
Table 81
Diagnostic Trouble Codes for the Motorized Valves
J1939
Code
Description
Notes
2791-5
Engine Exhaust Gas Recirculation
(EGR) Valve Control : Current Below
Normal
The Electronic Control Module (ECM) detects the following conditions:
A low current condition in the output for the NOx Reduction System (NRS) valve for at least 0.3
seconds.
The battery voltage is at least 10 VDC.
The engine will be derated. The ECM will log the diagnostic code.
2791-6
Engine Exhaust Gas Recirculation
(EGR) Valve Control : Current Above
Normal
The ECM detects the following conditions:
A high current condition in the output for the NRS valve for at least 0.3 seconds.
The battery voltage is at least 10 VDC.
The engine will be derated. The ECM will log the diagnostic code.
2791-7
Engine Exhaust Gas Recirculation
(EGR) Valve Control : Not Respond-
ing Properly
The ECM detects the following conditions:
The signal from the NRS valve position sensor indicates that the valve is not in the desired
position.
The difference between the desired position and the actual position is greater than 12 percent.
This diagnostic code can be caused by a loss of the 5 VDC supply to the NRS valve position
sensor.
The engine will be derated. The ECM will log the diagnostic code.
5419-5
Engine Throttle Actuator #1 : Current
Below Normal
The ECM detects the following conditions:
A low current condition in the output for the engine intake throttle valve for at least 0.5 seconds.
The ECM will log the diagnostic code.
5419-6
Engine Throttle Actuator #1 : Current
Above Normal
The ECM detects the following conditions:
A high current condition in the output for the engine intake throttle valve for at least 0.5
seconds.
The ECM will log the diagnostic code.
5419-7
Engine Throttle Actuator #1 : Not
Responding Properly
The ECM detects the following conditions:
The signal from the intake throttle valve position sensor indicates that the valve is not in the de-
sired position for at least 0.05 seconds.
The difference between the desired position and the actual position is greater than 12 percent.
This diagnostic code can be caused by a loss of the 5 VDC supply to the intake throttle valve
position sensor.
The engine will be derated. The ECM will log the diagnostic code.
The following background information is related
to this procedure:
NRS Valve
The NRS valve is used to control the amount of
exhaust gas which is recirculated into the intake
manifold.
The amount of exhaust gas that is required is
calculated by the software that is contained in the
ECM. The NRS valve is controlled by a PWM signal
from the ECM.
Intake Throttle Valve
The intake throttle valve is used to increase the
exhaust gas temperature to aid the Diesel Particulate
Filter (DPF) regeneration process.
UENR0612
159
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