1998 V70 no acceleration under load, idles great

[milliniumvolcan]

update.... got the code reader... and the winner is................

p0500 a

my abs light is on.... put it is saying its a wheel speed sensor... question is... which one.... both or is it the main abs module?

[theWIFES_S70]

Woah!

Looks like the culprit (from the thread below) is most likely your ABS module.
viewtopic.php?t=17210

And your ABS light is on? Looks like you might have to pop off that ABS module and ship it to Matty Moo at Midwest ABS. https://www.midwest-abs.com/ A lot of us on here have shipped our ABS modules to him for repair. You could try removing it and reseating it. But it probably needs to be repaired. You could also try to DIY it if you're daring...

Looks like you've almost got this squared away.

[milliniumvolcan]

then the next thing i have ..... i was watching a video and it says that if you send off your abs module for repair you can still drive the car just don't slam on brakes or anything..... so if you can remove the module and drive normally.... then how could THIS be the problem?....

it seems like its stuck in limp mode... is there a test for the tcm? to see if the problem lies there?

[milliniumvolcan]

i went outside.... completely disconnected the abs.... and no change.... my next check off the block is flush the trans..... after that i'm a lil lost...... the video on the abs module... said yes you can disconnect your module.... drive.. and all would be fine.. except your speedo won't work... so i did that and yes .... no speedo but the issue was stiiiiiiiiiiill there... i did see something about s1 and st sensors..... what are those?

perpetual limp mode.... grrrrrrrrrr

[milliniumvolcan]

that link has the blinking up arrow..... but mine doesn't have that now.... since i fixed the pnp... no blinking up arrow.... the only thing i have is the lack of power.... thats why i'm confused.. no blinking arrow.... someone said something about a wheel ring?... speed ring?... near the cv joints so the sensors could read it...

[theWIFES_S70]

I don't know about driving without the ABS module. I never read that, don't think I would do that.

Speed sensor stuff looks confusing. I suppose you could check the resistance and continuity of each sensor to see which one might be bad. (Though, I wouldn't know when they'd be powered or not...)

https://www.fcpeuro.com/Volvo-parts/S70 ... d%20sensor Much cheaper on ebay...

In that link I posted last, someone fixed a similar problem by replacing the speed sensor that goes into the transmission.... Don't know what the code would be for either one of the speed sensors.

[milliniumvolcan]

check out this guys you tube video... i get a lot of good info from him... this is where i got driving with the abs unpluged idea from ......

[abscate]

You need a good reader that can read the ABS codes and report where the bad signal is.

You can drive without the module in place, systems fail safe of course