This Cummins fault code 146 document explains an engine coolant temperature fault for Cummins ISB6.7 CM2150 engines. It covers the coolant temperature sensor circuit, ECM response, diagnostic conditions, fault clearing behavior, and the first troubleshooting step using INSITE™ electronic service tool.
Official Cummins fault code 146 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Engine Coolant Temperature Sensor Circuit |
| Publication no. | Not stated in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 4 pages |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- 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 for sensor circuit fault codes.
- Guided Step 1A – Check for Fault Codes 144 and 145.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 (2007-09) engines and the DTC group for Fault Code: 146, PID: P110, SPN: 110, and FMI: 0/16. The extract also references related service manuals for ISB CM2100 and CM2150, ISBe and ISDe CM2150, B3.3 and QSB3.3 CM2150, ISC and ISL Engines CM2150, and ISLe CM2150 when the technician is directed to the Engine Coolant Temperature Above Normal symptom tree. For manufacturer information, visit Cummins official website.
Who needs this Cummins fault code 146 manual
This manual is for mechanics, fleet technicians, and workshop owners diagnosing an amber lamp coolant temperature warning where the ECM sees data valid but above the normal operational range. It is useful when checking whether Fault Codes 144 and 145 are active before moving to the applicable engine coolant temperature symptom tree.
The procedure states that the engine coolant temperature sensor is a variable resistor sensor supplied with 5 volts by the ECM on the coolant temperature signal circuit. The sensor is located on the exhaust side of the engine near the thermostat housing, and the ECM uses the coolant temperature value for engine protection and emissions control. When the coolant temperature exceeds the calibratible engine protection warning limit, the ECM logs the fault immediately, reduces torque output, disables exhaust gas recirculation (EGR) valve operation, and may allow shutdown if the Engine Protection Shutdown feature is enabled. The fault turns off when coolant temperature decreases below the engine protection limit. The Shop Talk note instructs technicians to verify ECM calibration, review QuickServe® Online calibration revision history for applicable fixes, and recalibrate if necessary by referring to Procedure 019-032 in Section 19.
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