CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 214

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Overview

ISX – Engine Oil Temperature Sensor Circuit SMALL | MEDIUM | LARGE

ISM – Engine Oil Temperature Sensor Circuit SMALL | MEDIUM | LARGE

Circuit Description

The engine oil temperature sensor is a variable resistor sensor and is used to measure the temperature of the engine oil in the oil rifle. The electronic control module (ECM) supplies 5 volts to the engine oil temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the engine oil temperature.

The engine oil temperature sensor is used to monitor the engine oil temperature. If the temperature exceeds a calibration limit, an engine protection fault code will be triggered.

Component Location

The engine oil temperature sensor is located on the intake side of the engine. Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes

The ECM detects that the engine oil temperature is greater than 122°C [252°F] for 5 seconds.

Action Taken When the Fault Code is Active

• The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runs and fails.
• The torque output of the engine will be reduced.
• Maximum engine operating speed will be decreased.
• The engine will be shut down if the Engine Protection Shutdown feature is enabled.

Conditions for Clearing the Fault Code

The ECM will turn off the red STOP ENGINE light immediately after the coolant temperature decreases below the engine protection limit.

Shop Talk

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.

This fault code indicates that the engine oil temperature has exceeded the maximum engine protection limit for oil temperature. Troubleshoot the cause of high engine oil temperature.

Refer to Troubleshooting Fault Code t05-214