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Engine Overspeed
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 234 PID: P190 SPN: 190 FMI: 0 LAMP: Red SRT: |
Engine speed signal indicates engine speed is greater than 2650 rpm. |
Fuel shutoff valve is closed until the engine speed drops. The fuel shutoff valve will open when engine speed falls below 2000 rpm. |
 Engine Overspeed Circuit
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Circuit Description
The engine speed/position sensor provides engine speed and position information to the electronic control module (ECM) through the engine harness.
Component Location
The engine speed/position sensor is located above the air compressor.
Shop Talk
Possible causes of this fault code include external fuel sources drawn into the intake air passage, reverse powering (motoring) of the engine, or tampering of the engine speed/position sensors.
Inspect the intake manifold for sources of flammable vapors. Check the turbocharger seals to verify that there are no oil leaks.
- Inspect the engine speed/position sensors for damage or tampering.
Refer to Troubleshooting Fault Code t05-234
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