault code logging can occur. The fuel system EMI susceptibility level will protect your engine from most, if not all, electromagnetic energy-emitting devices that meet the Federal Communications Commission legal requirements.

System EMI Radiation Levels


Your Cummins product has been designed to emit minimum electromagnetic energy. Electronic components are required to pass various Cummins and industry EMI specifications. Testing has shown that when the engine is properly installed, it will not interfere with onboard communication equipment or with the vehicle’s, equipment’s, or vessel’s ability to meet any applicable EMI standards and regulated specifications.

If an interference condition is observed, follow the suggestions below to reduce the amount of interference:

  1. Locate the receiving antenna as far away from the engine and as high as possible.
  2. Locate the receiving antenna as far away as possible from all metal obstructions (e.g., exhaust stacks)
  3. Consult a representative of the accessory supplier in your area to:
  • Accurately calibrate the device for proper frequency, power output, and sensitivity (both base and remote site devices must be properly calibrated)
  • Obtain antenna reflective energy data measurements to determine the optimum antenna location
  • Obtain optimum antenna type and mounting arrangement for your application
  • Make sure your accessory equipment model is built for maximum filtering to reject incoming electromagnetic noise.

Last Modified:  18-Nov-2009