PIPE,PILOT 0935542 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
4765-18
Aftertreatment #1 Diesel Oxidation Catalyst Intake Gas Temperature Low - moderate severity (2) 2165-2
Low Aftertreatment #1 Diesel Oxidation Catalyst #1 Intake Gas Temperature (2) The ECM detects that the DOC inlet temperature is below the acceptable range for regeneration to occur.
4766-18
Aftertreatment #1 Diesel Oxidation Catalyst Outlet Temperature Low - moderate severity (2) 2512-2
Low Aftertreatment #1 Diesel Oxidation Catalyst #1 Outlet Gas Temperature (2) The ECM detects that the DOC outlet temperature is below the acceptable range during HC dosing.
Table 2
Troubleshooting Test Steps Value Results
1. Check for Exhaust Leaks
A. Start the engine.
B. Check the exhaust system for proper installation.
C. Check for loose or broken exhaust joints.
D. Inspect the exhaust system between the turbocharger outlet and the tailpipe outlet for signs if an exhaust leak.
Exhaust Leaks
Results: An exhaust leak was not found.
Proceed to Test Step 2.
Result: An exhaust leak was found.
Repair: Repair or replace the component causing the exhaust leak.
2. Check for High Sulfur Fuel
A. Ensure that the correct specification of the fuel is being used. Refer to the Operation and Maintenance Manual for the correct specification.
Note: If a high sulfur fuel is used, this fault will reoccur and a replacement CEM may be required.
Fuel Type
Result: High sulfur fuel is being used.
Repair: Drain the fuel tank, flush the fuel lines, and replace the fuel filters. Refill the fuel tank with the correct specification of fuel.
Proceed to Test Step 3.
Result: High sulfur fuel is not being used.
Proceed to Test Step 3.
3. Recover the Aftertreatment System
A. Connect the electronic service tool.
B. Start and run the engine.
C. Perform the "Aftertreatment Recovery Procedure".
Aftertreatment Recovery Procedure
Result: The "Aftertreatment Recovery Procedure" completed successfully.
Return the unit to service.
Result: The "Aftertreatment Recovery Procedure" failed. An error code is generated by the electronic service tool.
Repair: Troubleshoot the error code. Refer to Troubleshooting, Service Tool Error Identifiers.
Result: The "Aftertreatment Recovery Procedure" failed. No error codes are generated by the electronic service tool.
Repair: A replacement CEM may be required. Contact the Dealer Solutions Network (DSN) for further assistance.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).