DDEC TROUBLESHOOTING
12.1 DESCRIPTION OF FLASH CODE 12
Flash Code 12 indicates that the Variable Speed Governor (VSG) input to the ECM has exceeded
95% (normally >4.75 volts) of the sensor supply voltage. This diagnostic condition is typically:
Open sensor return circuit
Sensor signal circuit is shorted to the sensor +5 volt supply
Throttle sensor not adjusted properly at full throttle
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
12-3
