Detroit DD15 GHG14 (2014-16) Fault Code: SPN 188 FMI 31 (MCM) Idle Speed is Higher Than Targeted Idle Speed
DESCRIPTION:
Idle speed out of range.
MONITORED PARAMETER:
Engine rpm
TYPICAL ENABLING CONDITIONS:
Engine rpm = idle.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Continuous when enabling conditions met.
TYPICAL DURATION:
10 seconds
DASH LAMPS:
MIL
VERIFICATION:
Engine Idle: One minute.
PROBABLE CAUSES:
1. If any camshaft or crankshaft codes, fix those first.
2. If any throttle or idle validation switch codes, fix those next.
3. Injector failure.
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