This Cummins 323 fault document is a 30-page diagnostic procedure for Fault Code 323 on the ISB6.7 CM2150 injector solenoid driver circuit. It explains the code reason, circuit operation, active-fault behavior, INSITE checks, harness inspection, resistance tests, injector isolation, ECM replacement authorization, and final clearing steps.
Official Cummins 323 fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; injector solenoid driver cylinder 5 circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 03-Aug-2010; Last Modified: 12-Oct-2010 |
| Pages | 30 |
| 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
- STEP 1. Check for active fault codes.
- STEP 2. Check the injector and injector circuit for an open circuit.
- Guided Step 3E – Check the engine harness for short circuits.
- Guided Step 4B-2 – Injector isolation.
- Guided Step 5B – Clear the inactive fault codes.
Applicable truck models
This procedure applies to Cummins ISB6.7 CM2150 engines in the 2007-09 DTC group, specifically Fault Code 323, PID S005, SPN 655, FMI 5. The extract also references ISB – Injector Circuit and compares related ISC and ISL injector circuit service information where procedures require Procedure 003-011, Procedure 006-026, Procedure 019-031, Procedure 019-032, Procedure 019-043, Procedure 019-360, or Procedure 019-361. For manufacturer information, see Cummins official website.
Who needs this Cummins 323 fault manual
This manual is useful for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber CHECK ENGINE light, rough running, misfire, or disabled cylinder 5 injector event on an ISB6.7 CM2150. It supports structured testing with INSITE™ electronic service tool before replacing an injector, repairing the engine harness, or seeking authorization to replace the ECM.
The diagnostic content centers on Injector Solenoid Driver Cylinder 5 Circuit – Current Below Normal or Open Circuit. The procedure has the technician read active fault codes, decide whether Fault Code 323 is alone or grouped with same bank fault codes, then inspect engine harness connections, injector harness connections, ECM connector pins, pass-through connector pins, seals, locking tabs, moisture, corrosion, wire insulation damage, and pushed back or expanded pins. It includes resistance checks between cylinder 5 SIGNAL and RETURN pins, checks for short circuits to engine block ground, and same bank analysis for rear bank injector circuits. The Cummins 323 fault procedure also describes injector isolation by disconnecting injector wiring, taping harness ends, temporarily placing the valve cover on the engine, clearing codes, idling for 1 minute, and reading codes again. Final steps verify inactive fault status, clear inactive fault codes, and direct the technician back to troubleshooting if same or multiple rear bank injector faults remain active.
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