This Cummins fault code 951 reference documents the Cummins fault code 951 cylinder power imbalance fault (PID 166, SPN 166, FMI 2/2, no lamp) on ISM CM570 engines. It is part of the DiagTechPro truck manuals library and preserves the original Cummins ISM CM570 fault-code reference republished by TruckFaultCodes.com (Copyright 2017).
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISM CM570 (1999-2002) engines. |
| System / Group | ISM CM570 (1999-02) / DTCs |
| Fault code | Code 951 (PID 166, SPN 166, FMI 2/2) |
| Source | Cummins ISM CM570 fault-code reference republished by TruckFaultCodes.com (Copyright 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description and ECM location
- Shop talk – cylinder power measurement
- Fuel quality and air checks
- Cylinder Performance Test
Diagnostic steps in the Cummins fault code 951 document
At idle the ECM measures the instantaneous acceleration of each cylinder as it fires and trims fueling to balance them; when the imbalance exceeds pre-defined limits the code is set. Troubleshooting checks fuel quality and for air ingested into the fuel, notes that an inactive count is normal after a filter change, and runs the Cylinder Performance Test to find a high or low cylinder or bank.
The Cylinder power imbalance code on Cummins ISM CM570 engines is read with INSITE and the INLINE datalink adapter; the PID, SPN and FMI values identify the affected circuit and failure type. Work each troubleshooting step in the published order, inspect every connector for corroded, bent or pushed-back pins, and re-verify after the repair by starting the engine, reaching the stated conditions and confirming the code goes inactive before clearing stored codes. Keep the diagnostic log with the repair order for warranty and quality tracking.
Applicable truck models and engines
This document applies to Cummins ISM CM570 (1999-2002) engines. For factory service data, parts and warranty information, consult the official Cummins support site.
Who needs the fault code 951 manual
This reference suits technicians deciding whether a Cummins ISM CM570 power-imbalance count reflects a real cylinder problem or recent fuel-system service.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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