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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 51 FMI 18 (MCM) Intake Throttle Position Rationality Error

DESCRIPTION:
This fault sets when intake throttle position does not match requested range.

MONITORED PARAMETER:
Intake throttle valve (ITV).

TYPICAL ENABLING CONDITIONS:
Engine rpm = idle or higher.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Five seconds

DASH LAMPS:
MIL

ENGINE REACTION:
No derate

VERIFICATION:
Engine rpm = idle or higher.

POSSIBLE CAUSES:
1. Damaged ITV butterfly flap.
2. Faulty ITV motor.
3. Faulty ITV sensor.

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

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