INSERT 3T9075 - Caterpillar

Use this procedure in order to troubleshoot an overloaded engine or use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes. You must access the engine monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".The control strategy for gas engines does not derate the engine power. Activation of this code indicates that the customer must reduce the engine's load.
Table 1
Event Code
Description Conditions which Activate the Code System Response
E242(2) Engine Overload The engine load has exceeded the trip point for the programmed delay time. The code is logged.
The alarm output is activated.
The Electronic Control Module (ECM) initiates a request for a reduction of engine power to the operator panel. Probable Causes
Driven equipment
Excessive inlet manifold air pressure
Fuel qualityRecommended Actions
Driven Equipment
Determine if the driven equipment has additional inputs of energy that could drive the engine beyond the trip point for engine overload. Ensure that the load that is placed on the engine is not over the rating of the engine. Initiate corrective measures to the installation in order to prevent the engine overload from recurring.Excessive Inlet Manifold Air Pressure
The calculated engine load increases when the air inlet pressure increases. Measure the air inlet pressure during engine operation with a load. For specific data on the engine, refer to the engine's performance data sheet.Fuel Quality
Compare the Low Heat Value (LHV) of the gas supply to the "Fuel Quality" parameter that is programmed by the customer into the ECM. The ECM uses the setting for start-up and for air/fuel ratio control at low loads.If the LHV of the fuel does not match the "Fuel Quality" parameter that is programmed into the ECM, program the correct setting for the "Fuel Quality" parameter.