39695 Mercruiser "O" RING, REAR COVER

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 (E946 (2)) code is active or recently logged.
Proceed to Test Step 2.
Result: A 4360-17 (E947 (1)), or 4360-18 (E947 (2)) code is active or recently logged.
Proceed to Test Step 3.
Result: An associated code other than listed in Table 1 is active or recently logged.
Repair: Troubleshoot the logged or active code. Refer to Troubleshooting, "Diagnostic Trouble Codes".
Result: No codes are active or recently logged.
For engines that have a DPF, proceed to Test Step 4.
For engines that do not have a DPF, proceed to Test Step 5.
2. Check for Cause of High Temperature
A. Check for evidence of an exothermic event in the DOC and DPF (if applicable).
B. Check for evidence of excessive fuel reaching the DOC or DPF (if applicable)
High temperature
Result: There has been an exothermic event in the DOC or DPF.
Repair: Replace the Clean Emissions Module (CEM).
Result: There is evidence of excessive fuel reaching the DOC or DPF.
Repair: Investigate the cause of the excess fuel.
Result: There is no evidence of an exothermic event or fuel in the aftertreatment module.
Repair:
Perform the "Aftertreatment Recovery Procedure". Monitor the SCR inlet temperature.
If the SCR inlet temperature is abnormal, install a replacement SCR temperature sensor. Refer to Disassembly and Assembly, Temperature Sensor (Exhaust) - Remove and Install (Selective Catalytic Reduction (SCR) Temperature Sensor).
3. 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 (if equipped)
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 that 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.
Repair: Make the necessary repairs.
For engines that have a DPF, proceed to Test Step 4.
For engines that do not have a DPF, proceed to Test Step 5.
Result: The exhaust system insulation is damaged or missing.
Repair: Make the necessary repairs.
For engines that have a DPF, proceed to Test Step 4.
For engines that do not have a DPF, proceed to Test Step 5.
Result: Review and correct the routing of the exhaust system. If necessary, consult the Dealer Solutions Network (DSN) for further advice.
For engines that have a DPF, proceed to Test Step 4.
For engines that do not have a DPF, proceed to Test Step 5.
Result: There is excessive cooling air flow over the CEM.
Repair: Reduce the cooling air flow. If necessary, consult the Dealer Solutions Network (DSN) for further advice.
For engines that have a DPF, proceed to Test Step 4.
For engines that do not have a DPF, proceed to Test Step 5.
4. Check the SCR Catalyst Temperature
Note: This test step is only applicable to engines that have a DPF.
A. Connect to the electronic service tool.
B. Run the engine.
C. Perform the "Manual Hydrocarbon Dosing Capability Test".
Manual hydrocarbon dosing capability test
Result: The "Manual Hydrocarbon Dosing Capability Test" completed successfully.
Return the unit to service.
Result: The "Manual Hydrocarbon Dosing Capability Test" failed. An error identifier is generated by the electronic service tool.
Repair: Troubleshoot the error identifier. Refer to Troubleshooting, "Service tool Error Identifiers". Repeat Test Step 3.
Result: The "Manual Hydrocarbon Dosing Capability Test" failed. No error identifiers are generated.
Contact the Dealer Solutions Network (DSN).
5. Check the SCR Catalyst Temperature
Note: This test step is only applicable to engines that do not have a DPF.
A. Connect to the electronic service tool.
B. Run the engine.
C. Perform the "Aftertreatment Recovery Procedure".
Aftertreatment recovery procedure
Result: The "Aftertreatment Recovery Procedure" completed successfully.
Return the unit to service.
Result: The "Aftertreatment Recovery Procedure" failed. A diagnostic code is generated by the electronic service tool.
Repair: Troubleshoot the diagnostic code. Refer to Troubleshooting, "Service tool Error Identifiers". Repeat Test Step 3.
Result: The "Aftertreatment Recovery Procedure" failed. No diagnostic codes are generated.
Contact the Dealer Solutions Network.