This document is a Cummins fault 145 troubleshooting manual for the engine coolant temperature sensor circuit on Cummins ISB6.7 CM2150 engines. It explains the fault description, sensor circuit behavior, diagnostic conditions, connector checks, ECM response checks, harness resistance tests, and fault clearing steps. The file is intended for technicians using INSITE™ electronic service tool and standard multimeter procedures.
Official Cummins fault 145 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL |
| System/Group | DTCs; Engine Coolant Temperature 1 Sensor Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; last modified 20-Jul-2010 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 145
- 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 Cummins fault 145 document applies to Cummins ISB6.7 CM2150 (2007-09) engine diagnostics, with the fault code page also labeled for ISB, ISC, and ISL engine coolant temperature sensor circuit troubleshooting. It covers Fault Code: 145, PID: P110, SPN: 110, FMI: 4/4, and an amber lamp condition for voltage below normal or shorted to low source on the Engine Coolant Temperature 1 Sensor Circuit. The component location given in the extract places the engine coolant temperature sensor on the thermostat housing. See the manufacturer website at Cummins official site.
Who needs this Cummins fault 145 manual
Workshop owners, diesel mechanics, fleet technicians, and diagnostic specialists need this manual when a Cummins ECM reports low coolant temperature signal voltage, possible white smoke, fan staying ON when ECM-controlled, or loss of engine protection for coolant temperature. The procedure focuses on practical checks: reading active or inactive fault codes with INSITE™ electronic service tool, inspecting connectors for corrosion or damaged pins, verifying sensor response, testing ECM response, and measuring harness shorts above or below the 100k ohms specification shown in the troubleshooting tables.
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