This fault code 131 DTCs document is a 6-page troubleshooting PDF for the ISB CM550 DTC group. It identifies Fault Code 131 with PID P091, SPN 091, and FMI 3 or 4, described as an accelerator position sensor circuit fault. The sampled procedure also includes diagnostic steps for related 5-VDC sensor supply checks, oil pressure sensor tests, ECM connector inspection, harness resistance checks, and final code clearing.
Official fault code 131 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; accelerator position sensor circuit and related sensor supply troubleshooting |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; source page shows Copywrite 2017 |
| Pages | 6 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 131
- PID: P091
- SPN: 091
- FMI: 3 OR 4
- ACCELERATOR POSITION SENSOR CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Fault code reading with diagnostic tool
- Oil pressure sensor connector inspection
- Oil pressure sensor supply voltage check
- Oil pressure sensor signal voltage check
- ECM and engine harness connector inspection
- Open circuit, short to ground, and pin-to-pin resistance checks
- Fault code disable, engine idle verification, and inactive code clearing
Applicable truck models
This file is listed for Cummins ISB CM550 (1990-94) engines in the DTCs group. The extract does not name a truck make or chassis model, so application should be confirmed against the engine control module, OEM accelerator pedal wiring, and harness pin assignments before use. The component location section states that the accelerator position sensor is located on the accelerator pedal, while later steps reference the oil pressure sensor, engine harness, and ECM connectors. For current manufacturer information, visit Cummins official website.
Who needs this fault code 131 DTCs manual
Workshop technicians, mobile diesel mechanics, and fleet maintenance staff can use this manual when diagnosing active or inactive DTCs involving the accelerator position sensor circuit, 5-VDC supply wiring, or related harness faults on the covered ISB CM550 platform. It is most useful when a diagnostic tool is available to read, disable, and clear fault codes after repair.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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