This Cummins fault code 755 reference documents the Cummins fault code 755 fuel injector fault (PID 157, SPN 157, FMI 7/7, yellow 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 755 (PID 157, SPN 157, FMI 7/7) |
| 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 injector location
- Shop talk – front fuel rail pressure
- Cylinder contribution test
- Injector replacement and verification
Diagnostic steps in the Cummins fault code 755 document
The electronic control module measures fuel metered to each injector using the front fuel rail pressure sensor, and sets the code when it detects no fuel entering an injector, which air in the fuel can cause. Troubleshooting checks drain-line restriction below 4.0 in Hg and for air in the fuel, then uses the diagnostic tool to find the cylinder with the lowest contribution and replace that injector.
The Fuel injector – no fuel entering injector 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 755 manual
It is for technicians pinpointing a dead or low-contributing injector on a Cummins ISM CM570 front bank before condemning parts.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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