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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 51 FMI 2 (MCM) Intake Throttle Position Deviation Error

DESCRIPTION:
This code sets when the Intake Throttle Valve Position has a 15% deviation from the position commanded by the Motor Control Module (MCM) when the engine coolant temperature is above 60°C (140°F).

MONITORED PARAMETER:
Intake Throttle Valve (ITV)

TYPICAL ENABLING CONDITIONS:
Coolant temperature is greater than 60°C (140°F).

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Five seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
10% Derate

VERIFICATION:
Engine rpm = 600 rpm or higher.

POSSIBLE CAUSES:
1. Faulty ITV motor.
2. Faulty ITV position sensor.
3. Sticking ITV.

PROBABLE CAUSES:
1. Air throttle valve harness.
2. ITV harness connector.
3. Intake throttle valve failure.
4. Cold temperatures may falsely cause this code to appear.
5. Intake throttle valve sensor.

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