Cummins N14 code 331 is the official Cummins injector circuit troubleshooting chart that guides a technician through fault code 331 on N14 CELECT Plus (1995-98) engines. This 7-page PDF from the Cummins service literature explains the injector solenoid circuit, its component location, and the measured checks that confirm the repair before the yellow warning lamp is cleared.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | N14 CELECT Plus (1995-98) |
| System / Group | Injector Circuit |
| Fault code | Code 331 · PID S002 · SPN 735 · FMI 5 |
| SRT operation | 00-605 |
| Warning lamp | Yellow |
| Year / Revision | Copyright 2017 |
| Pages | 7 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Shop talk – possible causes
- Troubleshooting steps
- Fault code verification and clearing
Cummins N14 code 331 troubleshooting summary
The injector solenoid valves are actuated by the electronic control module (ECM) to control fuel metering and timing. Each injector solenoid connects to the ECM through a supply wire and a return wire, and the ECM sends an electrical pulse that closes the normally open valve during injection and metering. On the N14 the external actuator harness runs from the C connector port in the ECM along the rocker boxes to the pass-thru connectors, where the injector pigtail connectors attach. The document works through labelled troubleshooting steps that inspect the connector pins, measure circuit resistance, check for an open circuit and a short circuit to engine block ground, and verify that fault code 331 is inactive after the repair.
Referenced Cummins service items include electronic contact cleaner, Part Number 3824510, and the SRT operation number 00-605 printed on the cover. The chart pairs each measurement with a pass or fail branch so the technician replaces the injector solenoid wire, the pass-thru connector, the actuator harness or the injector only when the reading confirms it.
Applicable truck models
This procedure applies to Cummins N14 CELECT Plus (1995-98) engines as fitted to Class 8 highway trucks. Always confirm the engine dataplate and control parts list before servicing. Full engine data and dealer support are available on the Cummins official website.
Who needs this Cummins N14 code 331 manual
Heavy-duty diesel technicians, fleet service managers and independent workshop owners diagnosing this injector fault rely on the manufacturer procedure instead of swapping parts by guess. The same injector solenoid circuit logic covers the other injector fault codes in the N14 CELECT Plus (1995-98) family, so one reference supports several diagnostic bays.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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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