Now that we have a good understanding of the EVAP system on this 2010 Toyota Corolla, what is the actual REPAIR to get rid of the P0441 and P0455 codes?
We MUST get the monitors to run before returning the car to the customer!
What is the MORAL OF THE STORY?
THINKTOOL PROS:
https://www.amazon.com/dp/B08XXWHQVJ?tag=onamzpineholl-20&linkCode=ssc&creativeASIN=B08XXWHQVJ&asc_item-id=amzn1.ideas.NHZL00NIDEPF
Enjoy!
Ivan
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I suppose that good diagnostics should/could start with checking over the car to find and refit any OEM electrical component parts found in the car one by one to see if the problem resolves :]
As you say, ivan, in this video – OEM only for electrical components with no 'ifs or buts'.
Mr Ivan, can you share a Rockauto discount code, Please?
How do you account for video time when diagnostics are performed?
Excellent series with some very valuable lessons! The tongue in cheek saying of “$250/hr if you worked on it first” isn’t all that far off from the truth. I also preach OEM only for anything with an electrical connector.
I recently had a similar situation on an ‘09 Yukon where an aftermarket set of 8 brand new Denso injectors (installed by the customer) had wildly mismatched flow rates and kept setting misfire codes. The customer had also replaced the battery, throttle body, plugs, coils, and cats. The original injectors were discarded so a new set of 8 ACDelcos fixed the truck up albeit for a pretty penny.
toyota is not as high quality as it used to be
this is one case that I would have black taped the stinkin money light LOL
I'm glad I'm not the only one who finds Scotty Kilmer completely annoying.
I wouldn't be surprised if the driver in the ECM failed because of it being "checked" inaccurately (maybe shorted/jumped) creating a different problem but another part in the parts cannon fixed the original problem.
Exceptionally well done Ivan, and a great deal of work. I think you probably spent a little more than 3 hours, so that is very fair for a labor charge.
For future reference, the Purge VSV should be pulsed at a period of 100mS, with a duty cycle of 90% at idle, after 10 minutes of idle. That leaves a low time of 10mS, or on (low) 10% of the time, every 100mS. This is according to the 2010 Toyota Corolla OEM (Toyota) service manual, Volume 1. I do not know how long this pattern runs.
I cannot tell for sure if the ThinkTool PROS is pulsing the Purge VSV on (low) long enough. It is hard to see the Div (vertical) lines in order to see what the on time is. It should be on (low) at least 10mS every 100mS. The best I can tell, it is on about 6.5mS every 65mS, approximately. If so, this may or may not be long enough to do the proper purge. It is on for a shorter period of time, but turns on more often (roughly 2 times (for 6.5mS) every 130mS versus 1 time (for 10mS) every 100mS). If it works, using this same test on the ThinkTool PROS with the OEM Purge valve, the only explanation I can come up with is the OEM part opens up farther when fully opened than the after market part, or this pattern goes on for a longer period of time. Now, of course this is with the vehicle running at idle, and this could change at higher RPMs, and I don't have any information on that.
A rough calculation is the specification says 10mS every 100mS, the ThinkTool PROS pulses it 6.5mS every 130mS. This works out to the specification has the valve on (open) 100mS every second, and the ThinkTool PROS has the valve on (open) 50mS every second. If these calculations are correct, the ThinkTool PROS would have to run this pattern twice as long to have the valve open for the same amount of time. If it fully purges is greatly dependent on how long this pattern (or any similar pattern) is run.
Please note that this applies to models ZRE142, and AZE141. I do not know what model this is, so cannot say for sure if this specification would apply to this vehicle or not. I think it does, but i don't know for sure.
Again, Ivan, a great job doing what those before you could not. And, thank you for putting in the extra work to film this for everyone.
Omegaman
I suspect somebody shorted out that purge valve circuit or the purge valve shorted out at one time. That Toyota purge may be a replacement from Toyota and the original failed purge is long gone. I'd bet money that driver didn't just fail on its own.
Great job ! BTW – I've often had nothing but trouble with aftermarket electrical parts in Toyota's…. they don't seem to play well together. So yes, I would agree that's it's best to always stick with the OEM part.
I suspect previous owner may have fried the ecm driver when trying to fix a “simple” evap code which then led to the parts cannon.
I wonder if the problem was originally in the wiring harness and the original owner blew the driver by, at first, miswiring the repair. Still, it would be interesting to see the schematic of the driver circuit. How does a blown transistor to ground cause the output to hold steady at 6V? Seems to me that a transistor will either blow open or short, 12V or ground respectively.
The driver may have failed from the previous owner's hack wiring job. But yes toyotas do break. My dad had a Tacoma pre runner that needed repairs that you wouldn't normally have to do to a domestic car. At less than 50K too. And dont forget about the death trap toyotas that would run away with unintended acceleration. I lost a good friend along with her 2 young kids b/c her camry darted into a busy intersection.
drill a hole in the gas cap?
I think comparing the dc current for the solenoids is not a good comparison since that's not the default operating state, could be failed flyback diode or something that was allowing the voltage spike from the collapsing magnetic field to cook the driver circuit. Best regards,
That LDP system is very finicky, like the Chryslers were/are. Having that time table is nice but I wished they would've also had a numbers chart so that you could see known good voltages and PSI/HG values to eliminate what is 'normal' vs raw scan tool data. Also bear in mind the refresh rate on your tool is not as fast as what the ECM sees, and with these systems, it's all about TIME! Nice diag! I'll bet it took you longer than 3 hrs charged..