This Cummins 2962 troubleshooting document is a fault-code procedure for an EGR temperature condition on CM2250 engines. It explains Fault Code 2962, SPN 412 FMI 16, where exhaust gas recirculation temperature is valid but above the normal operational range. The file also gives the diagnostic trigger, derate effect, likely causes, and guided repair checks using INSITE™ electronic service tool.
Official Cummins 2962 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Exhaust Gas Recirculation Temperature Sensor Circuit |
| Publication no. | Associated bulletin numbers shown: 4022254, 4022257, 4022250, 2883445, 4022256, 4022255 |
| Year/Revision | Last modified 11-Jun-2010 and 30-Dec-2010; year unknown |
| Pages | 9 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 2962
- 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 cooling system.
- Guided Step 3 – Check the EGR system.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies engine and control-system coverage rather than truck chassis coverage. This Cummins 2962 troubleshooting procedure applies to CM2250 engine families listed in the document, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. For brand and engine support information, visit the Cummins official website.
Who needs this Cummins 2962 troubleshooting manual
This manual is for mechanics and workshop owners diagnosing amber CHECK ENGINE complaints, EGR temperature derate, or Fault Code 2962 with INSITE™ electronic service tool. It is most useful when the fault appears under engine load, because the note states the fault will most likely not be active with no load in the shop.
The procedure describes how the ECM supplies 5 volts to the EGR temperature signal circuit and monitors sensor resistance to calculate EGR flow temperature after the EGR cooler. It states that the diagnostic runs continuously with the keyswitch ON and sets when EGR temperature is greater than 293°C [560°F] for more than 5 seconds. When active, the ECM illuminates the amber CHECK ENGINE light and can derate engine torque up to 40 percent to limit EGR temperature. The troubleshooting path checks for other active fault codes, verifies coolant mixture and coolant level, inspects EGR differential pressure sensor ports and cross drillings for soot or debris, and then checks whether an ECM calibration update is available. Repair actions include correcting coolant mixture, replenishing coolant and investigating coolant loss, clearing debris or replacing the EGR differential pressure tube, cleaning the EGR cooler, calibrating the ECM if needed, and clearing the fault after the conditions for clearing are met. Full PDF available in the DiagTechPro manuals library, free account required to download.
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