MBE 900 DDEC VI Troubleshooting – Section 22.2 SPN 84/FMI 19

Section 22.2
SPN 84/FMI 19

This fault is typically J1939 wheel-based vehicle speed signal from Source #1, #2, or #3 is erratic.‪

Section 22.2.1
Erratic Signal from Source #1, #2, or #3 Check

Check as follows:‪

1. Check for multiple codes:
   1. If CPC SPN 168/FMI 0/14/18 (Battery Voltage) are present troubleshoot and repair these first.
   2. If MCM SPN 625/FMI 9 is present, troubleshoot and repair the CAN line.
   3. If only a “J1939 Error” fault is present, go to the next step.
2. Has the CPC been recently reprogrammed?
   1. If yes, check the proper configuration of the CPC.
   2. If no, connect ServiceLink to determine which modules are configured for the vehicle and their communication status. Once this is done, follow the appropriate module communication troubleshooting procedures for the affected module.