CAGE 5M7368 - Caterpillar

System Operation Description:The exhaust gas that flows from the exhaust manifold is mixed with fresh air. The NRS meters the mixture of air and exhaust. The NRS also cools the mixture. This mixture will reduce the NOx emissions of the engine.The following NRS consists of the following components:
NRS cooler
NRS venturi
NRS absolute pressure sensor
NRS differential pressure sensor
NRS temperature sensor
NRS valveThe following diagnostic trouble codes aid in detection of pressure and air flow issues within the NRS.Note: Some of the following codes may not be applicable for certain applications.
Table 1
Diagnostic Trouble Codes
CDL Code J1939 Code Code Description
(code descriptions may vary) Comments
E1090 (2) 3358-16 High EGR Intake Pressure The ECM detects a higher than desired EGR Intake Pressure
E1095 (1) 2659-17 Low EGR Mass Flow Rate The Electronic Control Module (ECM) detects a lower than desired flow rate through the NRS
E1096 (1) 2659-15 High EGR Mass Flow Rate The ECM detects a higher than desired flow rate through the NRS
E1093 (1) 411-17 Low EGR Differential Pressure The ECM detects an abnormally low reading from the NRS differential pressure sensor.
E1094 (1) 411-15 High EGR Differential Pressure The ECM detects an abnormally high reading from the NRS differential pressure sensor. 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.
Table 2
Associated Diagnostic Trouble Codes
E1154
E1123
E1092
3609-17
3609-18
5276-7
412-15
412-16
Table 3
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Trouble Codes
A. Establish communication between Cat&r