0330985 JOHNSON THROTTLE CAM

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 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 Caterpillar 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.
Determine if an associated code is active or logged. Table 2 lists associated diagnostic codes.
   
Associated codes    
Result: There are associated codes.
Refer to Troubleshooting, "Event Codes" in order to troubleshoot the associated diagnostic code.
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, E1090, 2659-17 and/or 3358-16.
Proceed to Test Step 3.
   
Illustration 1 g01988573
Inspection points for the left side of the engine (1) NRS inlet valve (2) NRS temperature sensor (3) NRS outlet valve
Illustration 2 g01988633
Inspection points for the right side of the engine (4) NRS cooler outlet (5) NRS cooler inlet (6) NRS bellows joint
Table 4
Troubleshooting Test Steps    Values    Results    
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 the leaks.
Reset all active codes. Use Cat ET to perform an "EGR System Test" in order to verify that the problem is resolved.
Result: Leaks were not found in the system.
Proceed to Test Step 3.
   
3. Use Cat ET to Perform an "EGR System Test"
A. Clear "Active" codes using Cat ET.
B. Start the engine.
C. Use Cat ET to perform an "EGR System Test".
   
Test failed
   
Result: The "EGR System Test" fails due to "Delivered Fuel Volume Not Responding".
When the NRS gas flow is being commanded to change, no change in fuel delivery was measured. Increasing or decreasing the NRS gas flow will impact the amount of fuel needed to maintain the desired engine speed.
Proceed to Test Step 4.
Result: The "EGR System Test" fails due to "EGR Delta Pressure Not Responding".
The fault indicates that when the NRS valve moves from open to closed, no change in NRS delta pressure is measured.
Proceed to Test Step 5.
Result: The "EGR System Test" fails due to "EGR Absolute Pressure Not Responding".
The fault indicates that when the NRS valve moves from open to closed, no change in the NRS absolute pressure is measured.
Proceed to Test Step 6.
Result: The "EGR System Test" fails due to "EGR Mass Flow Rate Incorrect".
The fault indicates when the NRS valve moves from open to closed, the desired NRS mass flow is different from the actual mass flow rate.
Proceed to Test Step 4.