FAULT CODE 2375
Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
Overview
| CODE | REASON | EFFECT |
| Fault Code: 2375 PID: P412 SPN: 412 FMI: 3/3 LAMP: Amber SRT: |
High signal voltage detected at EGR temperature circuit.
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Possible reduced engine performance.
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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 engine 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.
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 Engine Control Module (ECM) detected the EGR temperature signal voltage was greater than 4.9-VDC for more than 8 seconds.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
A default value for the exhaust gas recirculation temperature reading is used.
- Diesel exhaust fluid injection into the aftertreatment system is disabled.
Active and stationary regeneration of the diesel particulate filter will be disabled.
Exhaust gas recirculation (EGR) valve operation will be disabled.
Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Conditions for Clearing the Fault Code
- To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
- The fault code status displayed by INSITE electronic service tool will change to inactive immediately after the diagnostic runs and passes.
- The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
- For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
- The Reset All Faults command in INSITE electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications
Shop Talk
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:
An open return circuit in the harness, connectors, or sensor
An open signal circuit or shorted to a voltage source.
Troubleshooting Summary
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the EGR temperature sensor from the engine wiring harness.
Action
- Inspect the pins and connectors for damage.
- Place a jumper wire between the EGR temperature sensor SIGNAL pin and the EGR temperature sensor RETURN pin at the sensor connector of the engine wiring harness.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
- Wait 30 seconds before checking the circuit response.
- Use the recommended Cummins electronic service tool or equivalent to read the fault codes.
Specification
- A malfunctioning EGR temperature sensor has been detected if the following fault code became active with the jumper wire in place: 2376
Linked Solutions
- None
Repair
- Replace EGR temperature sensor.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the engine wiring harness connector from the ECM.
Action
- Inspect the pins and connectors for damage.
- Place a jumper wire between the EGR temperature sensor SIGNAL pin and the EGR temperature sensor RETURN pin at the ECM.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
- Wait 30 seconds before checking the circuit response.
- Use the recommended Cummins electronic service tool or equivalent to read the fault codes.
Specification
- A malfunctioning ECM has been detected if the following fault code does not become active with the jumper wire in place: 2376
- A malfunctioning engine wiring harness has been detected if the following fault code became active with the jumper wire in place: 2376
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- Replace the ECM.
- Repair or replace the engine wiring harness.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Verification
Conditions
- Connect all components.
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
Action
- Use the recommended Cummins electronic service tool or equivalent to read the fault codes.
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revision listed in the ECM calibration revision history for applicable changes.
Specification
- If a calibration update for this fault code is available, the ECM calibration revision must be that revision or higher.
Linked Solutions
- None
Repair
- Prior to downloading the ECM calibration, check to see that all job images and all other troubleshooting has been documented as downloading an ECM calibration will remove the fault codes on the ECM.
- Download the updated ECM calibration code.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
If all steps have been completed and no root cause has been identified, then follow the technical escalation process.