ENGINE AR 7N6430 - Caterpillar

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 ToolARD 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.
Illustration 1 g02231813
Typical view of the ARD combustion head
(1) Insulated part