[modern] XJ40 Anti-Lock Warning

Hello Everyone!

My '90 XJ40 has developed a strange Anti-Lock Warning.
All is well when starting up. After starting to move the car, takes about a
half block, the warning light comes on. Just the Anti-Lock and not the
Brake warning. Sometimes it will go out and not come on again for several
miles and then comes on again. Most of the time it will just stay on.
Brakes work normally(haven’t found a good anit-lock test) otherwise.
I have gone through the archives and don’t really see anything specific to
this problem. I am looking for places to look from others experiences here.
No brake work has been done recently and all seems to work properly. Pump
runs for about 30 seconds and then only runs after about 3 or 4 brake pedal
actions for just a couple seconds.

Any suggestions?

Thanks.

Steve Charles
Sterling Engineered Sales
39 E. Main Street
Salem, VA 24153
540-375-0923 Fax: 540-375-0924

Steve,
Wheel sensor?
Rgds:Jukka
XJ40 Sovereign 3.6 -89 MANX 164100km-----Original Message-----
From: Steve Charles s.n.charles@att.net
To: Jag Lovers modern@jag-lovers.org
Date: 29. tammikuuta 2002 14:16
Subject: [modern] XJ40 Anti-Lock Warning

Hello Everyone!

My '90 XJ40 has developed a strange Anti-Lock Warning.
All is well when starting up. After starting to move the car, takes about
a
half block, the warning light comes on. Just the Anti-Lock and not the
Brake warning. Sometimes it will go out and not come on again for several
miles and then comes on again. Most of the time it will just stay on.
Brakes work normally(haven’t found a good anit-lock test) otherwise.
I have gone through the archives and don’t really see anything specific to
this problem. I am looking for places to look from others experiences
here.
No brake work has been done recently and all seems to work properly. Pump
runs for about 30 seconds and then only runs after about 3 or 4 brake pedal
actions for just a couple seconds.

Any suggestions?

Thanks.

Steve Charles
Sterling Engineered Sales
39 E. Main Street
Salem, VA 24153
540-375-0923 Fax: 540-375-0924

Steve,

Typically an intermittent fail like you have is caused by the Over Voltage
Relay in the boot (trunk) having a cracked solder joint. The OVR is the tall
one on the left hand bank of relays. Take the cover off and reflow the
solder joints, there is quite a bulky mechanism in there which is prone to
viration induced cracks.

It isn’t likely to be a wheel sensor as they typically fail and stay failed
for the duration of your trip once the output voltage drops too low for the
system.

Alistair
88 XJ6> -----Original Message-----

From: owner-modern@jag-lovers.org [mailto:owner-modern@jag-lovers.org]On
Behalf Of Steve Charles
Sent: Tuesday, 29 January 2002 11:14 PM
To: Jag Lovers
Subject: [modern] XJ40 Anti-Lock Warning

Hello Everyone!

My '90 XJ40 has developed a strange Anti-Lock Warning.
All is well when starting up. After starting to move the car,
takes about a
half block, the warning light comes on. Just the Anti-Lock and not the
Brake warning. Sometimes it will go out and not come on again for several
miles and then comes on again. Most of the time it will just stay on.
Brakes work normally(haven’t found a good anit-lock test) otherwise.
I have gone through the archives and don’t really see anything specific to
this problem. I am looking for places to look from others
experiences here.
No brake work has been done recently and all seems to work properly. Pump
runs for about 30 seconds and then only runs after about 3 or 4
brake pedal
actions for just a couple seconds.

Any suggestions?

Thanks.

Steve Charles
Sterling Engineered Sales
39 E. Main Street
Salem, VA 24153
540-375-0923 Fax: 540-375-0924

Steve,
Your car being a 1990, you have the teves system, and no
overvolts relay, so rule that out.

The alarm is triggered by…

Pressure switch on the back of the pump.
Its a gold colored thing with a blue connector.
The connector should be cleaned, and pay attention
to the pins on the switch side.

Wheel sensors…the newer teves system does not
have the same problem with the sensors corroding away as the
girling system did, but the wires can have a problem,
the sensor can be loose in its mount, or the tip can be
contaminated with something.

