C7.1 Engines and Generator Sets Caterpillar

ARD Fuel Pressure Is Low

Usage:

C7.1 770

This procedure covers the following diagnostic trouble codes:

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

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Table 1
Diagnostic Trouble Codes
J1939 Code	CDL Code	Code Description	Comments
3480-17	E1052 (1)	Low Aftertreatment #1 Fuel Pressure #1 - Least Severe	There are Enhanced Troubleshooting Indicators for this code.
3480-18	E1052 (2)	Low Aftertreatment #1 Fuel Pressure #1 - Moderate Severity	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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Table 3
Associated Diagnostic Trouble Codes
J1939 Code	CDL Code
5580-18	E198
3427-5	5423-5
3427-6	5423-6

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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	g06126697
ARD Fuel Manifold (7) ARD fuel manifold filter (8) Pilot fuel control valve

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

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Table 4
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.
2. Check for External Leaks A. Check for external leaks. Inspect the fuel lines from the pump to the fuel manifold. Check for pinched lines or leaking lines.	External Leaks	Result: A leak or pinched line was not found. Proceed to Test Step 4. Result: A leak or pinched line was found. Repair: Repair all damaged lines or leaking lines. Perform the "ARD Ignition Test" by using the electronic service tool. Refer to System Operation and Testing and Adjusting, "ARD Fuel System - Test". If the "ARD Ignition Test" was successful, return the unit to service. If the ARD ignition test was not successful, Proceed to Test Step 3.
3. Fuel Supply A. Visually check the fuel level in the fuel tank. Do not rely on the fuel gauge only. B. Ensure that the vent in the fuel cap is not filled with debris. C. Ensure that the fuel supply valve (if equipped) is in the full OPEN position. D. If the temperature is below 0 °C (32 °F), check for solidified fuel (wax). E. Check the primary filter/water separator for water in the fuel. F. Check for fuel supply lines that are restricted. G. Check that the low-pressure fuel lines are tight and secured properly. H. Check that the Electric Fuel Lift Pump (EFLP) is operating. If the EFLP is suspect, refer to Troubleshooting, "Fuel Transfer Pump - Test". I. Replace the in-line fuel filter that is upstream of the primary fuel filter. J. Replace the primary fuel filter. K. Check the diesel fuel for contamination. Refer to Systems Operation, Testing, and Adjusting, "Fuel Quality - Test". L. Check for air in the fuel system. Refer to Systems Operation, Testing, and Adjusting, "Air in Fuel - Test". M. Ensure that the fuel system has been primed. Refer to Systems Operation, Testing, and Adjusting, "Fuel System - Prime".	Fuel system	Result: The fuel supply is not OK. Repair: Repair the fuel system or replace the fuel system components, as necessary. Result: The fuel supply is OK. Proceed to Test Step 4.
4. Check the Power to the ARD Fuel Pump A. Turn the engine OFF. B. Disconnect the electrical connector for the ARD fuel pump. C. Start the engine. D. Establish communications between the electronic service tool and the Engine ECM. E. Clear the active event code. F. Select "Aftertreatment Fuel Pump Relay Override" in the electronic service tool to activate the pump. G. Measure the voltage between pins 1 and 2 in the ARD fuel pump harness connector. H. Deactivate the override. I. Turn the keyswitch to the OFF position. J. Reconnect the ARD fuel pump electrical connector.	ARD pump supply voltage	Result: The measured voltage is less than battery voltage. Repair : Investigate the cause of low battery voltage. Result: The measured voltage is equal to battery voltage. Proceed to Test Step 5.
5. 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 Table2 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). Proceed to Test Step 6.
6. Replace the Filter for the ARD Fuel Manifold A. Replace filter (7) for the ARD fuel manifold. B. Reset all active codes and clear all logged codes by using the electronic service tool. C. Perform the "ARD Ignition Test" by using the electronic service tool. Refer to System Operation and Testing and Adjusting, "ARD Fuel System - Test". 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.	Filter	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 Fitting that Contains the Filter in the ARD Head A. Replace the fitting 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". 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.	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. Proceed to Test Step 8.
8. 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". 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.	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. Contact the Dealer Solutions Network (DSN).