This Cummins fault 3326 document is a troubleshooting PDF for the SAE J1939 multiplexed accelerator pedal or lever sensor system abnormal update rate. It explains why the ECM does not receive the expected multiplexed accelerator message, why the engine may only idle, and how INSITE™ is used during diagnosis.
Official Cummins fault 3326 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL8.9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, QSB6.7 CM2250, ISB4.5, ISD4.5, ISD6.7 CM2150, ISL8.9 CM2150, ISM11 CM876, and ISZ13 CM2150 in associated procedures. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Publication no. | Associated bulletin numbers shown include 4022254, 4022257, 4022250, 2883445, 4022256, 4022255, 4022188, 4022190, 4022196, and 4022133. |
| Year/Revision | Last Modified: 11-Jun-2010 and 08-Dec-2010 |
| Pages | 15 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Fault Code 3326
- 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 ECM communication with INSITE™ electronic service tool
- Guided Step 2 – Check the fault codes
- Guided Step 3 – Check the OEM VECU and engine ECM for proper multiplexing configuration
- Guided Step 4A – Inspect the service data link harness and connector pins
- Guided Step 5 – Check the OEM harness
- Guided Step 6 – Check ECM calibration and clear fault codes
- Guided Step 6B – Disable the fault code
Applicable truck models
This file applies to Cummins CM2250 engine control diagnostics where Fault Code 3326 is used for the SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System – Abnormal Update Rate. The extract lists ISB6.7 CM2250 in the file group and includes associated procedure coverage for multiple Cummins engine models, including ISX11.9 CM2250, ISC8.3 and ISL8.9 CM2250, ISX15 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The J1939 data link wiring and VECU location vary by OEM, so the document directs technicians to OEM service information for vehicle-specific layout and configuration details. Manufacturer information is available at Cummins official website.
Who needs this Cummins fault 3326 manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing an engine that will only idle because the Cummins ECM is not receiving a valid J1939 accelerator message. It is also useful when checking OEM VECU source address setup, service data link wiring, ECM J1939 data link harness resistance, OEM harness connector condition, and ECM calibration status with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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