823799T 9 Mercury CARBURETOR, (WME 53-3), Bottom

Table 1
Event Code    
Description    Conditions which Activate the Code    System Response    
E004 (3) Engine Overspeed Shutdown     The engine rpm has exceeded the trip point that is programmed into the Electronic Control Module (ECM).     The shutdown output is activated. The gas shutoff valve is de-energized. the ignition is shut off. The code is logged. The engine is shut down.    
E362 (3) Engine Overspeed Shutdown    Note: Refer to Troubleshooting, "Engine Monitoring System" for information on trip points and delay times.The ignition is immediately terminated when the emergency stop button is pressed. Unburned gas remains in the air inlet and exhaust system.
Unburned gas in the air inlet and exhaust system may ignite when the engine is started. Personal injury and/or property damage may result.Before starting an engine that may contain unburned gas, purge the unburned gas from the air inlet and exhaust system. Refer to the topic on purging unburned gas in the "Starting the Engine" section.
Probable Causes
Low trip point for engine overspeed
Signal from the signal driver in the master Electronic Control Module (ECM) for the actuator of the throttle
There is a problem with the input for the keyswitch.
Energy of the driven equipment
Slow governor response
Binding of the throttle actuatorRecommended Repairs
Check the Trip Point
Note: Do not program the trip point for engine overspeed higher than the maximum ratings of the driven equipment.The trip point or engine overspeed may be too low. Verify that the trip point for the engine overspeed is properly programmed. Typically, this parameter is set at 118 percent of rated speed.This parameter requires a factory password in order to change the trip point. Change the trip point to an acceptable speed, if necessary.Check for Diagnostic Codes that Relate to the Signal from the Signal Driver in the Master ECM
Check for diagnostic codes that relate to the actuator of the throttle.Investigate the diagnostic code(s). Make the necessary repairs.Verify that the Keyswitch Input is Working Properly
An engine shutdown or an engine overspeed may occur due to a problem with the input for the keyswitch for one of the following:
Actuator for the throttle
Actuator for the turbocharger compressor bypass valve
Actuator for the fuel metering valve
ECMVerify that the input for the keyswitch to the actuators is battery voltage when the mode switch is not in the OFF/RESET position.The ECM will be shutdown and the ECM will indicate a status of "OFF" when the keyswitch input is low. Check the Driven Equipment
Determine if the driven equipment has additional inputs of energy that could drive the engine beyond the trip point. Make corrections to the installation in order to prevent the overspeed from recurring.Check for Slow Governor Response
Observe the "Speed Governor Adjustment" screen on the Caterpillar Electronic Technician (ET). Look for the engine response to the worst cases for step-loading and unloading.Check for Binding of the Throttle Actuator
Remove the electrical power from the engine. Move the throttle plate while you feel the motion. If the motion is sticky and/or rough, investigate the cause of the binding. Make the necessary repairs.