5032915 JOHNSON *O RING

Table 1
Diagnostic Trouble Codes
J1939 Code CDL Code Description Comments
3474-14 E1026 (1) Aftertreatment #1 Loss of Combustion The Aftertreatment Regeneration Device (ARD) has stopped generating heat at least four times during an active high-speed regeneration.
Associated codes may indicate the system that caused the loss of combustion to occur.
The code must be cleared with the "Reset All" button on the active diagnostics screen in Caterpillar Electronic Technician (ET). If an active regeneration is initiated with the operator forced regeneration switch, the Engine Control Module (ECM) clears this code automatically.
3474-31 E1026 (2) Aftertreatment #1 Loss of Combustion The ARD has stopped generating heat at least four times during an active regeneration.
Associated codes may indicate the system that caused the loss of combustion to occur.
The code must be cleared with the "Reset All" button on the active diagnostics screen in Cat ET. If an active regeneration is initiated with the operator forced regeneration switch, the ECM clears this code automatically. System OperationThe combustion air system routes pressurized air from the outlet of the turbocharger compressor to the ARD. The combustion air is mixed with fuel inside the ARD. The air/fuel mixture is ignited and the air/fuel mixture is burned to provide heat for the diesel particulate filter.
Illustration 1 g03751942
Typical combustion air system
(1) Outlet for the combustion air to ARD combustion head
Illustration 2 g03751976
Overview for the ARD combustion head
(2) Flame detection temperature sensor
(3) Electrical connection for the ARD nozzle heater
(4) ARD pilot filter connector
(5) ARD main filter connector
(6) ARD combustion head
(7) ARD spark plug
(8) Inlet for the combustion airWhen the A5:E2 aftertreatment controller determines that the combustion air valve should be opened, the controller sends a pulse width modulated (PWM) signal to the valve. This PWM signal causes the valve to open. A position sensor located in the combustion air valve assembly then sends a signal back to the A5:E2 aftertreatment controller showing the actual position of the valve.
Table 2
Associated Diagnostic Trouble Codes
J1939 Code CDL Code
102-18 E1045
3480-15 or -16 E1050
3480-17 or -18 E1052
3487-7 E1041 (1)
4077-15 or -16 E1051
4077-17 or -18 E1053 Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Associated Diagnostic Trouble Codes
A. Establish communication between Cat ET and the Electronic Control Module (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. If troubleshooting a E1026 or a 3474 code, access the Aftertreatment Regeneration History in Cat ET. Click the information tab, then click History, and then click Aftertreatment Regeneration History. If there were three successful regenerations since the code was logged, do not troubleshoot this code. Clear the code and return the unit to service.
Table 2 lists the diagnostic trouble codes that are associated with a E1026 code. Determine if any of the codes in Table 2 are present.
Diagnostic Code
Result: An associated diagnostic trouble code is not present.
Proceed to Test Step 2.
Result: An associated diagnostic trouble code is present.
Repair: Refer to Troubleshooting, "Diagnostic Trouble Codes" to troubleshoot the associated diagnostic code.
2. Check the Current Flow Through the Heater
A. Verify that the engine is off. Check the current flow through the heater. Refer to Systems Operation/Testing and Adjusting, "ARD Nozzle Heater (Current) - Test" for the correct procedure.
Between 7.0 A and 14 A for a 12 V system. Or, between 3.5 A and 7 A for a 24 V system
Result: 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.
Repair: There may be a problem with the ARD nozzle. Refer to Troubleshooting, "ARD Nozzle Heater - Test".
3. Perform the "ARD Air System Service Test"
A. Reset all active codes and clear all logged codes. Use Cat ET to perform an "ARD Air System Service Test" to verify that the problem is resolved.
ARD Air System Service Test
Result: The "ARD Air System Service Test" failed.
Repair: There is a problem with the ARD combustion air system. Refer to Troubleshooting, "ARD Combustion Air - Test".
Result: The "ARD Air System Service Test" passed.
Proceed to Test Step 4.
Table 4
Troubleshooting Test Steps Values Results
4. Clean the Flame Detection Temperature Sensor
A. Remove flame detection temperature sensor (2).
B. Clean the flame detection temperature sensor. Use a nonmetallic cleaning pad to clean the sensor.
Flame Detection Temperature Sensor
Result: The components are clean. The flame detection temperature sensor is not damaged.
Repair: Install the flame detection sensor.
Proceed to Test Step 5.
Result: The flame detection temperature is damaged.
Repair: Replace flame detection temperature sensor.
Proceed to Test Step 5.
5. Check the ARD for Proper Operation
A. Reset all active codes and clear all logged codes. Use Cat ET to perform an "ARD Ignition Test" to verify that the problem is resolved.
The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, the Manual DPF Regeneration must be performed using Cat ET.
ARD Ignition Test
Result: The test is su