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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 4257 FMI 4 (MCM) Injector Amplifier Control Valve Cylinder 1, 2, 3 Shorted to Ground

DESCRIPTION:
This code sets when the MCM detects that there is a short to ground on the circuits for the injector amplifier control valve on cylinders 1, 2 and or 3.

MONITORED PARAMETER:
Injector amplifier control valve cylinder 1, 2, 3.

TYPICAL ENABLING CONDITIONS:
Fuel injector system nozzle opening pressure reading greater than 1.85.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Two seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 25%

VERIFICATION:
Engine rpm 1400 – 1500: One minute.

PROBABLE CAUSES:
1. Connector outside the valve cover.
2. Under valve cover fuel injector harness.
3. Failed fuel injector #1, #2, or #3.
4. Wiring between the valve cover connector and the 120-pin ECM connection.
5. Failed MCM (Engine ECM).

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