StrikerHA

i have code 0704 from ecu, did some trouble shooting and found the evap system pressure sensor is not working correctly, i need to order this part but i dont know the part number, can anyone help? thanx

eng92

iTrader: (3)

Call up your local dealer. Give them the make model and year of your vehicle. Some of them even ask for the VIN. They will give you the p/n and a ridiculous price to go along with it.

StrikerHA

haha alright, i tried that, but they said they cant order the part cuz it could be any number of sensors, does anyone know which one it is?

eng92

iTrader: (3)

I have FSMs for both 96 and 98. There is only one pressure sensor in the EVAP circuit.
I believe when they told you "it could be any number of sensors", they meant that other components in the evap system can malfunction and cause the P0450 (0704) code. Other possibilities are: vent control valve stuck open or an open (or short) in the harness or connectors.

In your first post, you said you went through the diagnostic procedure and determined that the pressure sensor itself was the culprit. If you have not already done this, you can use a hand vacuum/pressure pump and a voltmeter to check the sensor directly.