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Old 02-09-2021, 09:27 PM #61
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And all they would have done is tighten the gas cap.

For the price, I would have considered just replacing the gas cap. I will only use OEM Toyota parts in my 4runner, and thats why is runs so well and will last a long time.
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Old 02-10-2021, 12:02 AM #62
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+1 on the OEM parts and especially gas cap lol
Something about a $15 Napa cap dosnt sit well.
Changed my gas cap with OEM 2 years ago
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Old 02-10-2021, 12:52 AM #63
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The last time my check engine light went on, I called the dealership. The service manager told me over the phone to tighten my gas cap. Problem solved, and I didnt even have to drive to Wal-Mart and let them scam me out of $20.


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Old 02-10-2021, 10:20 AM #64
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Quote:
Originally Posted by duffdog View Post
Well, since you asked nicely: Toyota's anti-skid technology and skid computer depend on several variables to enable the correct functioning of the system. Note that both the engine control and skid control systems are integrated, meaning they cannot operate independently. If it is determined by the ECU that a harmful or out of specification condition exists regarding the emissions system, the computer (by federal law) must show the owner that an out of specification condition exists via a "check engine light". The MIL light indicates that an out of specification emissions condition is occurring and by default may alter or change the ignition timing, VVTI timing, spark clearance, throttle response or any combination of any of those parameters to mitigate the excess emissions of harmful or otherwise non-approved fumes, gases or particulate emissions from any of the federally mandated emissions systems. A side effect of the computer attempting to mitigate the excess emissions from a non-functioning system is a reduction in torque or power under high calculated loads. Due to the reduction in power from the engine, the skid computer (which uses engine power to operate), may have a different response to terrain irregularities than what was originally programmed by the firmware engineer who designed the skid control ECU's response patterns to tire-slip conditions. At this point, it is additionally required by federal law that if a vehicles anti-skid or anti-slip system is operating out of specification and may cause unintended and unexpected vehicle maneuvers which can possibly affect the stopping distance or rollover prevention mechanisms of the skid computer, a light is illuminated to indicate such a condition exists.

Any questions?
Explained very well DuffDog. Unfortunately, there are those that may not un understand and therefore discount the validity of the information. After a 43 year (just retired) career in electronics engineering, I have experienced this all too many times. "Watch Dog" code was always one of my favorite to work with.
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Old 02-10-2021, 11:05 AM #65
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Quote:
Originally Posted by duffdog View Post
Well, since you asked nicely: Toyota's anti-skid technology and skid computer depend on several variables to enable the correct functioning of the system. Note that both the engine control and skid control systems are integrated, meaning they cannot operate independently. If it is determined by the ECU that a harmful or out of specification condition exists regarding the emissions system, the computer (by federal law) must show the owner that an out of specification condition exists via a "check engine light". The MIL light indicates that an out of specification emissions condition is occurring and by default may alter or change the ignition timing, VVTI timing, spark clearance, throttle response or any combination of any of those parameters to mitigate the excess emissions of harmful or otherwise non-approved fumes, gases or particulate emissions from any of the federally mandated emissions systems. A side effect of the computer attempting to mitigate the excess emissions from a non-functioning system is a reduction in torque or power under high calculated loads. Due to the reduction in power from the engine, the skid computer (which uses engine power to operate), may have a different response to terrain irregularities than what was originally programmed by the firmware engineer who designed the skid control ECU's response patterns to tire-slip conditions. At this point, it is additionally required by federal law that if a vehicles anti-skid or anti-slip system is operating out of specification and may cause unintended and unexpected vehicle maneuvers which can possibly affect the stopping distance or rollover prevention mechanisms of the skid computer, a light is illuminated to indicate such a condition exists.

Any questions?
THIS^^^^^^^^^^^^^^^^^^^^

I was going to post this myself, but it would have been in my own words and not nearly as thorough or eloquent. This is why the additional lights come on when there is a fault in the emissions system. I'm not crazy about it myself but it does that for a legitimate reason.... not a scam.
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Old 02-10-2021, 11:31 AM #66
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To the OP: You're entitled to your opinion, however, the anti skid and traction control lights come on along with the CEL because they feel that those systems can't adequately do their jobs while there is another fault occurring in the engine management system. Furthermore, Toyota is the most reputable manufacturer there is. When they find a problem with their vehicles they recall and fix them when others would just say it's not their fault. They've done several recalls on engines sludging up when in fact if the owners had done proper maintenance it never would have happened. They had a recall on the dashes of some models because they become sticky after time. Toyota has built their reputation as the most reliable vehicle manufacturer and they aren't about to scam anybody just so their dealerships can make a few extra bucks. Dealership service departments are a part of independently owned dealerships. Other than selling a few parts, having people bring their cars in for malfunction lights does nothing for Toyota Corporate. You think they would risk their reputation to help their dealer owners?
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Old 02-11-2021, 10:17 AM #67
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This was the best thing Ive read in a while!! I love all the thoughtful accurate answers to his question that make 100% sense bc machines these days have a cpu that has to communicate with each other and his response was just to cry foul. I think his cpu is a nuero-net processor, a (non)learning computer.
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Old 02-11-2021, 01:13 PM #68
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Least you can diagnose witht the scanner.
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Old 02-14-2021, 09:43 PM #69
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This was fantastic!! There appears to be both lowest common denominator and a much higher uncommon denominator at work here. Logic and facts, some people love them and understand, some people will always just kind of be drooling and looking around vacantly...

