CM870 and ISX Engines – FAULT CODE 2376

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Overview

EGR Temperature Sensor Circuit SMALL | MEDIUM | LARGE

Circuit Description

The EGR temperature sensor is used to measure the temperature of the exhaust gas that exits the EGR cooler. The ECM uses this temperature to control emissions levels of the engine

Component Location

The EGR temperature sensor is located on the front EGR connection tube between the EGR cooler and the EGR mixer. Refer to Section E for a detailed component location view.

Shop Talk

Beginning with ESN 14039654, the temperature sensor return circuit was separated from the pressure sensor return circuit. For ESNs prior to this and with engine wiring harness Part Number 3682854, refer to the Common Pressure/Temperature Sensor Return Circuit above. For this ESN and greater or for any other engine wiring harness part number, refer to the Separate Pressure/Temperature Sensor Return Circuit above.

This fault code is set active if the sensor signal voltage is below the normal operating range for the sensor and the ECM has commanded the EGR valve open. This fault code will not be set active if the ECM has commanded the EGR valve closed. However, once the fault code is set, it will remain active independent of whether the EGR valve is open or closed.

The EGR temperature sensor shares return wires in the engine harness with other sensors. A shorted return can cause multiple fault codes to be active. Before troubleshooting Fault Code 2376, check for multiple fault codes.

Possible causes of this fault code include:

• Signal shorted to ground in the harness or ECM
• Signal shorted to return or ground in the sensor.

Refer to Troubleshooting Fault Code t05-2376