GEAR-TRANSFER 3P0341 - Caterpillar

System Operation Description:This procedure covers the following diagnostic trouble codes:
Table 1
Diagnostic Trouble Codes for ARD Pilot Fuel Pressure Is Low
J1939 Code Code Description Comments
3480-17 Aftertreatment #1 Fuel Pressure #1 : Low - least severe There are Enhanced Troubleshooting Indicators for these codes.
3480-18 Aftertreatment #1 Fuel Pressure #1 : Low - moderate severity
Table 2
Required Tools
Part Number Description Qty
7X-0871 Swivel Tee 1
6V-3965 Fitting 1
3J-1907 O-Ring Seals 2
8T-0855 Pressure Gauge 1
6V-4144 Quick Connect Coupler 1
Illustration 1 g01985893
Aftertreatment Regeneration Device (ARD) Fuel Pump
(1) Electrical connector
(2) Fuel outlet
(3) Fuel return to tank
(4) Fuel inlet
(5) Fuel inlet (alternative)
(6) Fuel inlet (alternative)
Illustration 2 g02231693
ARD Fuel Manifold
(7) ARD pilot fuel control valve
(8) ARD fuel manifold filterNote: After using the electronic service tool to clear a 3480-xx diagnostic trouble code, the keyswitch must also be cycled.Test Step 1. Find the Enhanced Troubleshooting Indicator (ETI)
Establish communication between the electronic service tool and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Download the following items before performing any troubleshooting or clearing any diagnostic codes:
Warranty Report
Aftertreatment Regeneration Trigger History
Product Status Report with Histograms
Record the ETI code.Results:
The ETI code was not a 2 or 3. - Proceed to Test Step 2.
The ETI code was a 2 or 3. - Proceed to Test Step 3.Test Step 2. Check for External LeaksCheck for external leaks. Inspect the fuel lines from the pump to the ARD fuel manifold. Check for pinched lines or leaking lines.Results:
A leak or pinched line was found. - Repair: Repair all damaged lines or leaking lines. Use the electronic service tool to perform the "ARD Ignition Test".If the "ARD ignition test" was successful, return to service. If the "ARD ignition test" was not successful, proceed to Test Step 3.
A leak or pinched line was not found. - Proceed to Test Step 3.Test Step 3. Check the Low-Pressure Fuel System
If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).
Check for fuel supply lines that are restricted.
Check that the low-pressure fuel lines are correctly installed.
Replace the in-line fuel strainer that is installed upstream of the Electric Fuel Lift Pump (EFLP).
Check that the EFLP is operating. If the EFLP is suspect, refer to Troubleshooting, "Fuel Pump Relay Circuit - Test".
Check the diesel fuel for contamination. Refer to Systems Operation, Testing, and Adjusting, "Fuel Quality - Test".
Check for air in the fuel system. Refer to Systems Operation, Testing, and Adjusting, "Air in Fuel - Test".
Ensure that the fuel system has been primed. Refer to Systems Operation, Testing, and Adjusting, "Fuel System - Prime".
Replace the primary fuel filter. Refer to the Operation and Maintenance Manual, "Fuel System Primary Filter (Water Separator) Element - Replace".
Start the engine and attempt to perform a manual DPF regeneration.Results:
A fault was identified and corrected in the low-pressure fuel system. - Make sure that all diagnostic trouble codes have been cleared.STOP
A 3480-xx code is still present. - Proceed to Test Step 4.Test Step 4. Check the ARD Fuel Pump
Turn the keyswitch to the "OFF" position.
Disconnect the connector for the ARD fuel pump.
Start