Diesel Fuel Pressure Sensor Testing

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Diesel fuel pressure sensor testing.

Check the fuel rail pressure sensor voltage at key on engine off. Turn the ignition key and then the engine and record the pressure readings both times. To check the ground wire check for voltage by back probing the connector with it connected. Although the pressure sensor is often the cause of a p0452 or p0453 there are other possible causes.

Install the pressure tester to the test port when the engine is cold. If this sensor isn t working correctly the computer gets false information and turns on the check engine light. Minimize the help page. It should be about 0 5 volts.

Using manufacturer s data identify the output signal circuit for the fuel rail pressure sensor. Start the scope to see live data. A car with a port injected pump should yield a reading between 30 and 80 psi. Testing the fuel pressure.

The fuel tank pressure sensor has the final say in telling the computer if the tank pressure is holding during a key on pressure test. Connect picoscope channel a to the signal circuit. If the fuel rail pressure sensor does not output the correct voltage verify the 5 volt reference is present at the sensor.