DDEC III/IV Single ECM Troubleshooting

Section 27.1 Description of Flash Code 27

Section 27.1
Description of Flash Code 27

Flash Code 27 indicates that the engine Air Temperature Sensor (ATS), see Figure "Air Temperature Sensor" , input to the ECM has exceeded 95% (normally > 4.75 volts) of the sensor supply voltage.‪

Note: This code will only be logged during warm engine operation.

This diagnostic condition is typically:‪

  • Open sensor signal circuit
  • Open sensor return circuit


DDEC III/IV Single ECM Troubleshooting Guide - 6SE497
Generated on 10-13-2008

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