This fault code 144 DTCs document is a 5-page troubleshooting PDF for the coolant temperature sensor circuit on Cummins ISB CM550 engines. It identifies PID P110, SPN 110, FMI 3 or 4, explains how the ECM uses coolant temperature for engine protection, timing, and fueling control, and gives resistance checks for the sensor.
Official fault code 144 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 |
| System/Group | ISB CM550 (1990-94) / DTCs; coolant temperature sensor circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; document copywrite 2017 shown |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 144
- PID: P110
- SPN: 110
- FMI: 3 or 4
- COOLANT TEMPERATURE SENSOR CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Read the fault codes using the diagnostic tool
- Step 2A: Inspect the harness and coolant temperature sensor connector pins
- Step 2B: Check the resistance of the coolant temperature sensor
- Step 2C: Check for a short circuit to ground at the sensor
- Step 3A: Inspect the engine harness and ECM connector pins
- Step 3B: Check for an open circuit between ECM and sensor harness pins
- Step 3C: Check for a short circuit to ground in the engine harness
- Step 3D: Check for a short circuit from pin to pin
- Step 4A: Disable the fault code and verify Fault Code 144 is inactive
- Step 4B: Clear inactive fault codes using the diagnostic tool
Applicable truck models
This PDF applies to Cummins ISB CM550 engine diagnostics in the ISB CM550 (1990-94) DTC group. The extract does not list truck makes or chassis models; it only identifies the engine family, the coolant temperature sensor circuit, and the ECM-related harness checks. The coolant temperature sensor is stated to be located to the front of the thermostat housing. For current engine and service information, see the official Cummins website.
Who needs this fault code 144 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians use this code 144 DTCs manual when diagnosing active or inactive coolant temperature sensor circuit faults. It supports connector inspection, sensor resistance measurement, ECM harness continuity checks, short-to-ground checks, and final fault clearing with a diagnostic tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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