This code 144 DTCs document is a troubleshooting procedure for the Engine Coolant Temperature 1 Sensor Circuit on Cummins ISB, ISC, and ISL engines. It explains the voltage-above-normal or short-to-high-source fault, the ECM response, inspection points, sensor resistance checks, harness tests, and fault clearing steps.
Official code 144 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also identifies ISB, ISC, and ISL engine coverage for Engine Coolant Temperature 1 Sensor Circuit troubleshooting. |
| System/Group | DTCs; Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source |
| Publication no. | Not stated in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 144
- 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 engine coolant temperature sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 group and also names ISB, ISC, and ISL engines in the Engine Coolant Temperature 1 Sensor Circuit section. The procedure is aimed at engines where Fault Code: 144, PID: P110, SPN: 110, FMI: 3/3 is active or inactive, with an amber lamp and possible white smoke, fan operation commanded ON if ECM controlled, and no engine protection for coolant temperature. For manufacturer information, visit the official Cummins website.
Who needs this code 144 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when testing a coolant temperature sensor circuit that shows high signal voltage, an open circuit, or a possible short to a voltage source. The steps use INSITE™ electronic service tool checks, multimeter resistance measurements, connector inspection, ECM response testing, and engine harness open-circuit or pin-to-pin short checks.
The document states that the coolant temperature sensor is a variable resistor sensor on the thermostat housing, supplied with 5 volts by the ECM. It gives the active-code threshold as coolant temperature signal voltage greater than 5.13-VDC for more than 1 second, then directs the user through sensor resistance range verification, connector pin condition, shared return wiring concerns, and ECM connector tests before clearing inactive fault codes.
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