DISC-FRICTION 3P0340 - Caterpillar

System Operation Description:This procedure covers the following diagnostic trouble codes:
Table 1
Diagnostic Trouble Codes for ARD Pilot Fuel Pressure High
J1939 Code Code Description Comments
3480-15 Aftertreatment #1 Fuel Pressure #1 : High - least severe There are Enhanced Troubleshooting Indicators for these codes.
3480-16 Aftertreatment #1 Fuel Pressure #1 : High - moderate severity
Table 2
Required Tools
Tools Required for Use with an 11/16 in Fitting
Part Number Description Qty
8T-8902 Tee 1
228-7089 O-Ring Seals 2
Tools Required for Use with a 9/16 in Fitting
Part Number Description Qty
7X-2444 Swivel Tee 1
214-7568 O-Ring Seals (Tee) 2
Tools Required for Use with Both Sizes of Fitting
Part Number Description Qty
6V-3965 Fitting 1
3J-1907 O-Ring Seals 2
8T-0855 Pressure Gauge 1
6V-4144 Quick Connect Coupler 1
Optional Tools
Part Number Description Qty
177-7860 Hose As 1
177-7861 Hose As 1
177-7862 Hose As 1
126-6872 9/16 inch Tee 1
8C-3309 11/16 inch Tee 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 g03017616
Measuring the current flow
(7) Pilot filter connector
(8) ARD combustion head
(9) Metal part of heater wire
(10) Insulated part of heater wire
Illustration 3 g03017658
ARD Fuel Manifold
(11) Pilot fuel control valveNote: After using the electronic service tool to clear a 3480-xx diagnostic trouble code, the keyswitch must also be cycled.Test Step 1. Check the Current Flow Through the Nozzle Heater
Verify that the engine is off.
Connect a suitable clamp-ammeter around the insulated part of the heater wire (10). Make sure that the jaws of the ammeter are away from the metal part of the heater wire (9).
Establish communication between the electronic service tool and the ECM. Refer to Troubleshooting, "Electronic Service Tools" for the proper procedure.
The ignition system may cause an electrical shock hazard, which may cause personal injury or death. Avoid contacting the ignition system components and the ignition system wiring during operation.
Start the engine. Activate the "ARD Nozzle Heater Test".
Record the current reading on the ammeter.
Disable the "ARD Nozzle Heater Test". Stop the engine. Remove the clamp-ammeter.
Disconnect the electronic service tool.Expected Result:The current flow is above 7.0 Amps for a 12 VDC system.The current flow is above 3.5 Amps for a 24 VDC system.Results:
The current flow is above the minimum amount for the appropriate system voltage. - The current flow is OK. Proceed to Test Step 2.
The current flow is below the expected amount for the appropriate system voltage . - The current flow is low.Repair: Determine the cause of the low current flow. Refer to Troubleshooting, "ARD Nozzle Heater - Test".STOPTest Step 2. 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 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 a 2 or 3. - Repair: Refer to Troubleshooting, "ARD Fuel Supply - Test" for troubleshooting information.STOP
The ETI code was not a 2 or 3. - Proceed to Test Step 3.Test Step 3.