Engine Overspeeds
This procedure covers the following diagnostic trouble code:
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| Diagnostic Trouble Code for Engine Overspeed | ||
|---|---|---|
| J1939 Code | Description | Information About the Code |
| 190-0 | Engine Overspeed : High - most severe (3) | The engine has exceeded the rated speed plus 700 rpm for 2 seconds. There are no diagnostic trouble codes for the speed sensors. The engine has been running for at least 2 seconds. |
The Electronic Control Module (ECM) limits the flow of fuel in order to prevent the engine speed from exceeding the rated speed plus 700 rpm. When the engine speed has dropped to less than the rated speed, the 190-0 code will be reset.
The following operating conditions can cause the engine speed to exceed this value:
- On a mobile machine, an incorrect transmission gear is selected.
- Use of an incorrect fuel
- Combustible gases in the air inlet for the engine
- Failure of the spring in the mechanical governor
If the engine speed exceeds the rated speed plus 700 rpm, the ECM illuminates the warning lamp and the stop lamp. A190-0 code is logged and the engine may shut down.
The history of engine overspeeds can be viewed on the electronic service tool.
If a failure of the spring in the mechanical governor is suspected, inspect the governor mechanism for damage.
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