27.1 DESCRIPTION OF FLASH CODE 27
Flash Code 27 indicates that the engine Air Temperature Sensor (ATS), see Figure 27-1, input to
the ECM has exceeded 95% (normally >4.75 volts) of the sensor supply voltage.
This code will only be logged during warm engine operation.
This diagnostic condition is typically:
Open sensor signal circuit
Open sensor return circuit
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION