This Cummins Fault Code DTCs document covers Fault Code 146 for coolant temperature engine protection on Cummins ISB CM550 applications. It explains the coolant temperature sensor circuit, component location, sensor accuracy check, fault disable procedure, and final inactive-code clearing steps for workshop use.
Official Cummins Fault Code DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; coolant temperature – engine protection; coolant temperature sensor circuit |
| Year/Revision | Unknown |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 146
- PID: P110
- SPN: 110
- FMI: 0
- COOLANT TEMPERATURE – ENGINE PROTECTION
- Coolant Temperature Sensor Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Turn key switch ON and verify the sensor accuracy with a thermocouple or similar temperature probe.
- Step 2A) Connect all the components and turn key switch ON. Disable the fault code.
- Step 2B) Connect all components and turn key switch ON. Clear the inactive fault codes using the diagnostic tool.
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) engine diagnostics where Fault Code 146, PID P110, SPN 110, and FMI 0 are used for coolant temperature engine protection. The extract identifies the coolant temperature sensor on top of the thermostat housing and directs the technician to check radiator airflow, compare the service tool monitor reading with a thermocouple or similar temperature probe, and verify whether the code becomes inactive after the repair process. For manufacturer information, visit Cummins official website.
Who needs this Fault Code DTCs manual
This Fault Code DTCs manual is useful for diesel mechanics, fleet maintenance staff, and workshop owners diagnosing coolant temperature sensor circuit faults on ISB CM550 engines. It supports a short, code-specific workflow: inspect for cooling airflow issues, confirm sensor accuracy when possible, replace the coolant temperature sensor if the reading is incorrect, then clear inactive fault codes with the diagnostic tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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