GASKET 4N3933 - Caterpillar

This procedure covers the following codes:
Table 1
Diagnostic Codes for the Motorized Valves
J1939 Code Code Description Comments
2791 -3 Engine Exhaust Gas Recirculation (EGR) Valve Control : Voltage Above Normal The ECM detects the following conditions:
A high-voltage condition exists in the output for the NOx Reduction System (NRS) valve (EGR valve) for 2 seconds
168 diagnostic codes are not active.
The ECM has been powered for at least 2 seconds.
The warning lamp will come on. The ECM will log the diagnostic code.
2791-10 Engine Exhaust Gas Recirculation (EGR) Valve Control : Abnormal Rate of Change The ECM detects the following conditions:
The NRS valve (EGR valve) is not responding as expected.
The ECM has been powered for at least 2 seconds.
The warning lamp will come on. The ECM will log the diagnostic code.
2950-2 Engine Intake Valve Actuator #1 : Erratic, Intermittent, or Incorrect
(If equipped) The ECM detects the following conditions:
The signal to the intake throttle valve is not as expected.
The ECM has been powered for at least 2 seconds.
The warning lamp will come on. The ECM will log the diagnostic code.
2950-7 Engine Intake Valve Actuator #1 : Not Responding Properly
(If equipped) The ECM detects the following conditions:
The position of the intake throttle valve is not as expected.
The ECM has been powered for at least 2 seconds.
The warning lamp will come on. The ECM will log the diagnostic code. The following background information is related to this procedure:NRS valve (EGR valve)The NRS valve (EGR 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.EGR Valve Control Override TestThe EGR Valve Control Override