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Fuel Tank Pressure Sensor Quick-Fix

The 3 wire fuel tank pressure sensor, is connected to the fuel tank by a hose, and to the ECM. The ECM uses this value to run the EVAP monitor. This sensor has no bearing on how the engine runs. Here are the facts about the fuel tank pressure sensor:

1) The fuel tank pressure sensor is a 0 to 5 volt sensor.
2) You should NOT see a stuck on 0 or 5 volt signal value, using a scanner or volt meter. It has to be somewhere in between.
3) If sensor's stuck at 0 volts, then the 5 volt wire is broken.
4) If sensor's stuck at 5 volts, then the ground wire is broken, between the connector and ECM side.
5) You can jump either the sensor ground or 5 volts to signal and it won't hurt the ECM.
6) If you're stuck at either 0 or 5 volts, disconnect the sensor, and suddenly you have voltage at the signal wire, then the wiring is fine. Replace the sensor, or check tank pressure.
7) To test, connect a voltmeter to the signal wire, disconnect tak pressure sensor, jump sensor ground to signal, then also jump sensor 5 volt reference to signal. Do this at the sensor connector. You should see 0 and 5 volts respectively. That proves the ECM and wiring. It also proves that the fuel tank pressure sensor is faulty, replace the sensor.

Finally, if your sensor value is stuck somehwere else between 0 and 5 volts, make sure you're not building too much pressure nside the tank due to a faulty fuel cap, or EVAP vent valve. That's it for the Fuel Tank Pressure Sensor Quick-Fix.

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