P2418 C1201 (1 Viewer)

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MuseChaser

MuseChaser

Joined
Jul 22, 2018
Threads
10
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204
Location
Central NYS
Hey, all.. OK, the honeymoon's over.. put about 1300 trouble-free miles on our new-to-us '05 LX470 which now has 136,700 miles on it, and she threw her first errors today. Today was extremely hot and humid.

Went for a grocery-get, and the check engine light, VSC OFF, and VSC TRAC lights came on and stayed on. Drove a total of about 40 miles, turning the car off twice and restarting at various destinations, lights stayed on.

Read codes when I got home. P2418 says Evap Emissions Switching Valve Control Circuit Open, and the current, pend, and hist boxes are all checked. C1201 gives very little details, but it's in the ABS/VSC system and only the curr box is checked. Online searches have made it sound like C1201 is a failsafe mode that turns off the VSC until the engine control issue (P2418?) is solved. Further playing around yielded more detail ion the evap system, with everything passing except for "Gross Leak," with a value of -127.080 kPa, and the acceptable minimum was listed as -127.002 kPa.

Sooo... what's next? Replace the switching valve? If so.. where is it? I've looked at parts diagrams, but don't know where in the car those pics are... umm.. picturing?

Thanks.. as always, any help is greatly appreciated.
 
An update on this issue..

After clearing the codes, they reappeared after another few weeks and a couple hundred miles; same P2418 for evap vsv open. Poured over another couple threads here I found about the issue, along with the FSM, and found the evap VSV (bolted on the manifold under the plastic engine cover) and the CCV VSV (attached to driver's side fender inside engine bay). Pulled them both just for good measure and checked them per FSM. The FSM I have refers to SF-48 for the CCV and SF-44 for the evap VSV, but I'm missing page SF-44; I paged through it a million times (OK, maybe 10) and all the others are present. Can anyone post or send me a copy of SF-44 without too much trouble?

Is the test procedure for the evap VSV the same, i.e., continuity across terminals w/ about 30 ohms resistance, no continuity between terminals and ground. and no or very restricted air flow when voltage is applied? I believe my VSVs check out OK; the evap vsv has continuity across the terminals, no continuity from either terminal to housing/ground, I hear a distinct click when applying 12v, but I am not sure about changes in air flow... I'll run it again today just for kicks, but would love to know exactly how the valve is supposed to work. There is 12v present at the plug from the harness with the engine running. In what conditions should that voltage NOT be present? What else could cause that code? Haven't checked the VSV mounted on or near the charcoal canister, nor run any of the tests on the canister itself... lack of vacuum/pressure tools/gauges.

Thanks for any further input...
 
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Still poring over this.. in the evap diagnostics portion of the fsm, it states "Check the vacuum at idle - Vacuum:Maintain at 0.368 - 19.713 in.Hg (5 - 268 in.Aq) for over 5 seconds." That makes no sense to me. That's a pretty huge range.. maintain WHAT?.. any number within that range? Seems pretty unspecific. Should the vac rise from bottom to top, or fall from top to bottom? Remain constant at an unspecified number within that huge range?
Yeah, I'm new to this stuff. Any added clarity would be GREAT.. thanks. Can anyone recommend a handpump pressure/vac gauge with a in.aq scale? Can't find anything like that on Amazon, but like the Sting song says, it's probably me.
 
Bump...?
A little surprised no one has replied. Any advice would be great, including things I may have done poorly out of ignorance..bad thread title? Issue of little or no interest to others? Too specific?
 
If you have access to techstream with mini vci you can run tests on the Evap system including each monitored component. That is an easy effective way to sus out working or failed valves or sensors. Also check for cracks and vacuum leaks in hoses.

You can test each valve independently using the instructions innthe Diagnostic portion of the FSM- section DI
 
Thanks, abuck99. The FSM manual I have is missing page SF-44, which is the page that details the test procedure for the evap vsv, but I followed the steps for the ccv vsv on page SF-47/48 (I think). I do have Techstream, and that's how I read the codes and found that the evap VSV is reporting an open condition. I've been attempting to follow the diagnostics in the fsm as you suggested, but as I wrote in the third post of this thread, some of it doesn't make any sense to me and I can't find the right vac/pressure pump/gauge that'll read in.aq. Can you tell me if the evap vsv is supposed to test the same way as the ccv vsv, i.e., continuity between terminals, no continuity between terminals and ground/housing, air flow when no voltage, little or no airflow when voltage is applied?

