Volvo 98 S70 ABS & TRACS lights are on

Thank you for all information already read about this subject. But I
still have a questions

When these two lights (abs & tracs) come on always after the abs
automated test, why it must be the module and not only sensor that
detect something going wrong? And what kind of test can I do to figure
it out? I already removed the module and opened it by curiosity and
obviously found nothing easy to see like capacitor, resistance and
amplifier with bad soldering. After I reinstalled it, the lights was
ok for a day but I did not felt any abs automated test that day! The
day after, I felt that test and the lights camo on again!

Thank you

Luc

(I am already receiving 1000 spam per day, so
another one...)

 

The abs tracs control module is failing there are 2 choices purchase from
the dealer or search for a company that builds them

--
"*-344-*Never Forgotten"
Is for the New York City fireman who lost their lives on September 11,2001.
The official count is 343, but there was also a volunteer who lost his life
aiding in the initial rescue efforts. And I will never forget them as long
as I live,
nor should any American.
"Mow Green"

 

Best way is to read the fault codes:

A DIY reader is available here:

http://www.onboarddiagnostics.co.uk/volfcr/index.htm

This software will work with the ISO only interface lead from
http://www.obd-2.com/ this is cheaper than the UK lead and you get the OBD2
software too.


The usual fault code indicating a failing ECU is for the right rear sensor.

Look carefully with a magnifying glass at the connections from the PCB to
the wiring connecter.
The joints are usually cracked and need resoldering at the wiring connector
end.

 

This is a known problem. I don't have the tsb here, but there is a valve
and connector that needs to be inspected for brake fluid contamination
as well as replacement of the control unit. Pulling codes will tell you
that the right rear wheel sensor is at fault.

Bob