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Engine Overspeed
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 234 PID: P190 SPN: 190 FMI: 0/0 LAMP: Red SRT: |
Engine Speed High – Critical.Engine speed signal indicates engine speed above engine protection limit. |
Fuel shutoff valve closed until engine speed falls below the engine protection limit. |
 Engine Overspeed Circuit
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Circuit Description
The engine speed sensor and the camshaft position sensor provide engine speed and position information to the electronic control module (ECM) through the engine harness.
Component Location
The engine speed sensor is located in the front gear housing on the intake side of the engine. The camshaft position sensor is located on the intake side of the cylinder head near the engine brake pass-through connector. Refer to Section E for a detailed component location view.
Shop Talk
Possible causes of this fault code include external fuel sources drawn into the intake air passage, reverse powering (motoring) of the engine, and tampering of the engine speed sensor or camshaft position sensor.Inspect the intake manifold for sources of flammable vapors. Check the turbocharger seals to verify that there are no oil leaks.
Refer to Troubleshooting Fault Code t05-234
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