Circuit Description
The output device driver is a device used by the electronic control module (ECM) to control the
transmission shift modulation signal.
Component Location
Refer to an OEM diagram for the location of the transmission shift modulator.
Shop Talk
Output device driver could be malfunctioning due to a failed engine harness, a bad ground on the
transmission shift modulator connector, or a bad transmission shift modulator.
Cummins ISB CM550 (1990-94) Fault Code: 599 PID: SID 025 SPN: 640 FMI: 14 Auxiliary Commanded Dual Output Shutdown – Special Instructions
Cummins ISB CM550 (1990-94) Fault Code: 529 PID: SID 051 SPN: 703 FMI: 3 Dual-Output Driver B
Cummins ISB CM550 (1990-94) Fault Code: 528 PID: 93 SPN: 93 FMI: 2 Alternate (Switched) Torque Curve Switch Circuit
Cummins ISB CM550 (1990-94) Fault Code: 527 PID: 154 SPN: 702 FMI: 3 Dual-Output Driver A
Cummins ISB CM550 (1990-94) Fault Code: 524 PID: 113 SPN: 2 FMI: Switched Droop Selection Circuit
Cummins ISB CM550 (1990-94) Fault Code: 517 PID: 252 SPN: FMI: Fuel Pump Valve Feedback Error
