TUBE AS 5124645 - Caterpillar

Table 1
Diagnostic Trouble Codes for the NOx Sensors
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
3216-7 E1431 (2) Aftertreatment #1 Intake NOx : Not Responding Properly The engine out NOx level is not responding as expected.
The code is logged.
3226-7 E1432 (2) Aftertreatment #1 Outlet NOx : Not Responding Properly The tailpipe out NOx level is not responding as expected.
The code is logged.
4364-2 E1410 (2) Aftertreatment #1 SCR Catalyst Conversion Efficiency : Erratic, Intermittent, or Incorrect The Engine Out and Tailpipe Out NOx Sensors are installed in the incorrect locations
Follow the troubleshooting procedure to identify the root cause of the problem. Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Determine the Diagnostic Code
A. Establish communication between the electronic service tool and the engine Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Determine the diagnostic trouble code that is active.
Diagnostic trouble code
Result: A 4364-2 (E1410 (2)) diagnostic code is active or recently logged.
Proceed to Test Step 2.
Result: A 3216-7 (E1431 (2)) or 3226-7 (E1432 (2)) diagnostic code is active or recently logged.
Proceed to Test Step 3.
2. Check that the NOx Sensors are Installed Correctly
A. Verify that the sensors are located in the correct position.
The engine out NOx sensor has black protective coating on the wires.
The tailpipe out NOx sensor has gray protective coating on the wires.
B. If the sensors are installed in the wrong positions, install the sensors in the correct positions. Refer to Disassembly and Assembly, "Nitrogen Oxide Sensor - Remove and Install" for the correct procedure.
Correct installation
Result: The NOx sensors are already in the correct locations.
Proceed to Test Step 3.
Result: The NOx sensors have been swapped.
Proceed to Test Step 8.
3. Perform an "Aftertreatment System Functional Test"
A. Establish communication between the electronic service tool and the engine ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Perform an "Aftertreatment System Functional Test" using the electronic service tool.
Successful completion of test
Result: The test completed successfully.
Return the unit to service.
Result: The test did not complete successfully.
Proceed to Test Step 4.
4. Check for an Engine Misfire
A. Establish communication between the electronic service tool and the engine ECM.
B. Perform a "Cylinder Cutout Test" using the electronic service tool.
Misfire
Result: A misfire was detected.
Repair: Replace or repair the failed component or components.
Proceed to Test Step 6.
Result: A misfire was not detected.
Proceed to Test Step 5.
5. Check the Exhaust System for Leaks
A. Check the entire exhaust system for leaks.
Exhaust leaks
Result: There were not any exhaust leaks found.
Repair: For a 3216-7 (E1431 (2)) diagnostic code replace the intake NOx sensor.
For a 3226-7 (E1432 (2)) diagnostic code replace the outlet NOx sensor.
Refer to Disassembly and Assembly, "Nitrogen Oxide Sensor - Remove and Install" for the correct procedure.
Proceed to Test Step 6.
Result: There were exhaust leaks found.
Repair: Repair the exhaust leaks.
Proceed to Test Step 8.
6. Check the Aftertreatment System for Oil or Fuel
A. Remove excess oil or fuel from the piping with a clean cloth.
B. Remove the Clean Emissions Module (CEM). Refer to Disassembly