Cummins ISX12 CM2250 (2010-12) Fault Code: 1659 PID: SPN: 1328 FMI: 31 Engine Misfire Cylinder 6- Condition Exists - EcuForce Truck (2024)

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Circuit Description
An algorithm in the ECM calibration monitors engine speed as each injector fires while the engine is at idle. If a cylinder has high or low contribution to engine speed, this fault will become active. The intention of this fault is to assist in troubleshooting performance complaints such as engine misfire and low power.

Component Location
The ECM is located on the intake side of the engine.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine coolant temperature is greater than 71?C [160?F].

Conditions for Setting the Fault Codes
If cylinder 6 has high or low contribution to engine speed, this fault will become active.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code
To validate the repair, start the engine and let it idle for up to 5 minutes.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
For On-Board Diagnostic (OBD) engines, the ECM will turn off the MIL after three consecutive trips where the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk
If Fault Code 1659 is inactive in the ECM memory and there is no complaint such as ?low power? or ?engine misfire?, it is possible that an intermittent event, such as air entering the fuel system, following a filter change caused the fault. Inactive counts of Fault Code 1659 should be disregarded unless other performance symptoms are present. The engine coolant temperature must be greater than 71?C [160?F] before this diagnostic will run.

Causes of cylinder misfire can include:

Valve lash out of specification (compare actual valve lash to reset limits)
Cylinder malfunction (check for high blowby when the engine is loaded)
Valve malfunction or valve held open (listen for intake valve ?chirping? noise in the intake)
Cylinder head or gasket malfunction (look for signs of oil, coolant, or casting flash in the intake or exhaust passages)
Extreme camshaft wear (inspect the camshaft lobes for wear)
Extra, missing, or damaged sealing washer under an injector
Injector malfunctions (?swap? injectors to see if the problem ?follows? the indicated injector).
Check air compressor timing (if engine has had fault since new or has had a recent air compressor replacement).

Possible Cause:
1) Cylinder Misfire failure
2) ECM calibration

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Cummins ISX12 CM2250 (2010-12) Fault Code: 1659 PID: SPN: 1328 FMI: 31 Engine Misfire Cylinder 6- Condition Exists - EcuForce Truck (2024)
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