The Cummins ISM code 431 manual is a 13-page diagnostic PDF for the idle validation switch circuit on the ISM CM570 (1999–2002) engine. It explains the idle validation switch that tells the electronic control module (ECM) whether the accelerator pedal is at on-idle or off-idle, and it is the longest tree in this group at thirteen pages.
Cummins ISM code 431 document details
| Brand | Cummins |
| Model coverage | ISM CM570 (1999–2002) |
| System / group | Idle validation switch circuit — DTCs |
| DTC number | 431 |
| PID / SPN | S230 / 558 |
| FMI | 2/2 |
| Warning lamp | YELLOW |
| Pages | 13 |
| File format | |
| Language | English |
Document table of contents
- Circuit description and component location
- Shop talk and ISS versus NISS resistance
- Accelerator pedal calibration
- Idle validation switch resistance branches
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 431 manual
The document places the integrated sensor switch (ISS) on the accelerator pedal assembly and notes the fault is usually a loose connection, an uncalibrated pedal, or a miswired idle validation switch. It records that the integrated sensor switch has a 125-ohm idle-validation-switch resistance specification, compared with 10 ohms for a non-integrated sensor switch. The procedure verifies the pedal connection, calibrates the accelerator pedal to the full-fuel position, and works through the many branches of the resistance tests.
This guide suits diesel technicians and workshop owners who face an intermittent idle-validation switch complaint and need the ISS resistance specifications and calibration path. It reads as fault code 431 troubleshooting steps for the idle validation switch 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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