PLUG AS-ORIFICE 2385508 - Caterpillar

Use this procedure in order to troubleshoot low prelubrication pressure 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".
Table 1
Event Code
Description Conditions which Activate the Code System Response
E233(1) Low Engine Pre-Lube Pressure The prelubrication pressure did not exceed the trip point during the programmed delay time. The code is logged.
Engine starting is prevented. Probable Causes
Air supply pressure
Prelube pump lubricator
Exhaust outlet piping for the prelube pump air motor
Engine oil supply
Pump control solenoid
Prelubrication pressure switch
Prelube pumpRecommended Actions
Air Supply Pressure
Check that the air supply pressure at the prelube's pump control solenoid is adequate. Check the air supply pressure at the prelube pump while the solenoid is engaged. Ensure that there is adequate air pressure for the operation of the pump. Inspect the system for leaks and/or blockage.Prelube Pump Lubricator
Check that the prelube pump lubricator is adequately filled with the correct lubricant.Check that the lubricator is functioning correctly during the prelube cycle.Exhaust Outlet Piping for the Prelube Pump Air Motor
Check that the exhaust outlet piping for the prelube pump air motor is not restricted.Engine Oil Supply
Check the engine oil level. Add oil until the oil level is between the "ADD" and "FULL" marks on the oil level gauge. Inspect the lubrication system for leaks.If the supply of engine oil is correct, look for leaks in the oil lines for the prelube pump. Make sure that the supply of engine oil is not obstructed. Make repairs, as needed.Pump Control Solenoid
Ensure that the output for the pump control solenoid is being activated by the Electronic Control Module (ECM). Check for diagnostic codes that are related to the solenoid. Refer to Troubleshooting, "Prelubrication - Test" for information that is related to troubleshooting the solenoid circuit.Prelubrication Pressure Switch
The prelube pump pressure switch must close before the ECM will initiate engine starting. The switch must detect 9 3 kPa (1.3 0.4 psi) in the engine's oil passages prior to closing. Ensure that the switch is operating correctly.Prelube Pump
The prelube pump may have a mechanical problem. Inspect the prelube pump. Refer to the engine's Disassembly and Assembly for details.