This Cummins 3232 NOx sensor document is a troubleshooting procedure for Fault Code 3232, covering abnormal update rate faults on the aftertreatment intake NOx sensor. It explains the circuit description, conditions for setting and clearing the code, guided checks, and repair direction for J1939 communication, power supply, connector, harness, and ECM calibration issues.
Official Cummins 3232 NOx sensor document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Intake NOx Sensor Circuit |
| Publication no. | 4022254, 4022257, 4022250, 2883445 listed in associated procedures |
| Year/Revision | Last Modified: 21-Dec-2010; guided step section Last Modified: 21-Oct-2010 |
| Pages | 19 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3232 – Aftertreatment Intake NOx Sensor – Abnormal Update Rate
- 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 the fault codes
- Guided Step 2 – Check the aftertreatment intake NOx sensor circuit
- Guided Step 3 – Check the OEM harness
- Guided Step 4 – Check the J1939 data link
- Guided Step 5 – Check ECM calibration and disable the fault code
Applicable truck models
This file applies to Cummins CM2250 engine platforms named in the document: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The procedure is for the aftertreatment intake NOx sensor mounted near the turbocharger turbine outlet, where the sensor and NOx control module are serviced as one component. It addresses SPN 3216 FMI 9, where the ECM detects no communication or an invalid data transfer rate on the J1939 data link. For official manufacturer information, visit Cummins official website.
Who needs this Cummins 3232 NOx sensor manual
This manual is useful for diesel technicians, fleet maintenance teams, and workshop owners diagnosing an amber CHECK ENGINE lamp or MIL caused by Fault Code 3232. It supports structured testing before replacing the aftertreatment intake NOx sensor, including battery voltage supply checks, return circuit checks, connector pin inspection, OEM harness inspection, J1939 terminating resistance measurement, and ECM calibration verification.
The guided steps show how to confirm whether Fault Code 3232 is active, inspect dirty or damaged pins, measure voltage within 1-VDC of battery voltage, check the Electrical System Voltage parameter, and confirm the correct aftertreatment intake NOx sensor for the engine configuration. Later procedures cover battery terminal condition, open circuits in the power supply, short circuits or opens in the SAE J1939 data link, resistance checks such as 50 to 70 ohms and 110 to 130 ohms, and when to repair or replace the harness. The Cummins 3232 NOx sensor PDF is available in the DiagTechPro manuals library, free account required to download.
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