Fuel Tank Pressure Sensor Voltage

Cliff Diagnostician California Posted   Latest  
2000 Nissan Maxima GLE 3.0L (VQ30DE) 4-spd
Voltage Range

I have a question for the NIssan Guru's out there. I have this Maxima and have verified all of the solenoids will function manually for evap control. Unfortunately the vehicle has a full tank of fuel at this time and unable to do a road test to meet the criteria for the Evap monitor test drive. 

My question is what is the maximum variance allowed for the the Fuel Tank Pressure sensor voltage. All the specs I read are 3.34 Volts to 3.4 Volts with the system at atmospheric pressure. This vehicle sensor is at 3.06 Volts. I know for a fact that this variance would cause a fault on a Honda and Toyota but unable to find what the allowable variance is for a Nissan. 

Rick Educator

Cliff, First question, are you experiencing any issues with vehicle? What year Nissan? Next question, under what condition do you see this voltage KOEO or KOER? Last question, if you remove the hose from the sensor what is the reading? This will not set a code for tank pressure off by this amount. Keep in mind that this system also includes a fuel tank temperature sensor that must rise a

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Ray Diagnostician

You could close the vent sol, then energize the purge sol to create a vacuum in the tank to see what the pressure sensor voltage is under a vacuum. Then apply some pressure in the tank thru a smoke machine to see how high the pressure sensor voltage climbs to. If you scope the sensor over time, you could ck the signal for any glitches or drop outs.

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Cliff Diagnostician
Cliff Update

After many road tests verifying the system functioned as normal I installed a new FTP sensor. The new sensor voltage was 3.40 volts after installation with KOEO. I reset the light and have had the customer return after 2 weeks of driving, Evap monitor ran and passed. So the specification is apparently not + or - a percentage. Some reference material in the trouble shooting specs stated the

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