PACCAR PX-9 CM2350 (2013-17) Fault Code:2961 PID:412 SPN:412 FMI:15 Exhaust Gas Recirculation Temperature – Data Valid But Above Normal Operational Range – Least Severe Level

Reason:
Exhaust Gas Recirculation Temperature – Data Valid But Above Normal Operational Range – Least Severe Level. EGR temperature has exceeded the engine protection limit

Effect:
Possible reduced engine performance.

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 was greater than 210°C [410°F] for more than 5 seconds.

Action Taken When the Fault Code is Active:
1) The ECM logs the fault code immediately when the diagnostic runs and fails.
2) Engine torque will be reduced.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) 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:
Note: This fault code will most likely not be active with no load in the shop. The engine must be loaded to trigger this fault code.

Possible Causes:
1) Plugged or restricted EGR differential pressure sensor ports
2) Damaged EGR differential pressure tubes
3) A malfunctioning EGR valve
4) A low reading from the EGR differential pressure sensor
5) A low reading for the EGR valve position sensor
6) High exhaust temperatures
7) Low coolant level
8) High coolant temperature
9) An incorrect coolant/water mixture
10) A stuck closed variable geometry turbocharger
11) A fouled EGR cooler