ISM code 131 DTCs identifies a accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source on the Cummins ISM CM871 (2007-09) engine, and this five-page PDF documents SPN 91 / FMI 3/3 (PID P091) in full. It sets out the fault description, component location, shop-talk notes, and a step-by-step troubleshooting tree so a technician can confirm and clear the code with a diagnostic tool.
ISM code 131 DTCs document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) and ISX CM871 (2007-09) |
| System / Group | DTCs / Accelerator Pedal or Lever Position Sensor Circuit |
| PID / SPN / FMI | P091 / SPN 91 / FMI 3/3 |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 5 |
| File size | 0.2 MB |
| Format / Language | PDF / English |
Fault description and meaning
The accelerator position sensor is a potentiometer attached to the accelerator pedal. It varies its signal voltage to the ECM as the pedal is depressed and released, low at 0 percent and high at 100 percent. This document is filed under fault code 131, accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. Because the sensor shares supply and return wires in the engine harness with other sensors, the manual advises checking for multiple active faults before starting the 131 procedure.
Document table of contents
- Fault code information: PID P091, SPN 91, FMI 3/3
- Description
- Component location
- Shop Talk
- Troubleshooting steps (harness, connector, and ECM checks)
- Circuit-repair verification and code clearing
Applicable truck models
This procedure applies to Cummins ISM CM871 (2007-09) engines. The identical fault code and accelerator pedal or lever position sensor circuit also appear in the parallel Cummins ISX CM871 (2007-09) listing. The troubleshooting steps inspect the accelerator pedal or lever position sensor circuit connector pins, verify the 4.75 to 5.25 VDC supply across the sensor, and confirm the fault goes inactive with a diagnostic tool after any repair. Cummins publishes the authoritative service data for these engines on its official website.
Who needs this ISM code 131 DTCs manual
Fleet technicians and workshop owners diagnosing accelerator pedal or lever position sensor circuit complaints on 2007-09 emissions-era Cummins engines need this sheet to work the fault methodically. It pairs with the wider Cummins ISM CM871 DTC set for full engine-harness coverage.
Related manuals library
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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