NUT-BEARING 6G4701 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the following codes:Also use this procedure if a fault is suspected with the ARD ignition system.
Table 1
Diagnostic Trouble Codes for the Ignition System for the Aftertreatment Regeneration Device (ARD)    
J1939 Code     Description     Notes    
3484-5     Aftertreatment #1 Ignition : Current Below Normal     The Electronic Control Module (ECM) detects the following conditions:
The current flow through the primary ignition circuit is below the threshold while the ECM is trying to spark the plug.
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.
If a regeneration is in progress, the ARD completes the regeneration.    
3484-6     Aftertreatment #1 Ignition : Current Above Normal     The ECM detects the following conditions:
There is excessive current flow through the secondary ignition circuit or there is excessive current flow through the primary ignition circuit.
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
4265-5     Aftertreatment #1 Transformer Secondary Output : Current Below Normal     The ECM detects the following conditions:
The ARD has attempted to ignite three times. All of the attempts were unsuccessful. There is a fault with the current flow through the secondary circuit. The primary circuit is OK.
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
4265-6     Aftertreatment #1 Transformer Secondary Output : Current Above Normal     The ECM detects the following conditions:
The ARD has attempted to ignite three times. All of the attempts were unsuccessful. The ECM has detected a fault with the current flow through the secondary circuit. The primary circuit is OK.
The ECM has been powered for at least 2 seconds.
If equipped, the warning lamp will come on. The ECM will log the diagnostic code.    
Illustration 1 g02452934
Schematic diagram for the ARD ignition circuit
Illustration 2 g01970576
Typical view of the pin locations on the P2 connector for ARD ignition (12) ARD ignition coil supply (13) ARD ignition coil return
Illustration 3 g02166895
Typical view of the pin locations on the 31-pin connector and the 40-pin connector for the ARD ignition circuit
Illustration 4 g02452961
Typical view of Clean Emissions Module (CEM) (1) Ignition coil (2) 40-pin connector (3) ARD combustion head
Illustration 5 g01970517
Identification of terminals on the ignition coil
Illustration 6 g02931777
ARD combustion head (4) ARD combustion head (5) Spark plug (6) Ignition wire (7) Ground electrode (8) Spark plug electrode (9) Ground wire (10) Ground pointSystem 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 faults in the primary circuit and