Service Memorandum (SM1903) includes basic troubleshooting steps for Cummins engines with "Aftertreatment...
Blue Bird technical service bulletin SM1903 for 2017-2019 Blue Bird All American, 2017-2019 Blue Bird Vision and 2020 Blue Bird All American School Bus and others.
- Bulletin number
- SM1903
- Component
- Electrical system
- Summary
- Service Memorandum (SM1903) includes basic troubleshooting steps for Cummins engines with "Aftertreatment Abnormal Update Rate Fault Codes". These codes indicate either a problem with the aftertreatment battery power/ground circuits, the proprietary data link circuits, or one of the components connected to the proprietary data link. Both Cummins and Blue Bird harnesses include the proprietary data link circuits, and power/ground circuits. Blue Bird harnesses include the aftertreatment powerground circuits, and the proprietary data link circuits on the OEM side of the 14-pin crossover connector that plugs to the Cummins engine harness. The Blue Bird supplied circuits go from the 14 pin OEM crossover connector to the SCR sensor table, DPF sensor table, and the DEF tank sensor. Proprietary data link circuits DO NOT go the the diagnostic port connector located inside the cab of the bus.
Vehicles covered
VIN decoder
See the problems and recalls for an exact car
Buying a used Blue Bird All American?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history