Sae J193973 Pdf Exclusive [NEW]

If you are working on a 2025 electric school bus or a hydrogen fuel cell truck, the old PDFs won't work. You need the current revision. Yes.

Your DTC reads: SPN 91 FMI 3

Go to the SPN index. Step 2 (Look up SPN 91): You find "Accelerator Pedal Position 1." Step 3 (Look up FMI 3): You go to the FMI table. FMI 3 = "Voltage Above Normal or Shorted High." Step 4 (The Diagnosis): You don't just guess. The PDF tells you that combination means the ECU sees 5+ volts on the pedal sensor circuit when it should see 0.5-4.5 volts. You now know to look for a short to power. sae j193973 pdf exclusive