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Coolant Temperature – Engine Protection
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 151 PID: P110 SPN: 110 FMI: 0 LAMP: Engine Protection or Red SRT: 00-014 |
Voltage at the coolant temperature signal pin 17 of the sensor harness connector indicates the coolant temperature is above 104°C [219°F]. | Progressive power and speed derate with increasing time after alert. If Engine Protection Shutdown is enabled, the engine will shut down 30 seconds after the engine protection lamp or the Red lamp* starts flashing. |
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Coolant Temperature Sensor Circuit |
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Circuit Description
The coolant temperature sensor is used by the electronic control module
(ECM) to monitor the temperature of the engine coolant. The coolant temperature is used by the ECM for the engine protection system and the timing and fueling control.
Component Location
- M11 – The coolant temperature sensor is located in the front of the thermostat housing support on most M11 applications. On bus applications, the sensor will usually be located at the rear on the thermostat housing support.
- N14 – The coolant temperature sensor is located on the top of the thermostat housing.
Shop Talk
- Make sure the airflow through the radiator is not obstructed.
- *Applies to 98N14 and 98M11 calibrations only.
Troubleshooting Steps
| STEPS | SPECIFICATIONS | |
|---|---|---|
| STEP 1. | Check the sensor accuracy. | |
| STEP 1A. Verify the sensor accuracy with a thermocouple or similar temperature probe. | Sensor reading is correct | |
| STEP 2. | Clear the fault codes. | |
| STEP 2A. Disable the fault code. | Fault Code 151 inactive | |
| STEP 2B. Clear the inactive fault codes. | All fault codes cleared | |
Guided Step 1 – Check the sensor accuracy.
| Guided Step 1A – Verify the sensor accuracy with a thermocouple or similar temperature probe. | |
|---|---|
Conditions
Action
NOTE: If a temperature measuring device is not |
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| OK | NOT OK |
| Sensor reading is correct
Refer to proper base engine manual.
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Does not meet specifications. |
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Fault Code 144
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Guided Step 2 – Clear the fault codes.
| Guided Step 2A – Disable the fault code. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
| Fault Code 151 inactive | Return to the troubleshooting steps or contact your nearest Cummins Authorized Repair Location if all the steps have been completed and checked again. |
| Guided Step 2B – Clear the inactive fault codes. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
| All fault codes cleared | Troubleshoot any remaining active fault codes. |
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Repair complete
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Appropriate troubleshooting chart
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Last Modified: 10-Mar-2003
