0210275 JOHNSON OWNER'S MANUAL

Table 1
Diagnostic Trouble Codes for the Ignition System for the Aftertreatment Regeneration Device (ARD)    
J1939 Code    Description    Conditions Which Cause the Code    System Response    
3484-5     Aftertreatment #1 Ignition : Current Below Normal     The current flow through the primary ignition circuit is below the threshold.
Usually, this condition is caused by a problem in an electrical connector.     A snapshot is triggered. The code is logged. If a regeneration is in progress, the ARD completes the regeneration. The ARD is disabled after the regeneration is complete.    
3484-6     Aftertreatment #1 Ignition : Current Above Normal     Two conditions can cause this code. There is excessive current flow through the secondary ignition circuit or there is excessive current flow through the primary ignition circuit.
The following problems can cause excessive current flow:
The spark plug is fouled.
There is a problem with the ignition wire between the ignition coil and the spark plug. These problems usually occur because the ignition wire has been damaged by excessive heat or improper routing.
The ignition coil has a problem.     A snapshot is triggered. The code is logged. If a regeneration is in progress, the ARD completes the regeneration. The ARD is disabled after the regeneration is complete.    
4265-6     Aftertreatment #1 Transformer Secondary Output : Current Above Normal     The ARD has attempted to ignite six times. All of the attempts were unsuccessful. The ECM has detected a problem with the current flow through the secondary circuit. The primary circuit is OK.
The following problems can cause this code:
The spark plug is fouled.
There is a problem with the ignition wire between the ignition coil and the spark plug. These problems usually occur because the ignition wire has been damaged by excessive heat or improper routing.
There is a problem with the ARD head. The ground probe is missing or bent.
The ignition coil has a problem.     The code is logged.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    Illustration 1 and Illustration 2 show an overview of the troubleshooting procedure. Follow the steps in order.
Illustration 1 g02001376
Illustration 2 g02061455
Components for the Ignition SystemThere are two possible locations for the ignition coil. Refer to Illustration 3 and Illustration 4.
Illustration 3 g01339562
Components for the ignition system near the ignition coilThe ignition coil is located near the oil filter. (1) Harness connector for the ignition transformer (2) Ground wire from terminal 2 to the engine block (3) Insulation material for the ignition wire (4) Engine block ground (5) Ignition wire (6) Ground wire between the engine block and the ARD combustion head (7) Ignition coil
Illustration 4 g01341479
Components for the ignition system near the ignition coilThe ignition coil is located above exhaust manifold (8) . (3) Insulation material for the ignition wire (4) Engine block ground (5) Ignition wire (6) Ground wire between the engine block and the ARD combustion head (7) Ignition coil (8) Exhaust manifold
Illustration 5 g01339565
Components for the ignition system (5) Ignition wire (6) Ground wire between the engine block and the ARD combustion head (9) Ground point on the ARD combustion head (10) Spark plug
Illustration 6 g01339607
Typical ARD combustion head (10) Spark plug (11) Spark plug electrode (12) Ground probe
Illustration 7 g01395281
Information for the ignition circuitSystem OperationThe ARD ignition system has two circuits. The primary circuit is between the ECM and the ignition coil. The secondary circuit is between the ignition coil and the ARD combustion head. The current flow through the primary circuit indicates the condition of the primary circuit and of the secondary circuit. The ECM monitors the current flow through the primary circuit. In this way, the ECM is able to detect problems with the primary circuit and the secondary circuit. A problem with either circuit must persist for approximately 20 seconds in order for the ECM to activate a -5 code or -6 code.Test Step 1. Determine the Type of Cleaning System for the Nozzles Inside the ARD Combustion Head
Illustration 8 g01978253
Typical ARD combustion head (13) Electrical connector for the heated nozzle (ARD combustion head with a heated nozzle) (14) Air line for the pressurized air (ARD combustion head that uses pressurized air for cleaning the nozzles)
Determine the type of cleaning system for the nozzles inside the ARD combustion head. Results:
The ARD purge air system is used to clean the nozzles. - Repair: Contact your local Caterpillar Technical Communicator for information on updating the system.STOP
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