Question about 2004 Toyota Sienna

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I have a 2004 Toyota Sienna, and am having problems with the vehicle skid control system. It seems to kick in without any reason for it. I wanted to check the fuses that might control it, and checked #38 ECU-IG 10A, and #45, Stop 10 A, and they are fine. I wanted to check #64, ABS1 50 A, and #65, ABS2 30 A, but fuses 56 to 66 are not in the engine compartment fuse box where they are supposed to be, according to my owner's manual. Does anyone know where they might be? I think they must be elsewhere because #60 R-PSD 30 A controls the right side power sliding door and it's working.

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Hello. Welcome to FixYa. Please allow us to assist you.

We are sorry that you are having a problem with your Sienna, hopefully, we can sort this out for you.

When you are saying that the skid control system 'kicks in' without any reason, we would doubt that you have a fuse issue. Since it is 'kicking in', the system is apparently properly powered up.

More than likely, you may have an issue with the wheel speed sensors, one sensor is on the hub of each wheel, for RPM measurement. If the sensor is bad, or otherwise weak or compromised with rust, dirt, mud, etc, the RPM signal will not be true; the vehicle will respond in the fashion that it is designed to, whenever the RPMs are markedly different. The system will engage when a RPM imbalance is detected. Another possibility may ba the 'counter gear' that the RPM sensor uses to calculate the RPM of the wheels. If the counter gear is compromised, cracked, or otherwise damaged, the RPM sensor does not transmit the actual RPM to the system's control unit.

What we suggest:
Take the vehicle to a qualified technician, one that possesses a scan tool that can do a real-time readout of each wheel's RPM during a road test. That info, when an RPM imbalance is detected, will lead the technician to the correct place to start his diagnosis. Without the RPM figures, it will be hard to properly diagnose the issue.

Worth mentioning; and this too could easily be a possibility:
If you have tires fitted, that are different sizes, front and rear, ie one worn tire and 3 good ones, this phenomonen can also happen. Take care to ensure that you have all 4 tires that match perfectly. Same size, same manufacturer, same model. Just because the tires say 265-75-15 on them does not mean that a Goodyear tire is exactly the same as a Bridgestone tire. Different tire circumfrences will creeate different RPM readings.

Thanks for choosing FixYa for assistance today. If you need any further assistance, please feel free to post back to me. Have a great day.

Posted on Nov 06, 2010

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I did all that and nothing worked. New tires. Disconnecting this and that. After wheel bearing replaced and hub. Problem seemed to have gone away.

Posted on Jan 27, 2015


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