Why does a bus er code comes up on my 2007 Harley Davidson ultra glide
"BUS Er" indicates Serial data bus shorted low/open/high. It is number 1 priority DTC fix
If speedometer reads "BUS Er" with the ignition key turned ON with the run/stop switch at RUN with the engine off, check the data bus for an open or short to ground between the data link connector [91A] terminal 3 and ICM connector [10B] terminal 12 on carbureted models, AND on EFI MODELS, ECM connector [78B] terminal 5 , TSSM connector [30B] terminal 3, speedometer connector [39B] terminal 2 or if a tachometer is installed, tachometer connector [108B] terminal 2.
Also check for an open diagnostic test terminal between the data link connector [91A] terminal 3 and the TSM/TSSM connector [30B] terminal 3. With the ignition key turned ON, serial data bus voltage should be typically 0.6-0.8 volts. The range of acceptable voltage is 0-7.0 volts.
Wiggle the instrument and/or vehicle harness to identify possible intermittent problems.
Jul 11, 2014 |
2006 Harley Davidson FLHTI Electra Glide...