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Voltage Monitor – Very Low Voltage
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 598 PID: P167 SPN: 167 FMI: 1/1 LAMP: Red SRT: |
Very low battery voltage detected by the battery voltage monitor feature. |
Red lamp lit until very low battery voltage condition is corrected. The electronic control module (ECM) can increase idle speed and deactivate idle decrement switch if idle speedup is enabled. The engine will run continuously if ICON™ is active (automotive only). |
 Voltage Monitor Supply Circuit
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Circuit Description
The ECM receives unswitched battery input through the OEM harness. There are two in-line 15-amp fuses in the unswitched battery wire of the OEM harness to protect the engine harness from overheating. The battery return wires are connected directly to the negative (-) battery post.
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 OEM. Use the OEM manual for the battery location.
Shop Talk
Make sure the ECM unswitched battery supply is coming directly from the battery and not the starter.
Possible causes of this fault code:
- Undercharged batteries caused by a faulty alternator or regulator.
Refer to Troubleshooting Fault Code t05-598.
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