This fault code 1973 DTCs document is a troubleshooting PDF for the exhaust gas temperature 3 fault on CM2150 aftertreatment systems. It explains the circuit, fault logic, engine protection action, likely causes, and guided diagnostic steps using INSITE™ electronic service tool. The file is useful when a red STOP ENGINE lamp appears during active diesel particulate filter regeneration.
Official fault code 1973 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL CM2150 procedures |
| System/Group | DTCs; aftertreatment gas temperature sensors; aftertreatment diesel particulate filter outlet temperature sensor |
| Publication no. | Not shown in the extract; related service manual bulletins 4021578 and 4021569 are referenced |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 10 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 1973
- 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 fuel system.
- Guided Step 3 – Check the turbocharger outlet.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This PDF applies to Cummins ISB6.7 CM2150 engines in the 2007-09 emissions group, with procedures also pointing to ISB, ISC, and ISL CM2150 service manuals where aftertreatment inspection or injector replacement is required. The document tells technicians to refer to the OEM service manual for the vehicle aftertreatment system location, so truck model fitment depends on the OEM installation. See the manufacturer source at Cummins official website.
Who needs this fault code 1973 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this fault code 1973 DTCs manual when the ECM reports SPN 3245 FMI 0/0 and the aftertreatment diesel particulate filter outlet temperature is above the most severe protection limit. It supports diagnosis of sensor disagreement, injector misfire, oil or fuel contamination at the turbocharger exhaust outlet, ECM calibration revision, and fault clearing.
The fault is described as Exhaust Gas Temperature 3 – Data Valid but Above Normal Operational Range – Most Severe Level. The ECM sets the code when the aftertreatment diesel particulate sensor outlet temperature is greater than 800°C [1472°F] for 20 seconds during active regeneration, then disables active and stationary regeneration, disables EGR valve operation, and may shut the engine down after 30 seconds depending on calibration. The troubleshooting tree checks active Fault Codes 1877, 1876, or 1878, compares three aftertreatment exhaust gas temperature sensor readings after idle stabilization, uses the Cylinder Cutout Test to find injector misfire, inspects the turbocharger outlet for oil or fuel, and checks whether an ECM calibration update is available. Full PDF available in the DiagTechPro manuals library, free account required to download.
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