Again, thanks for jumping in.. much appreciated.
 
This may seem like an all too easy thing to check, but have you tried replacing the gas cap? I had all lights come on a few years back at close to the mileage you have and it ended up being the seal on the cap was old and dry – had my mechanic clear code and replaced cap and all was good.
 
I can't answer your last question, I haven't tried it. I know that DI chapter explains in detail how to check each component with Ohm meter.

Check you inbox for SF-44
 
@MuseChaser - curious if your solved the problem? I just bought a 2004 LC with the same code,

Kevin

MuseChaser said:
Thanks, abuck99. The FSM manual I have is missing page SF-44, which is the page that details the test procedure for the evap vsv, but I followed the steps for the ccv vsv on page SF-47/48 (I think). I do have Techstream, and that's how I read the codes and found that the evap VSV is reporting an open condition. I've been attempting to follow the diagnostics in the fsm as you suggested, but as I wrote in the third post of this thread, some of it doesn't make any sense to me and I can't find the right vac/pressure pump/gauge that'll read in.aq. Can you tell me if the evap vsv is supposed to test the same way as the ccv vsv, i.e., continuity between terminals, no continuity between terminals and ground/housing, air flow when no voltage, little or no airflow when voltage is applied?

Again, thanks for jumping in.. much appreciated.
Click to expand...
 
kevin2i said:
@MuseChaser - curious if your solved the problem? I just bought a 2004 LC with the same code,

Kevin
Click to expand...
Ok, I checked all the VSV’s - the one on the charcoal canister was stuck open. I sprayed it with WD40, tapped it a few times and got it working. The FSM is not clear, but the picture shows it should be open only when energized. Note I can’t locate the part, but it is easy to remove from the canister and should be interchangeable with vsc #1 on the manifold. (2004). My 1998 has a slightly different layout.
Screen Shot 2021-02-02 at 2.42.03 PM.png
 
kevin2i said:
Ok, I checked all the VSV’s - the one on the charcoal canister was stuck open. I sprayed it with WD40, tapped it a few times and got it working. The FSM is not clear, but the picture shows it should be open only when energized. Note I can’t locate the part, but it is easy to remove from the canister and should be interchangeable with vsc #1 on the manifold. (2004). My 1998 has a slightly different layout.View attachment 2573531
Click to expand...
@kevin2i: how inn the world did you remove the valve at the canister from the canister frame? I inspected the part and looked at pictures of the part from Partsouq and that sucker seems to be built into the assembly? At least on my '05. I would love to replace that valve without replacing the whole assembly. Anyone done that?
 
Bump.... my 2004 LX w/145k just got VSC TRAC, VSC OFF, ENGINE lights on.

TechStream P2418 C1201 codes.

I have tried a new gas cap. Is there a consensus on the fix?

I just switched from dino to synthetic oil 200 miles ago.
 
Replaced the Valve Assembly (Purge valve VSV) part# 25860-50100. Codes P2418 C1201 have not returned in the past 4 months though the Cruiser has only been driven 1000 miles since.

1647212875452.png
 
9 months and 1100 miles later... and the codes P2418 C1201 are back... :confused:
 
Couvi said:
This may seem like an all too easy thing to check, but have you tried replacing the gas cap? I had all lights come on a few years back at close to the mileage you have and it ended up being the seal on the cap was old and dry – had my mechanic clear code and replaced cap and all was good.
Click to expand...
Had the same issue. Spent a bit of time chasing a phantom gremlin. Then purchased an oem gas cap. Zero issues
 
HatfieldAr said:
Had the same issue. Spent a bit of time chasing a phantom gremlin. Then purchased an oem gas cap. Zero issues
Click to expand...
Have a new OEM gas cap already installed.


Going to try to replace this part next. Can anyone provide the part number?

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