The system has diagnostics, and they should be in the archives
or on the web page.
You short a connector in the trunk and the abs light flashes
codes…

Brett
1990 XJ6> Hello Everyone!

My '90 XJ40 has developed a strange Anti-Lock Warning.
All is well when starting up. After starting to move the
car, takes about a
half block, the warning light comes on. Just the Anti-Lock
and not the
Brake warning. Sometimes it will go out and not come on
again for several
miles and then comes on again. Most of the time it will just stay on.
Brakes work normally(haven’t found a good anit-lock test) otherwise.
I have gone through the archives and don’t really see
anything specific to
this problem. I am looking for places to look from others
experiences here.
No brake work has been done recently and all seems to work
properly. Pump
runs for about 30 seconds and then only runs after about 3 or
4 brake pedal
actions for just a couple seconds.

Any suggestions?

Thanks.

Steve Charles

Alistair,
Was it like that?IMHO it is if you get alarm staright after start it is that
ov-relay.If you get warning in driving then it is wheel sensor.That was
my case in couple of years ago.I get warning when driving.It was
mega corroded wheel sensor.Both replaced and problem solved for
next ten years?
Rgds:Jukka
XJ40 Sovereign 3.6 -89 MANX 164200km-----Original Message-----
From: Alistair Roberts Alistair.Roberts@utas.edu.au
To: Steve Charles s.n.charles@att.net; Jag Lovers modern@jag-lovers.org
Date: 30. tammikuuta 2002 1:53
Subject: RE: [modern] XJ40 Anti-Lock Warning

Steve,

Typically an intermittent fail like you have is caused by the Over Voltage
Relay in the boot (trunk) having a cracked solder joint. The OVR is the
tall
one on the left hand bank of relays. Take the cover off and reflow the
solder joints, there is quite a bulky mechanism in there which is prone to
viration induced cracks.

It isn’t likely to be a wheel sensor as they typically fail and stay failed
for the duration of your trip once the output voltage drops too low for the
system.

Alistair
88 XJ6

-----Original Message-----
From: owner-modern@jag-lovers.org [mailto:owner-modern@jag-lovers.org]On
Behalf Of Steve Charles
Sent: Tuesday, 29 January 2002 11:14 PM
To: Jag Lovers
Subject: [modern] XJ40 Anti-Lock Warning

Hello Everyone!

My '90 XJ40 has developed a strange Anti-Lock Warning.
All is well when starting up. After starting to move the car,
takes about a
half block, the warning light comes on. Just the Anti-Lock and not the
Brake warning. Sometimes it will go out and not come on again for
several

miles and then comes on again. Most of the time it will just stay on.
Brakes work normally(haven’t found a good anit-lock test) otherwise.
I have gone through the archives and don’t really see anything specific
to

this problem. I am looking for places to look from others
experiences here.
No brake work has been done recently and all seems to work properly. Pump
runs for about 30 seconds and then only runs after about 3 or 4
brake pedal
actions for just a couple seconds.

Any suggestions?

Thanks.

Steve Charles
Sterling Engineered Sales
39 E. Main Street
Salem, VA 24153
540-375-0923 Fax: 540-375-0924

Below is what was causing my Anti Lock warning to be intermittent. I would
clean it as per Brett’s suggestions.

John
90 XJ6

<Pressure switch on the back of the pump.
Its a gold colored thing with a blue connector.
The connector should be cleaned, and pay attention
to the pins on the switch side>.

Jukka,

Well, apart from the fact that I misread the age of Steve’s car (it’s got
the Teves system), I think my diagnosis for the 87-89 models is correct.

The OVR can intermittently fail thus the ABS comes on and off while driving
(which was Steve’s description). The ABS will reactivate if a flaky OVR
decides it’s working again for a while, assuming the sensors are OK.

The sensors on the other hand can fail immediately or after a few minutes of
driving, due to the two-pass test. They may pass the first pass but fail the
second pass. Once the sensors have failed the ABS system will not
re-activate while driving.

