C9.3 Marine Auxiliary and Generator Set Engine Caterpillar

Engine Overspeeds

Usage:

C9.3 C93

Use this procedure in order to troubleshoot an engine overspeed or use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".

Note: Some of the following codes may not be applicable for certain applications.

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Table 1
Diagnostic Trouble Codes
J1939 Code and Description	Comments
190-0 Engine Speed : High - most severe (3)	The code requires factory passwords to be cleared.
190-15 Engine Speed : High - least severe (1)	The code is logged.

Probable Causes

Proper operation of the turbocharger
Intake air
Starting aids that are not operating properly

Recommended Actions

Note: The procedures have been listed in order of probability. Complete the procedures in order.

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Table 2
Troubleshooting Test Steps	Values	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 3. Result: The turbocharger is leaking oil into the inlet. Repair: Repair or replace the turbocharger. If the problem is not resolved, proceed to Test Step 2.
2. Intake Air A. Check for combustible gases in the surrounding atmosphere. B. Check for proper operation of starting aids (if equipped).	Air Quality	Result: The atmosphere has combustible gases. Repair: Do not operate the engine in an environment with combustible gases. Verify that the repair eliminated to problem.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).