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Table 1
J1939 Code and Description CDL Code and Description Comments
411-15
High EGR Differential Pressure E1094 (1)
High EGR Differential Pressure The ECM detects an abnormally high reading from the NRS differential pressure sensor.
411-17
Low EGR Differential Pressure E1093 (1)
Low EGR Differential Pressure The ECM detects an abnormally low reading from the NRS differential pressure sensor.
2659-15
High EGR Mass Flow Rate E1096 (1)
High EGR Mass Flow Rate The ECM detects a higher than desired flow rate through the NRS
2659-17
Low EGR Mass Flow Rate E1095 (1)
Low EGR Mass Flow Rate The Electronic Control Module (ECM) detects a lower than desired flow rate through the NRS Note: EGR is an industry standard term used to describe the recirculation of exhaust gas through the engine as a means to reduce "NOx" emissions. Caterpillar has elected to refer to this system as the "NOx Reduction System" (NRS). Diagnostic codes are regulated by SAE, therefore, the diagnostic codes still reflect the EGR nomenclature.Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Trouble Codes
A. Establish communication between Cat® Electronic Technician (ET) and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Troubleshoot any active or logged diagnostic trouble codes before troubleshooting the event codes outlined in this procedure.
Codes
Result: There are no associated codes. If the original diagnostic trouble code was a E1095, E1096, 2659-15 and/or a 2659-17.
Proceed to Test Step 2.
Result: There are no associated codes. If the original diagnostic trouble code was a E1093, E1094, 411-17 and/or 411-15.
Proceed to Test Step 5.
Result: There are no associated codes. If the original diagnostic trouble code was a E1095 or 2659-17.
Proceed to Test Step 3.
2. Inspect the NRS for Leakage
A. Inspect the following components of the NRS for leakage:
1. Exhaust manifold
2. Connections for NRS cooler inlet and NRS cooler outlet
3. NRS venturi inlet and outlet connections
4. Port locations for NRS differential pressure sensor and NRS absolute pressure sensor
5. Connections for NRS inlet valve and NRS outlet valve
Common signs of a leak in the NRS are loose connections, damaged lines, or components and exhaust soot buildup around the area that is leaking.
Leakage
Result: Leaks were found in the system.
Repair: Repair the leaks.
Reset all active codes and clear all logged codes. Use Cat ET to perform an "EGR System Test" to verify