WORM 5D8455 - Caterpillar

Use this procedure to troubleshoot a high inlet temperature for the catalytic converter. Also, use this procedure if one of the following diagnostic codes is active. Refer to Troubleshooting, "Diagnostic Trouble Codes" for information about diagnostic trouble codes. Access the engine monitoring system on Caterpillar Electronic Technician (ET) to view the current trip points for these engine events. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring Parameters".
Table 1
Engine Events
J1939 Code and Description Conditions which Generate the Code System Response
4289-0 Aftertreatment #1 Three Way Catalytic Converter Intake Gas Temperature : High - most severe (3) The inlet temperature for the catalytic converter is above the trip point for the programmed delay time. The code is logged.
The red stop lamp is illuminated.
The engine is shut down.
4289-15 Aftertreatment #1 Three Way Catalytic Converter Intake Gas Temperature : High - least severe (1) The code is logged.
The amber warning lamp is illuminated. Probable Causes
Fuel quality
Ignition system
Incorrect engine timing
Engine misfire
Plugging of the catalyst substrate
DetonationRecommended Actions
Fuel Quality
Run a site fuel analysis.Data from a gas analysis is required for determining the correct settings for the fuel quality and for the specific gravity of the gas. The data must be entered into the Caterpillar Software , "Gas Engine Rating Pro (GERP)".Ignition System
Inspect the ignition system for the following conditions:
Check the connections between the ignition transformers and the spark plug wires. A loose connection can cause arcing and misfires.
Check the connections between the spark plug wires and the spark plugs for a loose connection or for pin holes that are caused by arcing. Both conditions can cause misfires.
Check for corrosion on the terminal of the spark plug and check for wear on the electrode. Both conditions can cause misfires.Losses or misfires are caused by shorts or excessive moisture.Maintain the spark plug according to the Operation and Maintenance Manual.Incorrect Engine Timing
Engine timing that is excessively retarded can affect exhaust temperatures and coolant temperatures of the engine.Verify that the timing is correct. Refer to Testing and Adjusting, "Ignition Timing - Adjust" for the correct timing calibration procedure.Engine Misfire
An engine misfire allows unburned gas into the exhaust system. The excess gas can be burned in the inlet of the catalytic converter. High exhaust temperature at the inlet of the catalytic converter will result.Check the engine for a misfire condition. Refer to Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable" for details.Plugging of the Catalyst Substrate
If the catalyst substrate becomes plugged with debris, ash, or oil build-up, the exhaust temperatures at the inlet of the catalytic converter will increase. Damage to the catalyst substrate may result.Check the back-pressure of the exhaust system to determine if plugging as occurred. Refer to Testing and Adjusting, "Catalytic Converter Pressure - Test" for information that is related to measuring the back-pressure of the engine exhaust system.Detonation
Detonation from high engine load causes high exhaust temperatures. Correct the problem