Can someone advise more information on the Throttle Control Module?

What is its function?

Where is it located?

Is it an electro-mechanical device? i.e. have a mechanical flap or some-such that I can clean and it will be restored to normal operating condition?

Is it possible that the electrical connectors on the device are a bit corroded after 5 years of life and can be cleaned and re-connected and the device will be restored to normal operation?

Thanks,

Tommy H.

Tommy, beginning with '99 model year, volvos came with an electronic throttle system (ETS).

What this means, is that there is no cable to operate the throttle plate, the throttle is controlled electronically by a computer module.

The problem with this setup, is that the module is part of the throttle body itself and has a high failure rate in '99-'00 year models. The unit is expensive, about $700 part at the dealer, requires software download and add labor to it and you're looking at a $1100-$1200 repair bill.

Cleaning it helps in some cases, but its temporary as the ETS module eventually fails and leaves you stranded. Scary thing is when it fails on the highway when you're going 75 mph.
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'88 240, '92 745, '98 v70 John, Tampa Bay

Your price for replacement seems quite steep. I had mine replaced for less than $800 and this included the price for the part, labor and the software download at a reputable Volvo dealership.

What happened when the 2001 production line was built? A new TCM?

The ETS module supplier, I believe, was changed with the '02 models.

The worst years are '99 and '00. The '01 modules don't fail as often, but they still fail. So

if you're looking for a newer used volvo, the '02 or neweris your best bet. A '99 or '00 only with an extended warranty.
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'88 240, '92 745, '98 v70 John, Tampa Bay

FWIW...

I have a 2001 S80 2.9 and had to have my ETM replaced at 46K miles. Fortunately it was done under warranty. My car is a fairly early 2001 model as it had a delivery date of 3/01.

Gordon
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2001 S80 2.9, 67K miles

I don't believe there ever was a problem with ETMs. The ABS module caused error messages that triggered the ETM message. Once the ABS is corrected, (Look on ebay for repair options less than $100) the other messages may clear. The more common problem with the fuel system is the wire on the Air Mass Sensor. Try these steps first. You may save.

GR