VALVE & MOUNTING AS-WATER 2688769 - Caterpillar

Use this procedure in order to troubleshoot an engine overspeed or use this procedure if one of the following event codes is active. 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
Event Code
Code and Description Conditions which Generate this Code System Response
E190(1) Engine Overspeed The engine rpm has exceeded the trip point for engine overspeed for the delay time. The code is logged.
The Electronic Control Module (ECM) will disable fuel injection for engine speeds that are above the trip point. Probable Causes
Intake air is combustible
Sudden drop of loadRecommended Actions
Table 2
Troubleshooting Test Steps Value Results
1. Proper Operation of the Turbocharger
A. Check for proper operation of the turbocharger
B. Check for any oil that may be leaking into the air inlet.
Turbocharger
Result: The turbocharger is not leaking oil into the inlet.
Proceed to Test Step 2
The turbocharger is leaking oil into the inlet.
Repair or replace the turbocharger.
2. Intake Air is Combustible
A. Check for combustible gases in the surrounding atmosphere.
Intake air
Result: There are no combustible gases in the surrounding atmosphere.
Result: There are combustible gases in the surrounding atmosphere.
Do not operate the engine in an environment with combustible gases.