C7.1 Engines and Generator Sets Caterpillar

ARD Fuel Pressure Is High

Usage:

C7.1 770

This procedure covers the following diagnostic trouble codes:

Note: Refer to Troubleshooting, "Service Tool Features" for information about service features.

Note: Some of the following codes may not be applicable for certain applications.

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Table 1
Diagnostic Trouble Codes
J1939 Code	CDL Code	Code Description	Comments
3480-15	E1050 (1)	High Aftertreatment #1 Fuel Pressure #1	There are Enhanced Troubleshooting Indicators for this code.
3480-16	E1050 (2)	High Aftertreatment #1 Fuel Pressure #1	There are not Enhanced Troubleshooting Indicators for this code.

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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

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Illustration 1	g06126615
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)

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Illustration 2	g06126617
ARD Combustion Head (7) ARD pilot filter connector

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Illustration 3	g06126629
ARD Fuel Manifold (8) Pilot fuel control valve

Note: After using the electronic service tool to clear a 3480-xx diagnostic trouble code, the keyswitch must also be cycled.

Complete the procedure in the order in which the steps are listed.

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Table 3
Troubleshooting Test Steps	Values	Results
1. Perform an ARD Ignition Test and Record the Enhanced Troubleshooting Indicator (ETI) A. Establish communication between the electronic service tool and the Electronic Control Module (ECM). Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Perform an ARD Ignition Test using the electronic service tool. Refer to System Operation and Testing and Adjusting, "ARD Fuel System - Test". C. The ETI code is located in the "Active Events" or "Logged Events" screen in the electronic service tool. Record the Enhanced Troubleshooting Indicator (ETI) code. ETI codes are not available for (2) codes.	ETI Code	Result : There is not an ETI for the diagnostic code. Proceed to Test Step 2. Result : The ETI code was recorded. Proceed to Test Step 2.

Note: The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, the Manual DPF Regeneration must be performed using the electronic service tool.

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Table 4
Troubleshooting Test Steps	Values	Results
2. Check the Current Flow to the Heating Element in the ARD Combustion Head A. Start the engine. Use a clamp-on ammeter to check the current flow to the heater.	Current Check	Result: The current flow is between 7.0 A and 14 A for a 12 V system. The current flow is between 3.5 A and 7 A for a 24 V system. The current flow is OK. Proceed to Test Step 3. Result: The current flow is not between 7.0 A and 14 A for a 12 V system. The current flow is not between 3.5 A and 7 A for a 24 V system. Repair : There may be a problem with the ARD nozzle. Refer to Troubleshooting, "ARD Nozzle Heater - Test". STOP.
3. Check the ARD Fuel Pump A. Turn the engine OFF. B. Disconnect the fuel outlet line (2) from the ARD fuel pump. Refer to Illustration 1. C. Install the required parts listed in Table 3 at the outlet port of the pump. D. Start the engine. E. Establish communications between the electronic service tool and the Engine ECM. F. Clear the active event code. G. Select "Aftertreatment Fuel Pump Relay Override" in the electronic service tool to activate the pump. H. Record the pressure from the pressure gauge. I. Deactivate the override. J. Turn the keyswitch to the OFF position.	Pressure check	Result: The pressure reading is not between 1780 kPa (258 psi) and 2020 kPa (292 psi). Repair : Replace the ARD fuel pump. Refer to Disassembly and Assembly, Fuel Pump (ARD) - Remove and Install. Result: The pressure reading is between 1780 kPa (258 psi) and 2020 kPa (292 psi). If a 3480-15 code with an ETI of 6 is present, proceed to Test Step 5. If a 3480-15 code with an ETI of 1 is present, proceed to Test Step 6. If a 3480-16 code is present, proceed to Test Step 6.
Note: This step may only apply to certain engines. If the engine being worked on does not contain the fittings with the filter inside, proceed to Test Step 5. Verify filter usage by checking the parts information in SPI2. 4. Replace the Fittings that Contain the Filter in the ARD Fuel Manifold A. Replace the fitting that contains the filters in the ARD Fuel Manifold. B. Reset all active codes and clear all logged codes by cycling the keyswitch to the OFF position. C. Perform the "ARD Ignition Test" using the electronic service tool. Refer to System Operation and Testing and Adjusting, "ARD Fuel System - Test".	Replace filter fittings	Result: The "ARD Ignition Test" was successful and no codes were logged. Return the unit to service. STOP Result: The "ARD Ignition Test" was not successful and codes were logged. If troubleshooting a 3480-15 code with an ETI of 6, proceed to Test Step 6.
5. Replace the Fitting that Contains the Filter in the ARD Head A. Replace fitting (7) that contains the filter in the ARD head. B. Reset all active codes and clear all logged codes by cycling the keyswitch to the OFF position. C. Perform the "ARD Ignition Test" using the electronic service tool. Refer to System Operation and Testing and Adjusting, "ARD Fuel System - Test".	Replace filter fitting	Result: The "ARD Ignition Test" was successful and no codes were logged. Return the unit to service. Result: The "ARD Ignition Test" was not successful and codes were logged. If troubleshooting a 3480-15 code with an ETI of 6, proceed to Test Step 6.

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Table 5
Troubleshooting Test Steps	Values	Results
6. Replace the Pilot Fuel Control Valve A. Replace pilot fuel control valve (8). B. Reset all active codes and clear all logged codes by cycling the keyswitch to the OFF position. C. Perform the "ARD Ignition Test" using the electronic service tool. Refer to System Operation and Testing and Adjusting, "ARD Fuel System - Test".	Pilot Solenoid Valve	Result: The "ARD Ignition Test" was successful and no codes were logged. Return the unit to service. Result: The "ARD Ignition Test" was not successful. Proceed to Test Step 7.
7. Replace the ARD Head A. Replace the ARD head. B. Reset all active codes and clear all logged codes by cycling the keyswitch to the OFF position. C. Perform the "ARD Ignition Test" using the electronic service tool. Refer to System Operation and Testing and Adjusting, "ARD Fuel System - Test".	ARD Head	Result: The "ARD Ignition Test" was successful and no codes were logged. Return the unit to service. Result: The "ARD Ignition Test" failed . Contact the Dealer Solutions Network (DSN).