How common are ecu failures on 01-02 t4r

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xspsi6

New member
How common are abs/vsc ecu failures on 01-02 t4r

My speedo in inop and I replaced the cluster with a known good one so only thing left in line is the ecu as per the factory service manual as the wheel speed sensors send a signal to the cluster head then to the ecu which converts it to speed if I understand correctly?

I think this may be the only thing left in line.
 
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Sorry, you're not being clear in what your issue is and what you're doing there. If I understand correctly your speedo is off? If it is then I have the same issue on my 02. I haven't done anything to troubleshoot it yet. First in line for me is changing speed sensors since I have ABS issues as well.
 
Actually, on the '01-'02 the four wheel sensors send their signals to the VSC ECU located under the far left side of the dash and then a single speed signal is sent from there to the speedo in the cluster. Just to be clear, the ECU involved is the VSC ECU. Normally when people say just ECU, they mean engine control unit, which is not involved here.

Be aware that '01-'02 are different from other years as speedo setup goes due to the VSC. There are also two speed sensors on the trans, which send their signals to the engine ECU, but I don't know if those can affect the speedo.
 
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My Garmin shows a difference of 5km/h. Considering that the GPS is more precise I'm actually going slower than my speedo is telling me.
 
TheDurk said:
Actually, on the '01-'02 the four wheel sensors send their signals to the VSC ECU located under the far left side of the dash and then a single speed signal is sent from there to the speedo in the cluster. Just to be clear, the ECU involved is the VSC ECU. Normally when people say just ECU, they mean engine control unit, which is not involved here.

Be aware that '01-'02 are different from other years as speedo setup goes due to the VSC. There are also two speed sensors on the trans, which send their signals to the engine ECU, but I don't know if those can affect the speedo.
Click to expand...

Correct I should have been more specific I was referring to the abs/vsc ecu not the main ecu which is wher as I understand where my problem comes from as in no speedo or cruise and cel,abs,vsc,brake lights are all on
 
xspsi6 said:
Correct I should have been more specific I was referring to the abs/vsc ecu not the main ecu which is wher as I understand where my problem comes from as in no speedo or cruise and cel,abs,vsc,brake lights are all on
Click to expand...

So what are your DTC codes?
 
Aelfwine said:
My Garmin shows a difference of 5km/h. Considering that the GPS is more precise I'm actually going slower than my speedo is telling me.
Click to expand...


Bump N Run said:
Same here. So we really have more mileage on our vehicles than it states. :guitar3:
Click to expand...

Not really. Even though your speedo is off, your odometer is pretty accurate.

Picture of my Garmin vs. odometer on a long trip.

quby8evu.jpg
 
I was under the impression that is the efi ecu? There is a box on the bmc that looks like it could be an ecu of some sort.

In google searching this problem it seems to be semi common failure but nobody ever post back after it gets fixed.
 
TheDurk said:
Actually, on the '01-'02 the four wheel sensors send their signals to the VSC ECU located under the far left side of the dash and then a single speed signal is sent from there to the speedo in the cluster. Just to be clear, the ECU involved is the VSC ECU. Normally when people say just ECU, they mean engine control unit, which is not involved here.

Be aware that '01-'02 are different from other years as speedo setup goes due to the VSC. There are also two speed sensors on the trans, which send their signals to the engine ECU, but I don't know if those can affect the speedo.
Click to expand...

I just re read this thread and my question was answered already in this post so today I will pull the ecu and open it up to look for leaking caps or damaged circuts etc etc
 
xspsi6 said:
I was under the impression that is the efi ecu? There is a box on the bmc that looks like it could be an ecu of some sort.



In google searching this problem it seems to be semi common failure but nobody ever post back after it gets fixed.
Click to expand...


Anyway, thats where mine is located. It says right on it ABS/TRC/VSC. Make sure you're taking apart the right one before you do)))
 
Mine was on the lower drivers side foot well and I got it out and all looks fine visually but Thursday I have a co worker of my wife coming over with her 01 just like mine so I will swap hers in my truck to see if that were to take care of the problem and if so I priced a replacement at Toyota today and it was only 300ish our cost for a new one so I am hoping this does it!
 
Interested in how it turns out. Let me know if it works, most people forget after they solve the problem!)))
 
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