0315777 JOHNSON THROTTLE CAM

Table 1
Diagnostic Trouble Codes for the Motorized Valves    
J1939 Code    Description    Notes    
2791-5     Engine Exhaust Gas Recirculation (EGR) Valve Control : Current Below Normal     The ECM detects the following conditions:
A low current condition 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.
If equipped, the warning lamp will come on. 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 (EGR valve) for 2 seconds
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
2791-7     Engine Exhaust Gas Recirculation (EGR) Valve Control : Not Responding 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.
This diagnostic code can be caused by a loss of the 5 VDC supply to the NRS valve position sensor.
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
3464-5     Engine Throttle Actuator 1 Control Command : Current Below Normal     The ECM detects the following conditions:
A low current condition in the output for the engine intake throttle valve for 2 seconds
168 diagnostic codes are not active.
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
3464-6     Engine Throttle Actuator 1 Control Command : Current Above Normal     The ECM detects the following conditions:
A high current condition in the output for the engine intake throttle valve for 2 seconds
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
3464-7     Engine Throttle Actuator 1 Control Command : Not Responding Properly     The ECM detects the following conditions:
The signal from the engine intake throttle valve position sensor indicates that the valve is not in the desired position.
This diagnostic code can be caused by a loss of the 5 VDC supply to the engine intake throttle valve position sensor.
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
3487-5     Afterreatment #1 Air Pressure Control : Current Below Normal     The ECM detects the following conditions:
A low current condition in the output for the combustion air valve for 2 seconds
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
3487-6     Aftertreatment #1 Air Pressure Control : Current Above Normal     The ECM detects the following conditions:
A high current condition in the output for the combustion air valve for 2 seconds
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
3487-7     Aftertreatment #1 Air Pressure Control : Not Responding Properly     The ECM detects the following conditions:
The signal from the combustion air valve position sensor indicates that the valve is not in the desired position.
This diagnostic code can be caused by a loss of the 5 VDC supply to the engine intake throttle valve position sensor.
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    The following background information is related to this procedure:
ARD combustion air valveThe Aftertreatment Regeneration Device (ARD) increases the exhaust gas temperature in order to burn off the soot that is collected in the DPF. The ARD requires a supply of fuel and clean air. The air supply is regulated by the ARD combustion air valve.The amount of air that is required by the ARD is calculated by the software that is contained in the ECM. The combustion air valve is controlled by a PWM signal from the ECM.NRS valve (EGR valve) and engine intake throttle valveThe 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.When necessary, the engine intake throttle valve reduces the intake manifold pressure so that the pressure in the NRS mixer is always higher. This pressure differential ensures that recirculated exhaust gases will flow into the intake manifold.The NRS valve and the engine intake throttle valve are controlled by a PWM signal from the ECM.Air System Motor Valves Verification TestThe Air System Motor Valve Verification Test will identify whether the EGR valve, and the EBPR are working correctly. This test must be run when the engine speed is zero and the battery voltage is within an acceptable range. For a 12VDC system, the service test must only be executed if the battery voltage is between 9VDC and 16VDC. For a 24VDC system, the battery voltage must be between 18VDC and 32VDC. If the battery voltage is outside of these ranges at any time, the test must be aborted. The test will also be aborted if a position sensor diagnostic, a motor short diagnostic, or a motor open circuit diagnostic become active.If at any point during the test the engine speed is not zero, the test will abort. The test moves the valves to various positions and then checks the position sensor within each valve to confirm that the valve has responded correctly. Each valve will be tested in turn, starting with the EGR valve. If a test threshold is exceeded or any related diagnostics become active, the test will abort and generate an error identifier.
Illustration 1 g02364276
Schematic for