System Operation Description:
The ARD nozzles can become plugged with carbon or with debris. The Engine Control Module (ECM) periodically tests the condition of the nozzles. The engine is equipped with a system that cleans the nozzles. 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 in order to clean the nozzles.
Diagnostic Trouble Codes
Table 1 lists the diagnostic trouble code for the cleaning system for the nozzle.
Note: The following code may not be applicable for certain applications.
|Diagnostic Trouble Codes|
|CDL Code||J1939 Code||Code Description
(code descriptions may vary)
|E1070 (1)||3556-7||Aftertreatment Fuel Injector #1 not responding||The nozzle is plugged with debris or there is an electrical problem with the circuit for the electric heating element.|
|Follow the troubleshooting procedure in order to identify the root cause of the problem.|
Illustration 1 g02226613
(1) Relay for the ARD nozzle heater
(2) ARD combustion head
Illustration 2 g01946714
ARD combustion head
(3) ARD spark plug
(4) ARD nozzle
(5) ARD fork bracket
(6) ARD pilot filter connector
(7) ARD combustion head
(8) ARD main filter connector
System Operation for the Electric Heating Element
Illustration 3 g01977215
Measuring the current flow
(9) Metal part of the electrical connector
(11) Clamp-on ammeter
Overrides on the Caterpillar Electronic Technician (ET) for the Heated Nozzle
ARD Fuel Nozzle Heat Cycle – This override activates the output for the heated nozzle in order to clean the nozzle. The output remains activated for approximately one hour. The engine coolant temperature must be greater than 60° C (140° F). The heat cycle will wait for an active regeneration to complete before starting. Once the override has been activated the heat cycle will automatically start as soon as conditions have been met and cannot be deactivated. It could take up to 8 minutes for conditions to be met for the heat cycle to turn on after being activated by the override. 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.
Select the following menus in order to activate the overrides:
- “Diagnostics Tests”
- “Override Parameters”
- “Aftertreatment #1 Fuel Injector #1 Heater Override”
|Troubleshooting Test Steps||Values||Results|
|1. Check for Diagnostic CodesA. Establish communication between Caterpillar Electronic Technician (ET) and the ECM . Refer to Troubleshooting, “Electronic Service Tools”, if necessary.
B. Download the “Warranty Report” from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. Determine if a diagnostic trouble code is present.
|Diagnostic code||Result: A E1070 (1) or 3556-7 diagnostic code is present.Proceed to Test Step 2.|
|2. Check the Current Flow Through the HeaterA. Start the engine. Check the current flow through the heater. Refer to Systems Operation/Testing and Adjusting, “ARD Nozzle Heater (Current) – Test” for the correct procedure.||Amperage between 7.0 A and 14 A for a 12 V system
between 3.5 A and 7 A for a 24 V system
|Result: The current flow is between 7.0 A and 14 A for a 12 V system. Or, 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. Or, the current flow is not between 3.5 A and 7 A for a 24 V system.
Check the current flow through the heater again. The current flow is not between 7.0 A and 14 A for a 12 V system. Or, the current flow is not between 3.5 A and 7 A for a 24 V system. Proceed to Troubleshooting, “ARD Nozzle Heater – Test” for additional information.
Illustration 4 g01982036
Components of the ARD combustion head
(6) Pilot fitting that contains the filter
(7) Main fitting that contains the filter (If equipped)
|Troubleshooting Test Steps||Values||Results|
3. Replace the Fittings that Contain the Filters in the ARD Combustion Head
A restriction in the fuel system for the ARD can cause the code.
A. Replace the fittings that contain the filters in the ARD combustion head. Refer to Systems Operation/Testing and Adjusting, “Fuel System – Flush” for additional information.
B. Reset all active codes and clear all logged codes. Perform the “ARD Ignition Test” using Cat ET and verify that there are no fuel leaks. Refer to System Operation/Testing and Adjusting, “ARD Fuel Leak – Test”.
C. Click the “Disconnect” icon on Cat ET in order to disconnect Cat ET from the engine.
Turn the keyswitch to the OFF position. Wait for five seconds.
Turn the keyswitch to the ON position.
Click the “Connect” icon on Cat ET in order to connect Cat ET to the engine.
Do not use the operators switch for a stationary regeneration. The service tests provide enhanced diagnostics that are necessary for proper troubleshooting and repair.
Start a Manual DPF Regeneration in Cat ET.
Cat ET may change engine speed before starting a Manual DPF Regeneration.
The duration of the Manual DPF Regeneration depends on the soot load in the DPF. The ECM will automatically return the engine speed to low idle after the Manual DPF Regeneration is complete.
The ECM tests the nozzles for plugging after the Manual DPF Regeneration is complete. Approximately ten minutes are required in order for the test to provide a result. A code will become active if the nozzles are plugged.
Result: A E1070 (1) or 3556-7 code did not occur as a result of performing the Manual DPF Regeneration.
If the problem has been corrected, return the unit to service.
Result: The Manual DPF Regeneration did not complete successfully. There are additional codes.
Troubleshoot the additional codes. Refer to Troubleshooting for the correct procedure.
Result: A E1070 (1) code occurred as a result of performing the Manual DPF Regeneration.
4. Replace the ARD Combustion Head
A. Replace the ARD combustion head. Refer to Special Instruction, REHS4824, “Replacement of the ARD Combustion Head on Caterpillar Products with Clean Emissions Modules”.
B. Perform the “ARD Ignition Test” in Cat ET and verify that there are no fuel leaks. Refer to System Operation/Testing and Adjusting , “ARD Fuel System – Test”.
C. Use a clamp-on ammeter to verify that the current flow through the new heating element is above the expected amount for the system voltage. Refer to Systems Operation/Testing and Adjusting, “ARD Nozzle Heater – Test” for additional information.
Result: The ARD combustion head was replaced.
Return the unit to service.
Test Step 1.
Complete the procedure in the order in which the steps are listed.
- The procedure corrected the issue. – STOP
- The procedure did not correct the issue. –Repair: Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).