SPN 412 - FMI 3 (Fault Code 2375)
SPN412 FMI3
Exhaust Gas Recirculation Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source
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| ISB, ISC, and ISL - Exhaust Gas Recirculation Temperature Sensor Circuit |
Fault Code: 2375
PID(P), SID(S): P412
SPN: 412
FMI: 3/3
Lamp: Amber
REASON: Exhaust Gas Recirculation Temperature Sensor Circuit - Voltage Above Normal or Shorted
to High Source. High signal voltage detected at EGR temperature circuit.
EFFECT: EGR valve actuation will be disabled.
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 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.
Conditions for Setting the Fault Codes:
The ECM detects that the EGR temperature signal voltage is greater than 5.1-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 exhaust gas recirculation temperature reading is used.
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 ECM calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM.
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.
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