Hey everyone. I keep getting this code that lights my check engine light. I replaced the purge valve and the purge solenoid but it still comes on. When I start the truck it pops up, but if I turn the truck off and clear the code it will not come on when I start it back up and it will stay off until the next time I start it. Runs great and there are no other codes or problems.
It seems like it only throws the code when it starts not while it's running. Like I stated before I change the parts that the code references but still no good. Anyone have a place where I can start or has this happened to anyone before.
Thanks all in advance for your help!

 

Is there anyone..... out there.......

Well I changed all the hoses from the intake to the solenoid, valve and canister. i checked all the hoses from the canister back to the tank and all seems good. Code is still there. My scanner still brings up 1445 after a few starts.

 

1445 and P0445 are not for a flow problem, they are for an electrical fault. Since you have already replaced the flow sensor itself, you should look at the wires and electrical connections to the flow sensor. The codes are for a high input to the PCM, so I would take a real close look at the black/white ground wire and the ground point. It should be on the radiator support near the purge flow sensor.

 

The ground is intact at the sensor and at it's end point, but I didn't have time to open up the wire loom to checkt the grounds. Can I run a new ground from the sensor to a grounding point to take care of the problem or to atleast see if that is the problem?
The vacuum makes it to the purge valve but the valve I believe is not getting the signal from the sensor to open, so nothing is being vacuumed back into the intake.

Thanks for the advice!

 

P1445 is an electrical fault in the Purge Flow Sensor circuit and P0445 is an electrical fault in the Purge Control Valve circuit. These are not for flow problems or control problems.

The electrical values from these circuits as measured at the PCM are outside of what either one should ever show. Did you have to splice any wires when you replaced the PFS or was it done plug and play? Is the harness pinched or chafed? Is there any water or corrosion in the connector?

If that stuff looks OK, open the large 42-pin connector that joins the engine harness to the engine bay harness, then the 104-pin connector at the PCM. Again look for problems like corrossion or water inside.

 

It was a complete plug and play and I inspected and found no water or corrosion in the connectors or any pinched wires. The PCM connection looked fine also. Where would the 42 pin harness be?

I ran the codes again and it is just 1445. So I asume it is just a problem with the sensor wiring not the valve wiring. I will start tracing wires. I found that the Blk/Wht is the ground, Blk/Lt Grn goes to pin 11 on the pcm and the Red splices into another red that goes to the valve, other parts and back to the PCM power module.

 

Big squarish connector on the DS of the engine. Like I said, it connects the engine harness to the engine bay harness. Can't miss it.

 

I know exactly what you mean. It sits practically next to my pcv valve. I noticed last night that it is not I could wiggle the top of this. It doesn't come apart or anything it just feels loose. This will be the first thing I check tonight before I rip into the wiring looms.

 

The harnass checked out ok. I cleaned it up just to be safe. I also started tracing the ground wires. the ground splits into 2 with 1 going to the radiator support and 1 going to the PCM power relay in the Power distribution box under the hood. Both were fine with all insulation still intact and no kinls or anything like that. I am probably going to have to take it somewhere if I can't figure this out this weekend even though I hope I get some more ideas on here.

 

Disconnect your purge flow sensor and make sure it is not hot let it cool down then if you have a dvom check the resistance across the sensor should be between 40 and 230 ohms if not the sensor is junk. I know you replaced it but could be a bad one. If that checks out and all your wiring is good you could have a bad pcm let me know what you get and ill try and help you diag the pcm if thats the problem.

 

Thanks. I'll be testing the sensor tonight and taking a look at all the wiring this weekend. I'll post back with whatever info I get.

 

.........code 445 and two zig zags, baby that all we need. we can go to the park after dark........................

 

My sensor is in good working order and all the wires checked out.

 

If you have traced the wires using an ohmmeter, and measured between them for shorts, then you're running out of good news. You're getting into bad PCM territory.

Did you in fact use an ohmmeter to check all the wiring? From PCM pin to sensor pin?

 

Yep

 

Well, you've eliminated most of what it could be. Not too much left. If your tests have been thorough, you're probably looking at a new PCM.

 

+1

 

I was thinking the same thing. I was figuring on just keep driving it with the light on and double check every once in a while for any new codes. Will this affect anything besides for the emissions?