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Old 02-14-2021, 11:28 PM #70
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Quote:
Originally Posted by Drcoffee View Post
You may have cleared the code, but the system runs checks when the car is off. It might be days before the code returns. Dont pat yourself on the back just yet.
Hopefully your problem is resolved with just the cap fix but note this response as I seen this before also.

Problem might pop up again later at which point maybe you will feel better about going to dealer. There could be an emission related issue
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Old 02-14-2021, 11:41 PM #71
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This has to be a joke right?! No way the OP is serious...I hope!
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Old 02-16-2021, 01:20 PM #72
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I guess nobody has mentioned that the check engine light will usually pop some combination of "trac off"/4wd/"vsc off" light or (depends on the model and trim level) whenever it comes on. It doesn't necessarily mean that there is a problem with that particular system, rather it is disabled whenever the check engine light comes on. Any shop worth their salt will know this and address the check engine light. It is not a scam. It is just the way the logic in the ECU is designed. Most Toyota models are similar in that multiple lights usually accompany the check engine light.
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Old 02-16-2021, 02:12 PM #73
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I feel this is a total trolling thread, but why the hell not....

A diagnostic trouble code doesn't tell you what to fix. It lets you know that the ecm has detected a fault, and the code narrows it down to the specific system. A cheap handheld scan tool is suggesting what to fix based on the odds.


Here's a picture of some info for P0445..EVAP large leak detected. Gas cap is first on the list, but there are other things to check as well. Gas cap is just the most simple thing to check, and because it gets removed/replaced often, a likely candidate to fix in order to turn off the cel.
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Old 02-16-2021, 02:27 PM #74
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Aaaaaand....since I'm on a roll....if you are curious about the EVAP I/M monitor, here are the requirements for it to run. Where step c(1) mentions "Connect the Techstream to the DLC3, you can get a scan tool that shows all the I/M monitor status. This will show pass/fail/incomplete


3. EVAP SYSTEM MONITOR (KEY OFF TYPE)

(a) Preconditions

The monitor will not run unless:

The fuel tank is less than 90% full.
The altitude is less than 8000 ft (2450 m).
The vehicle is stationary.
The engine coolant temperature is between 4.4 and 35C (40 and 95F).
The intake air temperature is between 4.4 and 35C (40 and 95F).
Vehicle was driven in an urban area (or on a free-way) for 10 minutes or more.

(b) Monitor Conditions
(1) Turn the ignition switch OFF and wait for 6 hours.
HINT: Do not start the engine until checking Readiness Monitor status. If the engine is started, the step described above must be repeated.

(c) Monitor Status
(1) Connect the Techstream to the DLC3.
(2) Turn the ignition switch ON.
(3) Turn the tester or scan tool ON.
(4) Check the Readiness Monitor status displayed on the tester or scan tool.

If the status does not switch to Complete, restart the engine, make sure that the preconditions have been met, and then perform the Monitor Conditions again.
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Old 02-16-2021, 03:26 PM #75
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Quote:
Originally Posted by cooper30 View Post
Aaaaaand....since I'm on a roll....if you are curious about the EVAP I/M monitor, here are the requirements for it to run. Where step c(1) mentions "Connect the Techstream to the DLC3, you can get a scan tool that shows all the I/M monitor status. This will show pass/fail/incomplete


3. EVAP SYSTEM MONITOR (KEY OFF TYPE)

(a) Preconditions

The monitor will not run unless:

The fuel tank is less than 90% full.
The altitude is less than 8000 ft (2450 m).
The vehicle is stationary.
The engine coolant temperature is between 4.4 and 35C (40 and 95F).
The intake air temperature is between 4.4 and 35C (40 and 95F).
Vehicle was driven in an urban area (or on a free-way) for 10 minutes or more.

(b) Monitor Conditions
(1) Turn the ignition switch OFF and wait for 6 hours.
HINT: Do not start the engine until checking Readiness Monitor status. If the engine is started, the step described above must be repeated.

(c) Monitor Status
(1) Connect the Techstream to the DLC3.
(2) Turn the ignition switch ON.
(3) Turn the tester or scan tool ON.
(4) Check the Readiness Monitor status displayed on the tester or scan tool.

If the status does not switch to Complete, restart the engine, make sure that the preconditions have been met, and then perform the Monitor Conditions again.


Nooooo!!! This is too much data.. It's obviously a scam! A grand conspiracy, even!
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