ENGINE AR-PRIM 3567134 - Caterpillar

Table 1
Diagnostic Trouble Code for SCR Catalyst Has Incorrect Inlet Temperature    
J1939 Code    Description    Notes    
4360-16     Aftertreatment #1 SCR Catalyst Intake Gas Temperature : High - moderate severity (2)     The aftertreatment SCR catalyst intake gas temperature sensor has detected that the SCR intake temperature is above the normal operating range.    
4360-17     Aftertreatment #1 SCR Catalyst Intake Gas Temperature : Low - least severe (1)     ECM detects that the SCR catalyst intake temperature is below the acceptable range.
The code is logged.    
4360-18     Aftertreatment #1 SCR Catalyst Intake Gas Temperature : Low - moderate severity (2)     The aftertreatment SCR catalyst intake gas temperature sensor has detected that the SCR intake temperature is far below the normal operating range.    
Follow the troubleshooting procedure in order to identify the root cause of the fault.    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. Turn the keyswitch to the ON position. Do not start the engine.
B. Connect to the electronic service tool.
C. Check for associated diagnostic trouble codes.
   
Diagnostic trouble codes
   
Result: A 4360-16, 4360-17, or 4360-18 code is active or recently logged.
Proceed to Test Step 2.
Result: An associated code other than 4360-16, 4360-17, or 4360-18 is active or recently logged.
Troubleshoot the logged or active code. Refer to Troubleshooting, "Diagnostic Trouble Codes".
Result: No codes are active or recently logged.
Proceed to Test Step 3.
   
2. Check the Exhaust System
A. Check the exhaust system for gas leaks between the Exhaust Back Pressure Regulator (EBPR) and the exhaust tail pipe.
B. Check for gas leaks around the following items in the Clean Emissions Module (CEM):
Soot antennas
Temperature sensors
SCR inlet NOx sensor
DEF injector
C. Check for signs of internal exhaust gas leaks on the outer casing of the CEM.
D. Check for missing or damaged exhaust system insulation.
E. Make sure that the exhaust piping between the EBPR and the CEM is no longer than
1.83 m (6 ft).
F. Make sure the cooling air flow over the CEM is not excessive for the ambient conditions.
   
Exhaust System
   
Result: The exhaust system or the CEM has a gas leak.
Make the necessary repairs.
Proceed to Test Step 3.
Result: The exhaust system insulation is damaged or missing.
Make the necessary repairs.
Proceed to Test Step 3.
Result: Review and correct the routing of the exhaust system. If necessary, consult the Technical Communicator at a Cat dealer for further advice.
Proceed to Test Step 3.
Result: There is excessive cooling air flow over the CEM.
Reduce the cooling air flow. If necessary, consult the Technical Communicator at a Cat dealer for further advice.
Proceed to Test Step 3.
   
3. Check the SCR Catalyst Temperature
A. Connect to the electronic service tool.
B. Run the engine.
C. Perform the "HC Dosing Capability Test".
   
Test
   
Result: The "HC Dosing Capability Test" completed successfully.
Return the unit to service.
Result: The "HC Dosing Capability Test" failed. An error identifier is generated by the electronic service tool.
Troubleshoot the error identifier. Refer to Troubleshooting,