Cummins ISX15 CM2250 (2010-12) Fault Code: 1867 PID: 412 SPN: 412 FMI: 2 Engine Gas Recircuilation Temperature- Data Erratic, Intermittent, Or Incorrect - EcuForce Truck (2024)

Circuit Description
The 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 consists of two parts. The first part runs when the keyswitch is turned to the ON position after a 10 hour cold soak, during which the keyswitch has been turned OFF. The second part runs continuously while the engine is operating and EGR flow is above a calibratible value.

Conditions for Setting the Fault Codes
The fault code is set active when an EGR temperature reading too high or too low for the operating conditions has been detected, or if the EGR temperature reading is not changing with the operating conditions.

Action Taken When the Fault Code is Active
The ECM illuminates the red STOP ENGINE light and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
Diesel exhaust fluid injection into the aftertreatment system is disabled.
Active and stationary regeneration of the diesel particulate filter will be disabled.
The EGR valve will be closed.
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 using a Diagnostic Road Test, utilize a route that incorporates both stop-and-go city driving and steady state highway driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer Test, utilize a routine that incorporates acceleration and motoring events, steady state highway operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
If the fault code does not go inactive after 10 minutes of driving, it may be necessary to perform a 10 hour cold soak with the key OFF, then turn the keyswitch to the ON position so that the key ON portion of the diagnostic will run.
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 after the diagnostic runs and passes.
For OBD engines, the ECM will turn off the 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
Possible causes of this fault code include:

Stuck in-range EGR temperature sensor
High resistance in the EGR temperature sensor SIGNAL or RETURN wires

Possible Cause:
1) ECM failure

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