Quote:
|
Originally Posted by imaddicted2u Well the code - P0440 - Evaporative Emission (EVAP) System - came back. I pulled the plug on the EVAP solenoid and got another code regarding the loss of the coil. I plugged it back in and that code moved to history. I have vacuum in to the solenoid and vacuum at the schrader valve test port. What else could be wrong. it appears as though the solenoid is good. Also a while after this code comes up I'm told to check the gas cap. |
Checking the gas cap is a good test. If it's bad or loose, the pressure in the tank will not be what it's expecting and that will set the code.
Presence of vacuum doesn't necessarily indicate the solenoid is good. It's possible it should be blocking vacuum but the solenoid isn't responding properly. I've had to take them out and test them with a 12VDC source. If it's getting 12VDC and it doesn't click, the solenoid is bad. The code might just be telling you that the circuit is open. The circuit might not be open if the solenoid is intact but not working properly because it's stuck. When I've replaced those things, they've been rusty and just stuck in one position. There may also be more than one solenoid to check. Where was the one you disconnected? Which code came up when you did that?
