This ISB injector fault DTCs document explains Fault Code 331 for the cylinder 2 injector solenoid driver circuit. It describes a current below normal or open circuit condition, with amber CHECK ENGINE lamp behavior and possible misfire or rough running. The PDF is written as a diagnostic troubleshooting procedure using INSITE™ electronic service tool checks, resistance measurements, harness inspections, and injector isolation steps.
Official ISB injector fault DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); references also include ISC and ISL CM2150 service procedures |
| System/Group | DTCs; Injector Solenoid Driver Cylinder 2 Circuit |
| Year/Revision | Unknown; last modified 12-Oct-2010 |
| Pages | 32 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check for active fault codes
- Guided Step 2 – Check the injector and injector circuit for an open circuit
- Guided Step 3 – Check injector harness circuits for short circuits to ground
- Guided Step 4 – Injector isolation
- Guided Step 5 – Clear the inactive fault codes
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines in the 2007-09 coverage group. The text also points technicians to ISB Series 6.7L Engines (CM2100 and CM2150 Common Rail Fuel System) Service Manual procedures and to ISC and ISL CM2150 Service Manual references when checking or replacing injectors and related wiring. For manufacturer information, visit Cummins official website.
Who needs this ISB injector fault DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this file when diagnosing Fault Code 331, PID S002, SPN 652, FMI 5 on a Cummins engine. It is useful when the active code points to cylinder 2 injector supply or return pin issues, high resistance, no current, connector damage, pass-through connector faults, or possible ECM replacement after the guided checks are complete.
The procedure explains that the ECM energizes injector solenoid valves through high-side and low-side switches. Cylinders 1, 2, and 3 share the front bank high-side switch, while cylinders 4, 5, and 6 share the rear bank high-side switch. The guide separates single injector faults from multiple same bank injector fault codes, then directs the user through connector inspection, continuity checks below 2 ohms, short-to-ground measurements, rocker housing harness concerns, injector isolation, and final clearing of inactive fault codes with INSITE™. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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