Deutz Fault Code

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SPN 91 FMI 3

Engine stuck at idle; No throttle response; Service lamp on.

System

Not specified

Symptom

Engine stuck at idle; No throttle response; Service lamp on.

Diagnosis & fix steps

Accelerator Pedal Signal High LOGIC: Signal voltage > 4.5V (Open circuit or short to battery). ACTION: Check the 6-pin pedal connector for moisture. Verify 5V supply and ground. FIX: Replace pedal assembly or repair harness.

Red Seal field insights

These pedals use two sensors for safety. If they don't "agree," the engine will default to idle. Check the "APP1" and "APP2" values in your scan tool.

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