48025 Mercruiser LEAD, PRIMARY

Table 1
J1939 Code and Description CDL Code and Description Comments
4334–7
Aftertreatment #1 DEF #1 Pressure (absolute) : Not Responding Properly 3090–7
Aftertreatment #1 DEF Pressure Sensor : Not Responding Properly The DEF system pressure is not stable during dosing on aftertreatment #1 pump #1.
4334-17
Aftertreatment #1 DEF #1 Pressure (absolute) : Low - least severe (1) E931 (1)
Low Aftertreatment #1 DEF Pressure #1 The Diesel Exhaust Fluid (DEF) system pressure dropped below the acceptable threshold during dosing on aftertreatment #1 pump #1.
4387–7
Aftertreatment #2 DEF #1 Pressure (absolute) : Not Responding Properly 3091–7
Aftertreatment #2 DEF #1 Pressure (absolute) : Not Responding Properly The DEF system pressure is not stable during dosing on aftertreatment #2 pump #1.
4387-17
Aftertreatment #2 DEF #1 Pressure (absolute) : Low - moderate severity (2) E933 (1)
Aftertreatment #2 DEF #1 Pressure (absolute) : Low - moderate severity (2) The DEF system pressure dropped below the acceptable threshold during dosing on aftertreatment #2 pump #1.
5392-31
Aftertreatment #1 DEF Dosing Unit #1 Loss of Prime E1370 (1)
Aftertreatment #1 DEF Dosing Unit #1 Loss of Prime The DEF system pressure was not achieved during priming on aftertreatment #1 pump #1.
5748-31
Aftertreatment #2 DEF Dosing Unit #1 Loss of Prime E1371 (1)
Aftertreatment #2 DEF Dosing Unit #1 Loss of Prime The DEF system pressure was not achieved during priming on aftertreatment #2 pump #1.
7459–7
Aftertreatment #1 DEF Doser #2 Absolute Pressure : Not Responding Properly 5006–7
Aftertreatment #1 Diesel Exhaust Fluid Pressure #2 Sensor : Not Responding The DEF system pressure is not stable during dosing on aftertreatment #1 pump #2.
7459-17
Aftertreatment #1 DEF Doser #2 Absolute Pressure : Low - least severe (1) E1706 (1)
Low Aftertreatment #1 DEF Pressure #2 The DEF system pressure dropped below the acceptable threshold during dosing on aftertreatment #1 pump #2.
7464–7
Aftertreatment #2 DEF Doser #2 Absolute Pressure : Not Responding Properly 5007–7
Aftertreatment #2 DEF Doser #2 Absolute Pressure : Not Responding Properly The DEF system pressure is not stable during dosing on aftertreatment #2 pump #2.
7464-17
Aftertreatment #2 DEF Doser #2 Absolute Pressure : Low - least severe (1) E1708 (1)
Low Aftertreatment #2 DEF Pressure #2 The DEF system pressure dropped below the acceptable threshold during dosing on aftertreatment #2 pump #2.
7541-31
Aftertreatment #1 DEF Dosing Unit #2 Loss of Prime E1666 (1)
Aftertreatment #1 DEF Dosing Unit #2 Loss of Prime The DEF system pressure was not achieved during priming on aftertreatment #1 pump #2.
7542-31
Aftertreatment #2 DEF Dosing Unit #2 Loss of Prime E1667 (1)
Aftertreatment #2 DEF Dosing Unit #2 Loss of Prime The DEF system pressure was not achieved during priming on aftertreatment #2 pump #2.
Table 2
Associated Codes
J1939 Code CDL Code Troubleshooting Procedure
1761-1 E954 (3) Troubleshooting, "DEF Tank Level Is Low"
1761-17 E954 (1) Troubleshooting, "DEF Tank Level Is Low"
1761-18 E954 (2) Troubleshooting, "DEF Tank Level Is Low"
7598-5 5024-5 Troubleshooting, "Solenoid Valve - Test (Aftertreatment)"
7598-6 5024-6 Troubleshooting, "Solenoid Valve - Test (Aftertreatment)"
7599-5 5025-5 Troubleshooting, "Solenoid Valve - Test (Aftertreatment)"
7599-6 5025-6 Troubleshooting, "Solenoid Valve - Test (Aftertreatment)"
7600-5 5026-5 Troubleshooting, "Solenoid Valve - Test (Aftertreatment)"
7600-6 5026-6 Troubleshooting, "Solenoid Valve - Test (Aftertreatment)"
7601-5 5027-5 Troubleshooting, "Solenoid Valve - Test (Aftertreatment)"
7601-6 5027-6 Troubleshooting, "Solenoid Valve - Test (Aftertreatment)"
Table 3
Required Tools Qty
441-0451 Tool Gp 1 Probable Causes
Codes
DEF filters
Connectors and Wiring
Leaks
DEF quality
DEF lines
Voltage
DEF pump
Backflow valve
Plugged DEF injectorsRecommended Actions
Reference: Refer to Troubleshooting, System Overview (Aftertreatment Identification) for locating aftertreatment components if necessary.
Table 4
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot the associated code before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Inspect the DEF Tank Vent Line, Breather, and Fill Cap for Debris
Debris
Results: The vent line, breather, and DEF tank fill showed no signs of debris accumulation.
Proceed to Test Step 3.
Results: The components show signs of debris accumulation.
Repair: Remove and clean the contaminated components with warm water. Reinstall the components.
Proceed to Test Step 3.
3. Inspect the Electrical Connectors and the Wiring
A. Turn the keyswitch to OFF.
B. Inspect the electrical connections to each DEF tank header. Refer to Troubleshooting, "Electrical Connectors - Inspect" for additional information.
C. Inspect the connections for corrosion or loose wires.
Connectors and Wiring
Result: The connectors and wiring appear to be OK.
Proceed to Test Step 4.
Result: There is a problem with the connectors and/or wiring.
Repair: Repair or replace the connectors or wiring. Ensure that all the seals are properly in place and ensure that the connectors are coupled.
Proceed to Test Step 11.
4. Inspect the DEF Lines for Leaks
A. Turn the keyswitch to ON. Do not start the eng