Cummins ISB6.7 CM2150 (2007-09) Fault Code: 597 PID: 167 SPN: 167 FMI: 1 Electrical Charging System Voltage – Data Valid But Below Normal Operating Range – Moderately Severe Level. Low battery voltage detected by the battery voltage monitor feature.
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
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. View the Alternator Failure Warning feature settings using the INSITE™ electronic service tool. Disabling the Alternator Failure Warning 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:
1)Undercharged batteries caused by a malfunctioning alternator or regulator
2)High-current devices on the vehicle such as citizens band radio amplifiers, numerous exterior lights, or other accessories.
Possible repairs:
1)Tighten the battery connections and clean the battery terminals.
2)Charge or replace the battery.
3)Repair or replace the alternator and/or OEM wiring to the alternator.
4)Repair or replace the battery harness.
5)Repair or replace the OEM power harness.
6)Repair or replace the OEM power harness.
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