DDEC TROUBLESHOOTING
28.1 DESCRIROMPTION OF FLASH CODE 28
Flash Code 28 indicates that the engine Air Temperature Sensor (ATS), see Figure 28-1, input to
the ECM has dropped below 5% (normally < 0.25 volts) of the sensor supply voltage.
This diagnostic condition is typically:
Sensor signal circuit is shorted to sensor return
Sensor signal circuit is shorted to ground
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
28-3
