The Cummins ISM code 441 manual is a 5-page diagnostic PDF for the unswitched battery supply circuit on the ISM CM570 (1999–2002) engine. It documents how the electronic control module (ECM) draws constant power through the OEM harness and its two in-line 15-amp fuses, and it walks a technician through the yellow-lamp diagnosis step by step.
Cummins ISM code 441 document details
| Brand | Cummins |
| Model coverage | ISM CM570 (1999–2002) |
| System / group | Unswitched battery supply circuit — DTCs |
| DTC number | 441 |
| PID / SPN | P168 / 168 |
| FMI | 1/18 |
| Warning lamp | YELLOW |
| Pages | 5 |
| File format | |
| Language | English |
Document table of contents
- Circuit description and component location
- Shop talk notes
- Battery voltage and 15-amp fuse checks
- OEM harness pin and resistance measurements
- Verification steps 1A through 3B
Applicable truck models
This procedure applies to the ISM CM570 (1999–2002) engine and the shared CM570 fuel-system platform found in on-highway trucks. The same fault-code logic is carried across related CM570 engine families of that era. For engine identification and factory service references, see the manufacturer at the Cummins official website.
Who needs this Cummins ISM code 441 manual
The document explains that the ECM receives unswitched battery power through two in-line 15-amp fuses in the OEM harness, with battery return wires bolted directly to the negative terminal. Its troubleshooting tree measures battery voltage (at least 12 VDC normally, 6.2 VDC during cranking), verifies the two 15-amp fuses are installed and not blown, inspects the OEM connector pins, and checks harness resistance across pins 7, 8, 17, 18, and 28. Cleaning of contacts uses Part Number 3824510.
This guide suits diesel technicians and workshop owners who face a battery-supply fault on the ISM CM570 and want the full pin-out resistance procedure rather than guesswork. It reads as fault code 441 troubleshooting steps for the unswitched battery supply circuit, keeping the diagnosis ordered and evidence-based.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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