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Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2376 PID: P412 SPN: 412 FMI: 4/4 LAMP: Amber SRT: |
Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at EGR temperature circuit. |
EGR valve actuation will be disabled. |
 ISB, ISC, and ISL – Exhaust Gas Recirculation Temperature Sensor Circuit
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Circuit Description
The exhaust gas recirculation (EGR) temperature sensor is a variable resistor sensor and is used to measure the temperature of the EGR gas flow after it exits the EGR cooler. The electronic control module (ECM) supplies 5 volts to the EGR temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the EGR flow temperature.
The EGR temperature value is used by the ECM for the engine protection system and engine emissions control.
Component Location
The EGR temperature sensor is located on the EGR connection tube between the EGR cooler and the air intake connection. 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.
Conditions for Setting the Fault Codes
The ECM detects that the EGR temperature signal voltage is less than 0.09-VDC for more than 1 second.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
- A default value for the EGR temperature reading is used.
- EGR valve actuation will be disabled.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
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.
The EGR temperature sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be active.
Possible causes of this fault code include:
- A signal shorted to ground in the harness
- A signal shorted to return or ground in the sensor.
Refer to Troubleshooting Fault Code t05-2376
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