This Cummins code 145 document is a troubleshooting manual for Fault Code 145 on the engine coolant temperature 1 sensor circuit. It explains the circuit description, fault conditions, ECM actions, connector checks, harness tests, ECM calibration review, and final fault-code clearing steps for Cummins CM2250 applications.
Official Cummins code 145 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, and other CM2150/CM2220 engines in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Coolant Temperature 1 Sensor Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 30-Dec-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 145 – Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low 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
- 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 – Check the ECM calibration and disable the fault code
Applicable truck models
This PDF applies to Cummins ISB6.7 CM2250 fault diagnostics and also references shared procedures for ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 engines. The associated procedure table also lists engine coolant temperature sensor, Electronic Control Module (ECM), ECM Calibration Code, and Engine Wiring Harness procedures across several Cummins engine platforms. For manufacturer information, visit the Cummins official website.
Who needs this Cummins code 145 manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing low signal voltage on the coolant temperature sensor circuit. It is useful when INSITE™ shows Fault Code 145, when the amber CHECK ENGINE light or MIL is active, or when the fan stays on under ECM control.
The procedure identifies Fault Code: 145, PID: P110, SPN: 110, and FMI: 4/4. It states that the ECM detects coolant temperature signal voltage below 0.5-VDC for more than 1 second, then uses a default engine coolant temperature value. The diagnostic path checks for inactive faults, inspects sensor and ECM connector pins, tests circuit response, checks for pin-to-pin and pin-to-ground shorts, reviews calibration revision level, and clears the fault after the diagnostic passes. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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