CONE 2K5065 - Caterpillar

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 CodesTable 1 lists the diagnostic trouble code for the cleaning system for the nozzle.Note: The following code may not be applicable for certain applications.Clear all "Active" codes using Cat ET before proceeding with the following procedure. Refer to Troubleshooting, "Diagnostic Capabilities - Clearing Active Codes for On Board Diagnostics (OBD)" for more information on clearing "Active" codes.
Table 1
Diagnostic Trouble Codes    
CDL Code    J1939 Code    Code Description
(code descriptions may vary)    Comments    
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
CEM (typical) (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 connectorSystem Operation for the Electric Heating Element
Illustration 3 g01977215
Measuring the current flow (9) Metal part of the electrical connector (10) Wire (11) Clamp-on ammeterOverrides on the Caterpillar Electronic Technician (ET) for the Heated NozzleARD 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 1 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"
"Diagnostics Tests"
"Override Parameters"
"Aftertreatment #1 Fuel Injector #1 Heater Override"
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check for Diagnostic Codes
A. 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