Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 5879 PID: SPN: 3464 FMI: 3 Electronic Throttle Control Actuator Driver Circuit- Voltage Above Normal or Shorted to High Source
Circuit Description
The engine control module (ECM) controls the engine intake air throttle actuator. The ECM can open and close the throttle based on the operating condtions in order to regulate air flow to the engine.
Component Location
The engine intake air throttle actuator is mounted in the piping between the charge air cooler and intake manifold.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position and the engine is running.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the engine intake air throttle actuator signal is shorted to voltage when the actuator is commanded OFF.
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.
Engine intake air throttle actuation will be disabled. The engine intake air throttle will default to the open position.
Exhaust Gas Recirculation (EGR) valve operation will be disabled.
Active and stationary regeneration of the diesel particulate filter will be disabled.
Diesel exhaust fluid injection into the aftertreatment system is disabled.
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
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 immediately after the diagnostic runs and passes.
For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (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
Possible causes of this fault code include:
An open or short circuit to battery in the engine harness.
A malfunctioning engine intake air throttle actuator
Possible Cause:
1) Intake throttle actuator assembly failure
2) Engine harness
3) ECM failure
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