Cummins ISX11.9 CM2250 (2010-12) Fault Code: 3224 PID: SPN: 3490 FMI: 3 Aftertreatment Purge Air Actuator Circuit- Voltage Above Normal, or Shorted to High Source
The aftertreatment purge air actuator is used to purge the aftertreatment fuel injector system of fuel after active regeneration of the aftertreatment diesel particulate filter.
The aftertreatment fuel injector is installed in the exhaust system in the turbocharger adapter pipe. The aftertreatment fuel pressure sensor and aftertreatment fuel shutoff valve are installed in the shutoff valve manifold. The aftertreatment purge air actuator is located above the shutoff valve manifold.
Conditions for Running the Diagnostics
This diagnostic runs when the aftertreatment purge air actuator is commanded OFF.
Conditions for Setting the Fault Codes
The engine control module (ECM) detected a short circuit to battery in the aftertreatment purge air actuator circuit.
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.
Active regeneration of the aftertreatment diesel particulate filter will be disabled until the next key cycle.
Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Conditions for Clearing the Fault Code
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
Possible causes of this fault include:
A short to battery in the aftertreatment purge air actuator circuit
A damaged aftertreatment purge air actuator.
1) Aftertreatment Purge air Actuator failure
2) Engine Harness
3) ECM calibration
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