This Cummins M11 431-ISS guide covers Cummins Fault Code 431 (PID P091, SPN 91, FMI 3, SRT 00-611) for the ISS variant on the CELECT Plus engine. The 5-page yellow-lamp document explains how the ECM reads pedal position through the Integrated Sensor/Switch.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | M11 CELECT Plus (1995-98) |
| System / group | Idle Validation Switch Circuit |
| Fault code | 431 (ISS) |
| PID / SPN | P091 / SPN 91 |
| FMI | 3 |
| Diagnostic lamp | Yellow |
| SRT | 00-611 |
| Pages | 5 |
| File size | 0.3 MB |
| Format | |
| Language | English |
| Source | Cummins fault code reference (TruckFaultCodes.com, 2017) |
Document table of contents
- Circuit description
- Component location
- Shop talk diagnostic notes
- Step-by-step troubleshooting
- Fault verification and clearing codes
Cummins M11 431-ISS checks
The switch tells the ECM when the accelerator pedal is released (on-idle) or depressed (off-idle) and is factory-adjusted to change state at the correct pedal position; on this ISS variant the Integrated Sensor/Switch is built into the accelerator pedal assembly. Shop talk attributes the fault to a loose connection, an uncalibrated pedal, or a mis-wired switch, and notes that breakout cable part number 3824892 is required to check voltage levels. When wiring and sensor checks pass, the manual directs replacing the switch circuit wires between pedal and ECM, routing them around the bulkhead, and re-sealing the openings to keep fumes out of the cab.
Applicable truck models
The sheet applies to the Cummins M11 CELECT Plus (1995-98) with the ISS accelerator pedal assembly. Confirm the pedal-calibration procedure on the official Cummins website.
Who needs this idle validation switch manual
Technicians diagnosing idle or throttle faults on CELECT Plus trucks with the Integrated Sensor/Switch pedal use these voltage and wiring checks.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- Cummins DTCs
- Cummins M11 CELECT Plus (1995-98)
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