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Old 08-22-2019, 02:27 PM   #13 (permalink)
Ghostvette
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Join Date: Aug 2013
Location: Shawnee KS
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Quote:
Originally Posted by SonicVQ View Post
With all due respect:
The fault is an electrical issue (An improper VOLTAGE signal is sent to ECM through EVAP canister vent control valve.), so the gas cap has nothing to do with this fault.

The ECU monitors the voltage and current of its inputs and outputs to verify they are functioning properly.

On the 350z/370z (and G35/37) the vent value is a common failure. This is due to the valve being open all the time, except when the OBD evaporations monitor runs.

This allows dirt and water to find its way in and prevent the solenoid valve from make a 100% seal.
The important part is that OP needs the FSM and needs to follow the troubleshooting steps outlined there. What he may find is multiple problems, a gas tank that has been over-filled, damaging the valve, causing erroneous voltage to be sent to the ECU. He could also find a damaged gas cap. Hell, he might even find a mouse or squirrel has chewed through a wire...

Access to a CONSULT system or a very good scanner would help diagnose the problem. EVAP system faults are generally a pain in the backside to troubleshoot and resolve. Between vacuum lines, sensors, valves and wires, it's not an easy fix.

I suggested gas cap because of the large number of failures I'd see on non-Nissan cars; as repairs go, it's relatively inexpensive. OP didn't give us year and mileage, so some presumptions have to made. If he bought an 09 or 10, it's entirely possible the cap has been damaged at some point, which will cause some odd fault codes, including P0447. Just an observation from many years of working on cars and watching the complexity evolve... You almost need 10k in electronic test equipment to troubleshoot cars any more.
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