This fault code 151 DTCs document covers the coolant temperature engine protection fault for the Cummins ISB CM550 diagnostic group. It explains how the ECM uses the coolant temperature sensor for engine protection, timing, and fueling control, then outlines the checks needed to confirm whether the fault is inactive and cleared.
Official fault code 151 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: 151
- 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 disable the fault code
- Step 2B) Connect all the components and clear the inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 engines in the 1990-94 coverage stated for the DTC group. The extract does not list truck chassis, vehicle manufacturers, SPN, PID, or FMI values, so application should be confirmed by engine control module family and the active diagnostic fault on the service tool. The coolant temperature sensor is identified as being located on the engine in the thermostat housing area, and the procedure also reminds the technician to make sure airflow through the radiator is not obstructed. For manufacturer information, visit Cummins official website.
Who needs this fault code 151 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this code 151 DTCs manual when checking a coolant temperature sensor circuit fault on an ISB CM550 engine. It is useful when comparing service tool coolant temperature data with a thermocouple or similar temperature probe, disabling the fault code after repairs, verifying that Fault Code 151 is inactive, and clearing inactive fault codes.
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