DDEC III/IV Single ECM Troubleshooting

Section 56.1 Description of Flash Code 56

Section 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 "ECM" , 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.


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

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