SPN 91 is a diagnostic trouble code for accelerator pedal position 1 data erratic.
FMI 2 – Intermittent Or Incorrect
FMI 3 – Voltage Above Normal, Or Shorted To High Source
FMI 4 – Voltage Below Normal, Or Shorted To Low Source
FMI 8 – Abnormal Frequency Or Pulse Width Or Period
FMI 9 – Abnormal Update Rate
FMI 19 – Received Network Data In Error
Troubleshoot
APP sensor, check connections or replace
Verify ECM calibration
Other SPN codes:
- SPN 4334 FMI [2-18]
- SPN 3264 FMI [0-16]
- SPN 3226 FMI [2-20]
- SPN 729 MFI [3,4,5]
- SPN 639 FMI [2-19]
- SPN 111 [FMI 1 – 18]
- SPN 103 FMI [2,15,16,18]
- SPN 91 FMI [2-19]
- SPN 84 FMI [2,9,10,19]
- SPN 101 FMI [0 – 16]
- SPN 3058 FMI[10,16,18]
- SPN 641 FMI [7 – 31]
- SPN 1761 FMI[1 – 18]
- SPN 190 FMI [0, 2, 16]
- SPN 3216 FMI 20
- SPN 5246 FMI 0
