Detroit DD16 EPA07 (2007-09) Fault Code: SPN 723 FMI 31 (MCM) Backwards Running Engine Detected
NOTE: This may be due to an engine temporary running in a reverse direction. Symptoms include smoke exiting from intake manifold and a low idle speed, possibly due to a leaky injector.
DESCRIPTION:
This code sets when there is no match of camshaft and crankshaft signals.
MONITORED PARAMETER:
Camshaft reverse direction rising edge signal.
TYPICAL ENABLING CONDITIONS:
Engine state and low idle and camshaft reverse direction error.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Continuous when enabling conditions met.
TYPICAL DURATION:
Two seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
Derate 25% shutdown priority.
VERIFICATION:
Engine idle
NOTE: If any other codes for camshaft, crankshaft, or oil pressure are active fix those first.
NOTE: If codes for throttle pedal or idle validation switch are present, fix those before working on this code.
PROBABLE CAUSES:
1. Failed injector(s).
2. Failed starter (Isn’t doing at least 150 RPM).
3. Failed camshaft position sensor.
4. Gear train, camshaft, or flywheel failure/installation installed improperly.
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