This document is a Cummins code 144 troubleshooting manual for the Engine Coolant Temperature 1 Sensor Circuit on CM2250 engines. It explains the voltage-above-normal or short-to-high-source fault, related effects, clearing conditions, and guided electrical checks using INSITE™.
Official Cummins code 144 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated CM2250 coverage shown for ISX11.9, ISC8.3 and ISL9, ISX15, GX, QSL9, and QSB6.7 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Coolant Temperature 1 Sensor Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedure coverage |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting revision shown as 30-Dec-2010 |
| Pages | 18 |
| 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 – Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- 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 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine diagnostics where Fault Code 144 is used for the Engine Coolant Temperature 1 Sensor Circuit. The extract specifically lists ISB6.7 CM2250 and also shows associated procedure coverage for ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. Earlier associated listings in the same document include ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISM11 CM876 SN, and ISZ13 CM2150, but the file information identifies the library item under ISB6.7 CM2250 DTCs. Official manufacturer information is available at Cummins official website.
Who needs this Cummins code 144 manual
Workshop owners, diesel mechanics, and diagnostic technicians need this Cummins code 144 manual when an amber CHECK ENGINE light or MIL is linked to high signal voltage or an open coolant temperature circuit. The procedure helps verify whether the cause is the sensor, connector pins, return circuit, signal circuit, engine harness, ECM response, or ECM calibration.
The diagnostic summary states that the ECM supplies 5 volts to the coolant temperature signal circuit and monitors resistance-based voltage changes to determine coolant temperature. The fault sets when coolant temperature signal voltage is greater than 4.95 VDC for more than 1 second; listed effects include possible white smoke, fan staying on if ECM-controlled, and no engine protection for coolant-temperature circuit faults. Guided checks include inspecting the engine coolant temperature sensor connector, measuring sensor resistance from 180 ohms to 160k ohms, checking ECM connector pins, using a jumper at the ECM connector, testing for less than 10 ohms through the harness, checking for greater than 100k ohms on pin-to-pin shorts, reviewing ECM Calibration Revision History, and clearing the code with INSITE™ after repair validation.
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