C13, C15, and C18 Engines Troubleshooting – Diesel Particulate Filter Temperature Is High

A. Establish communication between the 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.

Troubleshoot any associated diagnostic codes listed in Table 2 that are present before continuing with this procedure.

Proceed to Test Step 2.

Result: An associated code is active or logged.

Troubleshoot the associated codes before continuing with this procedure.

Refer to Troubleshooting, “Diagnostic Trouble Codes” in order to troubleshoot the associated diagnostic code.

A. Several factors can cause a calculated high exhaust temperature. Refer to “Troubleshooting, Exhaust Temperature Is High” for further information on calculated high exhaust temperatures

Result: The engine is not experiencing high exhaust temperatures.

Proceed to Test Step 3.

A. Remove the inlet section (DOC) from the DPF.

B. Use Cat ET to set the value of the “ARD Manual Disable Status” configuration parameter to “Disabled” in order to disable the ARD.

C. Perform a manual cylinder cutout test. Manually cut out each cylinder while the exhaust is monitored. As each cylinder is cut out, look for a decrease in white smoke.

Replace any injectors that cause the engine to smoke and run rough when the cylinder is not cut out.
Clean the inside of the inlet section of the DPF.
Assemble the DPF. The engine must be run with no load at 1400 rpm for at least 15 minutes. If the white smoke continues after 15 minutes, the engine must continue to run until there is no white smoke.

Set the value of the “ARD Manual Disable Status” configuration parameter to “Not Disabled” in order to enable the ARD. Proceed to Test Step 5.

Result: A faulty injector is not found.

Proceed to Test Step 4.

A. Remove the inlet section (DOC) from the DPF.

B. Inspect the inside of the inlet section and the front face of the DPF. Look for oil and for excessive soot.

C. Inspect the inlet to the Diesel Oxidation Catalyst (DOC). Inspect the inlet of the catalyst and check the catalyst for plugging.

A small amount of soot is a normal condition. Contact your local technical communicator for Caterpillar engines if you suspect that the amount of soot is excessive. Continue with this procedure after you have received guidance from the technical communicator.

Perform the following procedure:
1. Inspect the outlet of the turbocharger. Clean the oil from the inside of the inlet section of the DPF.
2. Assemble the DPF. The engine must be run with no load at 1400 rpm for at least 15 minutes. If the white smoke continues after 15 minutes, the engine must continue to run until there is no white smoke.
Proceed to Test Step 5.

Result: Oil is not found.

Proceed to Test Step 5.

This test must be performed through Cat ET. The Cat ET service tool enhances the diagnostics during the service test.
A. Reset all active codes and clear all logged codes.

B. Start a “Manual DPF Regeneration”.

Return the engine to service.

Result: The “Manual Diesel Particulate Filter Regeneration” was not successful.

Troubleshoot any diagnostic codes that are present, if no codes are present, Proceed to Test Step 6.

A. Replace the ARD combustion head.

B. Select the ARD Ignition Test tab. 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.

C. Perform an “ARD Ignition test”. to verify proper operation of the Regeneration system.

Return the engine to service.