ISM code 442 DTCs is the DiagTechPro reference page for this Cummins diagnostic fault code 442 document, a 3-page PDF sourced from TruckFaultCodes.com (Copyright 2017) covering the lamp: amber battery 1 voltage – data valid but above normal operational range – moderately severe level isx condition. 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. There is one 30- ampere fuse in the unswitched battery wire to protect the OEM harness. When the condition is detected the ECM logs the fault and illuminates the amber warning lamp.
ISM code 442 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | and ISM – Unswitched Battery Supply Circuit (ISM CM871, 2007-09) |
| System / Group | ISM CM871 (2007-09) / DTCs |
| Fault identifier | Code 442 (PID P168, SPN 168, FMI 0/16) |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com |
| Year / Revision | Copyright 2017 |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Repair verification and clearing fault codes
Applicable truck models
This document applies to Cummins and ISM – Unswitched Battery Supply Circuit electronic engines in the ISM CM871 (2007-09) family used in on-highway and vocational trucks. The ECM is located on the intake side of the engine. The ECM is connected to the battery by the OEM harness. Verify the electronic control module (ECM) calibration is correct. If necessary, recalibrate the ECM. The troubleshooting section walks through connector and pin inspection, circuit measurements and step-by-step checks, then confirms code 442 is inactive before all fault codes are cleared. Verify engine calibration and coverage against the official Cummins engine support site before ordering parts.
Who needs this ISM code 442 DTCs manual
Any mechanic or workshop owner diagnosing code 442 DTCs needs this PDF to follow the factory diagnostic steps in the correct order and avoid replacing parts that are still good. This fault code is logged when the ECM battery supply voltage exceeds +36-VDC.
Related manuals library
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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