HANDLE AS 4654034 - Caterpillar

Table 1
Diagnostic Trouble Code for NRS Mass Flow Rate Problem    
J1939 Code    Code Description    Comments    
2659-7     Engine Exhaust Gas Recirculation (EGR) Mass Flow Rate : Not Responding Properly     Actual mass flow through the NOx Reduction System (NRS) does not match the desired mass flow.
The Electronic Control Module (ECM) has been powered for at least 2 seconds.
The engine is running.
There are no active codes for the 5 VDC supply.
There are no active 27, 157, 1188, 2791, 3358 or 3563 codes.
412-3 or 412-4 codes are not active.    
Illustration 1 g02752516
NRS system (1) NRS inlet pressure sensor (2) NRS outlet pressure sensor (3) NRS outlet pressure sensor pipe (4) NRS inlet pressure sensor pipe (5) NRS mixer (6) NRS temperature sensorTest Step 1. Check for Associated Diagnostic Trouble Codes
Establish communication between the electronic service tool and the ECM. If necessary, refer to Troubleshooting, "Electronic Service Tools".
Check for diagnostic trouble codes that are associated with the NRS valve or the exhaust back pressure regulator.Results:
There are diagnostic trouble codes that are associated with the NRS valve or the exhaust back pressure regulator. - Repair: Troubleshoot NRS valve faults or exhaust back pressure regulator faults before continuing with this procedure. Refer to Troubleshooting, "Diagnostic Trouble Codes".STOP
There are no associated codes. - Proceed to Test Step 2.Test Step 2. Check the Air Inlet and Exhaust System
Check the air inlet system for leaks and for restrictions.
Check the exhaust system for leaks and for restrictions.Results:
There are no leaks in the air inlet system or the exhaust system. - Proceed to 3.
The air inlet system has a leak or is restricted. - Repair: Perform the following procedure:
Clear any restrictions in the air inlet system.
Repair any air leaks in the air inlet system.
Check that the fault has been eliminated. If the fault is still present, proceed to 3.
The exhaust system has a leak or is restricted. - Repair: Perform the following procedure:
Clear any restrictions in the exhaust system.
Repair any leaks in the exhaust system.
Check that the fault has been eliminated. If the fault is still present, proceed to Test Step 3.Test Step 3. Check the NRS Sensor PipesRefer to Illustration 1.
Check pipe (3) for the NRS outlet pressure sensor for leaks, restrictions, or blockage.
Check pipe (4) for the NRS inlet pressure sensor for leaks or any restriction.Results:
There are no leaks, restrictions, or blockages in the sensor pipes. - Proceed to Test Step 4.
There is a leak, a restriction, or a blockage in one of the sensor pipes. - Repair: Perform the following repair:
If a pipe has a leak or a restriction, replace the pipe.
If the pipe is blocked with soot or condensate, remove the pipe and clear the blockage with an air line that is set at a maximum pressure of 200 kPa (29 psi). If the blockage is cleared, install the pipe. If the blockage cannot be cleared, replace the pipe.
Check that the fault has been eliminated. If the fault is still present, proceed to Test Step 4.Test Step 4. Check the