RETAINER AS 7T1149 - Caterpillar

Use this procedure to troubleshoot the following code:Note: Refer to Troubleshooting, "Cat ET Service Features" for information about service features.
Table 1
Diagnostic Trouble Codes
J1939 Code CDL Code Code Description Comments
3473-31 E1025 (2) Aftertreatment #1 Failed to Ignite The Aftertreatment Regeneration Device (ARD) has failed to ignite. Usually, the "failed to ignite" code is accompanied by another logged code that indicates the condition that caused the failure to ignite. Caterpillar Channel 1 VideosFor supplemental information on this procedure, refer to the following video. The previous training has been replaced with the video below.Note: A CWS login is required to access Caterpillar Channel 1. Scan the QR code below with a QR enabled device or copy the link that follows.
Illustration 1 g06318188https://channel1.mediaspace.kaltura.com/media/C9.3+-+C18+Tier+4+Final+Engine+ARD+Failed+to+Ignite/1_vk5snpdo
Components for the Ignition SystemThe ignition coil is located on the Clean Emissions Module (CEM) mounting plate. Refer to Illustration 2.
Illustration 2 g03750980
CEM (typical)
(1) ARD ignition coil
(2) Relay for the ARD nozzle heater
(3) Cable for CEM electrical connector to ECM
(4) ARD combustion headSystem OperationThe ARD ignition system has two circuits. The primary circuit is between the A5:E2 Aftertreatment Controller and the ARD ignition coil. The secondary circuit is between the ARD ignition coil and the ARD spark plug. 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.Complete the procedure in the order in which the steps are listed.
Table 2
Associated Diagnostic Trouble Codes
J1939 Code CDL Code
3837-17 E1170 (1)
3487-7 E1041 (1)
3480-15 or 3480-16 E1050 (1) or (2)
4077-15 or 4077-16 E1051 (1) or (2)
3480-17 or 3480-18 E1052 (1) or (2)
4077-17 or 4077-18 E1053 (1) or (2)
3609-15 E1156 (1)
4301-5 3182-5
4301-6 3182-6
No associated codes A problem with the ignition circuit is the most likely cause of a logged E1025 (2) or 3473-31 code with no additional codes.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Associated Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Electronic Control Module (ECM).
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. If any of the associated codes in Table 2 are logged, troubleshoot the codes before continuing with this procedure.
Associated Codes
Result: An associated code is active or logged.
Repair: Troubleshoot the associated codes before continuing with this procedure.
Result: An associated code is not active or logged.
Proceed to Test Step 2.
2. Inspect the Components
Carefully following this procedure is a good way to identify wiring problems.
A. Visually inspect the components for the ARD ignition system. Look for the following problems:
1. Loose connections or damaged connectors
2. Moisture on the connectors or the wiring
3. Damage that is caused by excessive heat
4. Damage that is caused by chafing
5. Improper routing of wiring
6. Damaged insulation
B. Verify that each end of the ground wire is securely connected to both ground points.
C. Push the boot on each end of the ignition wire. This tests whether the clip inside the boot is connected to