{"nhtsa_id":10163352,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-07-29","date":"2019-07-26","document_id":"SM1903","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10163352-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10163352-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10163352","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"BLUE BIRD","model":"ALL AMERICAN","year_from":2017,"year_to":2019,"match":null,"vehicle_ids":[]},{"make":"BLUE BIRD","model":"ALL AMERICAN SCHOOL BUS","year_from":2020,"year_to":2020,"match":null,"vehicle_ids":[]},{"make":"BLUE BIRD","model":"VISION","year_from":2017,"year_to":2019,"match":null,"vehicle_ids":[]},{"make":"BLUE BIRD","model":"VISION SCHOOL BUS","year_from":2020,"year_to":2020,"match":null,"vehicle_ids":[]},{"make":"BLUE BIRD","model":"VISION TRANSIT BUS","year_from":2020,"year_to":2020,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}