DDEC TROUBLESHOOTING
56.1 DESCRIPTION OF FLASH CODE 56
Flash Code 56 indicates that the J1587 (diagnostic) data link is no longer allowing the ECM,
see Figure 56-1, to transmit data.
This diagnostic condition is typically:
Either or both of the data link circuits are open at some point in the network.
Either or both of the data link circuits are shorted to ground at some point in the network.
Either or both of the data link circuits are shorted to battery (+) at some point in the network.
The pair of data link circuits are shorted together.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
56-3