Deutz Fault Code

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Code 3-1-2 / SPN 110 FMI 4

Cooling Fan Runs Constant Max Speed

System

Cooling

Symptom

Cooling Fan Runs Constant Max Speed

Diagnosis & fix steps

LOGIC: Engine Coolant Temperature Sensor Signal Low (Short to Ground). ACTION: Measure NTC sensor resistance across pins (spec ~2.5kΩ at 20°C). Inspect sensor harness near thermostat housing for insulation rub-through.

Red Seal field insights

Fail-Safe Logic: A shorted sensor tricks the EMR into reading maximum temperature, defaulting cooling fan clutches to full lockup and logging a fault.

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