Cummins ISX12 CM2250 (2010-12) Fault Code: 598 PID: 167 SPN: 167 FMI: 1 Electrical Charging System Voltage- Data Valid But Below Normal Operating Range- Most Severe Level
Circuit Description
The electronic 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 each OEM. Refer to the OEM service manual for the battery location.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes
The ECM detects that the battery voltage is less than a calibrated value.
Action Taken When the Fault Code is Active
The ECM illuminates the red STOP 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 10 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 red STOP ENGINE lamp 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.
Shop Talk
This fault code is part of the Alternator Failure Warning feature. The ECM can increase idle speed and deactivate the idle decrement switch if Idle Speedup is enabled. Use INSITE? electronic service tool to view the Alternator Failure Warning feature settings. Disabling the Alternator Failure Warning feature will also disable this fault code.
Make sure the ECM battery supply (+) is coming directly from the battery and not the starter.
Possible cause of this fault code:
Undercharged batteries caused by a malfunctioning alternator or regulator.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
For intermittent power supply and data link communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.
Possible Cause:
1) Battery Failure
2) Alternator, or OEM Wiring Failure
3) OEM harness
4) ECM calibration
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