P0194 Code - Fuel Rail Pressure Sensor Circuit Intermittent

What Does P0194 Mean?

The P0194 code is specific to diesel engines and will not likely be used in reference to gas engines. The test associated with this code is designed to monitor the condition of the fuel rail pressure (FRP) sensor. This consists of all the wires that are part of the FRP sensor circuit which allow the computer to monitor fuel rail pressure. A diesel motor utilizes this information to properly meter the air/fuel ratio.

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What are the common causes of P0194 ?

• The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
• Fuel with a large percentage of sulfur will clog the DPF quickly
• Some aftermarket accessories and performance modifications

How do you troubleshoot P0194 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0194 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

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