Ok well I have a purge valve code popping

PO443 and PO446

We tested the voltage and we're only getting .4 volts from the ecm to the purge valve. Are we testing the right spot? We checked the wires and everything is connected and there's no breaks in them....any help would be nice. Do I need a new ecm?

 

Lemme look er up....

 

Is this your Saturn? Or something else you're driving?

 

My Ion....what else? Lol I want seem to drive it for more than a few weeks without something new.

 

2007 ion 3/w 2.4 or 2.2/engine. ?

 

Last I knew, it was off the road for transmission trouble, my bad...

Highly unlikely you need a new PCM, isn't there a solenoid for the purge valve?

Hey, I'll trade you my redline for it, lol... No new problems, just the same s%*t coming up over and over..,

 

3 w/ 2.2

 

P0443 Evap Emission Control System -- Purge Control Valve Circuit

The Evaporative Emissions System (EVAP) allows fumes from the gas tank to enter the engine to be burned, rather than vented into the atmosphere as an emission. The purge valve solenoid is supplied switched battery voltage. The ECM controls the valve by operating the ground circuit, opening the purge valve at specific times allowing these gasses to enter the engine. The ECM monitors the ground circuit as well, watching for faults. When the purge solenoid isn't activated, the ECM should see a high voltage on the ground circuit. When the solenoid is activated, the ECM should see the ground voltage pulled low, close to zero. If the ECM doesn't see these expected voltages, or senses an open in the circuit, this code is set.


P0446 Evap Emission Control System -- Vent Control Valve Circuit

Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, an open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.

For these both to set at the same time, it's electrical in my opinion.
Now to find the gremlin.

I do not have a wiring diagram but I would not at all be surprised if both solenoids of the evap system get their power through the same fuse.
So I would look through the owner's manual to figure out which fuse that is. It's likely toasted. Anything else not work on the car?

You can check if the above is true by pulling the electrical harness off both the purge solenoid and the vent solenoid,and finding which one measures 12V DC to a ground (NOT across the connector).

My guess is neither.

I think it's an open circuit issue where neither device is getting the required 12V potential it needs.

Assuming it is the fuse, when you replace it, either it will blow instantly when you start the car or it will be fine.
If it blows right away, I would suspect a short of the 12V wire to ground. Remember, if it is feeding both devices, only one need short to ground to blow the fuse.
If it does not blow at all, clear the codes n see if they come back.
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That's my SWAG with no documentation, diagrams, or meters -- and I'm sticking to it until....idk,.....