This Cummins ISB injector fault document explains Fault Code 325 for the cylinder 6 injector solenoid driver circuit. It covers current below normal or open circuit troubleshooting, using INSITE™ electronic service tool checks, connector inspections, resistance tests, and injector isolation steps for rear-bank injector circuits.
Official Cummins ISB injector fault 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 6 Circuit |
| Publication no. | Not shown in the extract |
| 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
- Troubleshooting Fault Code 325
- Associated Procedures
- Guided Step 1A – Read the fault codes with INSITE™ electronic service tool
- Guided Step 2D – Check for an open circuit
- Guided Step 3B – Check the injector harness circuits for short circuits to ground
- Guided Step 4B-2 – Injector isolation
- Guided Step 5B – Clear the inactive fault codes
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 coverage group and specifically addresses Fault Code 325, PID S006, SPN 656, FMI 5. The procedures also reference ISB Series 6.7L Engines (CM2100 and CM2150 Common Rail Fuel System) Service Manual, Bulletin 4021578, plus ISC and ISL CM2150 Service Manual, Bulletin 4021569, when injector removal or harness service procedures are needed. The diagnostic describes the rear bank injector circuit shared by cylinders 4, 5, and 6, with cylinder 6 having a dedicated low-side switch inside the ECM. Official manufacturer information is available from Cummins.
Who needs this Cummins ISB injector fault manual
Workshop owners, diesel mechanics, and electrical diagnosticians need this ISB injector fault manual when an engine has an amber CHECK ENGINE light, misfire, rough running, or active same-bank injector codes. It is useful for checking ECM calibration, engine harness connectors, injector pass-through connectors, open circuits below 2 ohms, shorts to ground, and whether injector 4, 5, or 6 isolation changes active faults.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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