Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 597 PID: PID 167 SPN: 167 FMI: 18 Electrical Charging System Voltage- Data Valid But Below Normal Operational Range- Moderately Severe Level
Circuit Description
The engine control module (ECM) receives constant voltage from the batteries through the unswitched battery wires that are connected directly to the positive (+) battery post. The ECM receives switched battery input through the vehicle keyswitch wire when the vehicle keyswitch is turned ON.
Component Location
The ECM is connected to the battery by the OEM harness. This direct link provides a constant power supply for the ECM. The location of the battery will vary with the original equipment manufacturer (OEM). Refer to the OEM service manual.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the battery voltage was less than a calibratible value.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp 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 immediately after 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
This fault code is part of the Battery Voltage Monitor feature. The ECM can increase idle speed and deactivate idle decrement switch if Idle Speedup is enabled. Use INSITE™ electronic service tool to view the Battery Voltage Monitor feature settings. Disabling the Battery Voltage Monitor feature will also disable this fault code.
Make sure the ECM unswitched battery supply is coming directly from the battery and not the starter.
Possible causes of this fault code include:
Undercharged batteries caused by a malfunctioning alternator or regulator.
High-current devices on the vehicle such as citizens band radio amplifiers, numerous exterior lights, or other accessories.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Possible Cause:
1) Battery Failure
2) Alternator, or OEM wiring to the Alternator failure
3) Battery Harness failure
4) OEM power harness
5) ECM calibration
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