C7.1 Engines and Generator Sets Caterpillar

ARD Nozzle - Test

Usage:

C7.1 770

This procedure covers the following diagnostic code:

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Table 1
Diagnostic Trouble Codes for the ARD Nozzle
J1939 Code	CDL Code	Code Description (code descriptions may vary)	Comments
3556-7	E1070-1	Aftertreatment Fuel Injector #1 : Not Responding Properly	The fuel flow to the Aftertreatment Regeneration Device (ARD) fuel nozzle is restricted.

The ARD nozzle can become plugged with carbon or with debris. The Electronic Control Module (ECM) periodically tests the condition of the nozzle. The engine is equipped with a system that cleans the nozzle. A restriction in a filter connector for the ARD combustion head can also set this code.

Electric Heating Element - The ARD combustion head contains an electric heating element. The heating element operates periodically to clean the nozzle.

Features on the Electronic Service Tool

ARD Nozzle Heater Test - This process activates the output for the heated nozzle to test the nozzle heater circuit. The output only remains activated when selected on the electronic service tool. The heat cycle stops if the engine is stopped.

ARD Fuel Nozzle Heater Override - This process activates the output for the heated nozzle to clean the nozzle. The output remains activated for approximately 1 hour. The heat cycle stops if the engine is stopped. The heat cycle continues when the engine is started. Active regenerations will not occur until the heat cycle is complete.

ARD Ignition Test - The test operates the ARD for approximately 5 minutes while the engine is running. The test determines if the ARD can generate heat. If the ARD cannot generate heat, a diagnostic code is activated. The code indicates the specific problem with the ARD.

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Illustration 1	g02231813
Typical view of the ARD combustion head (1) Insulated part of the heater wire

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Illustration 2	g02231814
Typical view of the ARD combustion head (2) Pilot filter connector

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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.

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NOTICE

Do not energize the heater for more than 30 seconds. If the heater is energized more than 30 seconds, damage to the heater can occur. Allow the heating element to cool for 2 minutes between power cycles.

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

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check for Diagnostic Codes A.Turn the keyswitch to the ON position. B. Establish communication between the electronic service tool and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary. C. Download the following items before performing any troubleshooting or clearing any diagnostic codes: · Warranty Report · Aftertreatment Regeneration Trigger History · Product Status Report with Histograms D. Use the electronic service tool to perform the "ARD Ignition 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%, use the electronic service tool to perform a Manual DPF Regeneration.	Diagnostic codes	Result: The "ARD Ignition Test" was not successful and a 3556-7 (E1070-1) diagnostic code was logged. Proceed to Test Step 2. Result: The "ARD Ignition Test" was not successful and another diagnostic code was logged. Repair: Troubleshoot the other diagnostic codes. Refer to Troubleshooting, "Diagnostic Trouble Codes". Result: The "ARD Ignition Test" was successful and no codes were logged. Return the unit to service.
2. Check the Current Flow Through the ARD Nozzle Heater A. Turn the keyswitch to the OFF position. B. Connect a suitable clamp-ammeter around the insulated part of the heater wire (1). C. Turn the keyswitch to the ON position. D. Use the "ARD Nozzle Heater Test" in the electronic service tool to switch on the ARD nozzle heater. E. Record the current reading on the ammeter. F. Use the "Aftertreatment #1 Fuel Injector #1 Heater Override" in the electronic service tool to switch off the ARD nozzle heater.	Battery voltage	Result: The current is below the expected level for the system. Repair: Diagnose and repair the fault with the ARD nozzle heater circuit. Refer to Troubleshooting, "ARD Nozzle Heater - Test". When the nozzle heater circuit has been repaired, proceed to Test Step 4. Result: The current is correct for the system. The ARD nozzle heater is operating correctly. Proceed to Test Step 3.
3. Replace the ARD Filter Connector in the ARD Combustion Head A. Replace pilot filter connector (2) in the ARD combustion head. B. Clear all diagnostic codes. C. Use the electronic service tool to perform the "ARD Ignition 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%, use the electronic service tool to perform a Manual DPF Regeneration.	ARD filter connector	Result: The "ARD Ignition Test" was not successful and a 3556-7 (E1070-1) diagnostic code was logged. Proceed to Test Step 5. Result: The "ARD Ignition Test" was not successful and another diagnostic code was logged. Repair: Troubleshoot the other diagnostic codes. Refer to Troubleshooting, "Diagnostic Trouble Codes". Result: The "ARD Ignition Test" was successful and no codes were logged. Return the unit to service.
4. Perform an ARD Nozzle Heat Cycle A. Start the engine. Note: The ECM must have an engine speed signal to initiate the ARD nozzle heater cycle. B. Initiate the cycle for the ARD nozzle heater. The cycle for the ARD nozzle heater will cycle the nozzle ON and OFF for an hour to clean the nozzle. C. When the "ARD Nozzle Heat Cycle" is complete, use the electronic service tool to perform an "ARD Ignition Test".	ARD filter connector	Result: The "ARD Ignition Test" was not successful and a 3556-7 diagnostic code was logged. Proceed to Test Step 5. Result: The "ARD Ignition Test" was not successful and another diagnostic code was logged. Repair: Troubleshoot the other diagnostic codes. Refer to Troubleshooting, "Diagnostic Trouble Codes". Result: The "ARD Ignition Test" was successful and no codes were logged. Return the unit to service.
5. Replace the ARD Combustion Head A. Replace the ARD combustion head. Refer to Disassembly and Assembly, "Combustion Head Group (ARD) - Remove and Install". B. Clear all diagnostic codes. C. Use the electronic service tool to perform the "ARD Ignition 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%, use the electronic service tool to perform a Manual DPF Regeneration.	ARD filter connector	Result: The fault is still present Contact the Dealer Solutions Network (DSN). Result: The ARD ignition test was successful and no codes were logged. Return the unit to service.