Engine Overspeeds
Use this procedure in order to troubleshoot an engine overspeed or use this procedure if one of the following event codes is active.
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Event Codes     | ||
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Code and Description     | Conditions which Generate this Code     | System Response     |
190-15 Engine Speed : High - least severe (1)     |
The engine rpm has exceeded the trip point for engine overspeed for the delay time.     | The code is logged. The ECM may shut down the engine.     |
190-16 Engine Speed : High - moderate severity (2)     |
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190-0 Engine Speed : High - most severe (3)     |
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E362(1) Engine Overspeed - least severe     |
The engine rpm has exceeded the trip point for engine overspeed for the delay time.     | The code is logged. The ECM may shut down the engine.     |
E362(2) Engine Overspeed - moderate severity     |
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E362(3) Engine Overspeed - most severe     |
Probable Causes
- Turbocharger
- Intake air and starting aids
- Drop of load
Recommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
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Troubleshooting Test Steps     | Values     | Results     |
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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 leaking oil into the inlet. Repair: Repair or replace the turbocharger. Verify that the repair eliminated the problem. Result: The turbocharger is not leaking oil into the inlet. 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 the problem. Result: The atmosphere does not have combustible gases. Proceed to Test Step 4.     |
3. Check for a Sudden Drop of Engine Load A. Converse with the operator about the overspeed event.     |
Engine load     |
Result: The operator confirms that the overspeed was caused by a sudden drop of engine load. Repair: Decrease the load on the engine gradually. Verify that the repair eliminated the 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).
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