SCREEN ASSEM. 6J3795 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with a prelubrication system or if one of the diagnostic codes or the event code in Table 1 is active or easily repeated. Refer to Troubleshooting, "Event Code List" for information about event codes and the default trip points for these codes. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes.
Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
E098(1) Engine Prelube Override The engine has started without completing the engine prelubrication. The code is logged.
338-5 Engine Pre-Lube Pump Relay current below normal The engine's Electronic Control Module (ECM) detects an open circuit at the prelube pump relay.
The ECM detects a short to battery voltage at the prelube pump relay.
The ECM can only detect this condition when the prelube pump relay is not energized.
338-6 Engine Pre-Lube Pump Relay current above normal The ECM detects a short circuit at the prelube pump relay.
The ECM can only detect this condition when the prelube pump relay is not energized. The ECM has the ability to automatically lubricate the engine before cranking. This may increase the life of certain engine parts by lubricating the parts before the starting motor is engaged.The prelubrication system is activated when the start/run/stop switch is turned to the START position. The system prevents the starting motor from engaging while the pump builds pressure in the engine oil system. After a short period of time, the starting motor is allowed to engage. The start/run/stop switch must be left in the START position for the duration of the prelube cycle in order to ensure that the engine is properly lubricated before start-up.The engine will start without proper lubrication. If the prelube override switch is turned to the ON position the prelube cycle will be bypassed. In order to record the instances of improper lubrication, the event code E098 is generated whenever the prelubrication system is bypassed.A test on Caterpillar Electronic Technician (ET) allows the technician to activate the prelube system. The test is functional only when the engine speed is zero rpm. The test is accessed by selecting the following menus on Cat ET:
"Diagnostics"
"Diagnostic Tests"
"Override Parameters"
Illustration 1 g01213741
Typical schematic
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
Illustration 2 g01229009
Thoroughly inspect connectors (1), (2), and (3). Also, thoroughly inspect all of the other connectors for the circuit. Refer to Troubleshooting, "Inspecting