Steve, my apologies for the mis-diagnosis of your '90…

Alistair
88 XJ6> -----Original Message-----

From: owner-modern@jag-lovers.org [mailto:owner-modern@jag-lovers.org]On
Behalf Of Jukka Linneo
Sent: Thursday, 31 January 2002 2:33 AM
To: jag list
Subject: Re: [modern] XJ40 Anti-Lock Warning

Alistair,
Was it like that?IMHO it is if you get alarm staright after start
it is that
ov-relay.If you get warning in driving then it is wheel sensor.That was
my case in couple of years ago.I get warning when driving.It was
mega corroded wheel sensor.Both replaced and problem solved for
next ten years?
Rgds:Jukka
XJ40 Sovereign 3.6 -89 MANX 164200km
-----Original Message-----
From: Alistair Roberts <@Alistair_Roberts1>
To: Steve Charles s.n.charles@att.net; Jag Lovers
modern@jag-lovers.org
Date: 30. tammikuuta 2002 1:53
Subject: RE: [modern] XJ40 Anti-Lock Warning

Steve,

Typically an intermittent fail like you have is caused by the
Over Voltage
Relay in the boot (trunk) having a cracked solder joint. The OVR is the
tall
one on the left hand bank of relays. Take the cover off and reflow the
solder joints, there is quite a bulky mechanism in there which
is prone to
viration induced cracks.

It isn’t likely to be a wheel sensor as they typically fail and
stay failed
for the duration of your trip once the output voltage drops too
low for the
system.

Alistair
88 XJ6

-----Original Message-----
From: owner-modern@jag-lovers.org
[mailto:owner-modern@jag-lovers.org]On

Behalf Of Steve Charles
Sent: Tuesday, 29 January 2002 11:14 PM
To: Jag Lovers
Subject: [modern] XJ40 Anti-Lock Warning

Hello Everyone!

My '90 XJ40 has developed a strange Anti-Lock Warning.
All is well when starting up. After starting to move the car,
takes about a
half block, the warning light comes on. Just the Anti-Lock and not the
Brake warning. Sometimes it will go out and not come on again for
several

miles and then comes on again. Most of the time it will just stay on.
Brakes work normally(haven’t found a good anit-lock test) otherwise.
I have gone through the archives and don’t really see anything specific
to

this problem. I am looking for places to look from others
experiences here.
No brake work has been done recently and all seems to work
properly. Pump

runs for about 30 seconds and then only runs after about 3 or 4
brake pedal
actions for just a couple seconds.

Any suggestions?

Thanks.

Steve Charles
Sterling Engineered Sales
39 E. Main Street
Salem, VA 24153
540-375-0923 Fax: 540-375-0924

Steve,

I posted the codes in the past.

Did you look on the web page?

They may be there.

To get the codes, you short the black wire to the brown with pink wire
in the PM4 diagnostic plug close to the abs ecu in the trunk behind
the left trunk liner.
After shorting the connector pins, you turn the key on
and the codes flash after 6 seconds on the abs light.

What did the connections on the pressure switch look like?
Did you inspect the contacts on the switch itself??
I would suspect the contacts if the alarm was intermittent
and its on all the time now.

No point in disabling the abs system, you will still have the alarm
on the dash, and when you have the alarm, the system is disabled.

You may need to remove the switch from the pump and check the contacts
as you cant see them with it in place.
Pump the brake pedal till it gets hard before removing
anything on the system to release the pressure.

I had to solder wires onto what was left of the contacts on the switch,
as they were almost totally gone.
The switch is something like $300.00 or more…maybe $650.00…

Brett
1990 XJ6>

Brett,
I have just spent about four hours searching the archives looking for
information on how to extract the stored codes in this teves
system with no
success. Seems there is a lot of information about the 88-89
ABS problems
but little on the '90.

Do you have any idea where I might find out how to get the
codes from the
car and then a list of what they mean?

I cleaned the connector on the pressure switch, as you
suggested and now
have a anti-lock light all the time. May be the switch was
flaky and is now
gone.

Can anti-lock be disabled on the teves equipped cars?

Thanks,
Steve