The Cummins fault code 334 troubleshooting manual is the official Cummins diagnostic procedure for the engine coolant temperature sensor circuit on the ISX11.9 CM2250 engine platform. The ECM uses the engine coolant temperature sensor to monitor coolant temperature, reading the voltage on the signal pin and converting it to a temperature value. This 13-page PDF walks a technician from symptom to verified repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12) |
| System / Group | engine coolant temperature sensor circuit, DTCs |
| Fault code reference | Fault Code 334 — SPN 110, FMI 2 |
| Warning lamp | an amber warning lamp |
| Revision (Last Modified) | 11-Jun-2010 |
| Pages | 13 |
| File size | 0.21 MB |
| Format | |
| Language | English |
Cummins fault code 334 document contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and possible causes
- Associated Procedures table
- Guided troubleshooting steps
- Verify the repair
Applicable truck models covered
This procedure applies to Cummins engines that report Fault Code 334 (SPN 110, FMI 2), including the Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12). Always confirm the exact calibration and publication for your engine on the official Cummins engine support site before ordering parts.
Common causes and symptoms
This fault is set when the coolant temperature signal is erratic, intermittent or incorrect, and the ECM estimates coolant temperature until it clears. Shop Talk in the document lists the most likely causes:
- In-range malfunction of the engine coolant temperature sensor
- High resistance in the sensor signal or return lines
Who needs the Cummins fault code 334 manual
Diesel technicians and workshop owners diagnosing Fault Code 334 on ISX11.9 CM2250 trucks need this manual to follow the guided steps, use the correct connector pins and verify the repair with INSITE electronic service tool instead of guessing.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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