wheel speed issue.

[discowhite]

with the 90 stopped i have a rear left wheel speed of 0442.9Km/h:eek: the others are all at 0001.7Km/h!
would this be a dead abs sensor?


cheers phil

[BigJon]

Eiher that or you are doing a really big burnout! :p

[Redback]

Tyre size difference, tyre pressure difference, doesn't have to be much i think.

Baz.

[discowhite]

maybe! but the cars parked!

cheers phil

[justinc]

with the 90 stopped i have a rear left wheel speed of 0442.9Km/h:eek: the others are all at 0001.7Km/h!
would this be a dead abs sensor?


cheers phil

Hi Phil,
I would say electrical noise or magnetic field causing interference, has it got a fault code too for that wheel?

JC

[LandyAndy]

Hi Phil
Another way to check.
Jack the wheels up one at a time,handbrake off ease it into gear and watch the speedo reading at the given speed.If its a sensor not working the speedo will read a very high speed for the faulty wheel sensor as it cant reference the wheel speed by dividing it by 4.That is how I worked out which one was faulty on my D2.When I bought my Nanocom fault codes confirmed the same sensor.
Obviously CDL MUST be unlocked and wont work if you have a True Trac or Detroit locker.
Goodluck
Andrew

[discowhite]

Hi Phil,
I would say electrical noise or magnetic field causing interference, has it got a fault code too for that wheel?

JC

nope, no faults, thats the weird thing... the fault i was chasing i thought was in the front end, during the 3 link install i also did the swivell preload, i removed the only shims that were there, and after that the abs and tc lights stayed on, till today? front end didnt show any faults none at all when i did the test:eek: the wheel speed issue was all i found:(

if it was electrical noise or magnetic field what would i be looking for cause wise

cheers phil

[discowhite]

Hi Phil
Another way to check.
Jack the wheels up one at a time,handbrake off ease it into gear and watch the speedo reading at the given speed.If its a sensor not working the speedo will read a very high speed for the faulty wheel sensor as it cant reference the wheel speed by dividing it by 4.That is how I worked out which one was faulty on my D2.When I bought my Nanocom fault codes confirmed the same sensor.
Obviously CDL MUST be unlocked and wont work if you have a True Trac or Detroit locker.
Goodluck
Andrew


:eek:thanks andy....i have a true track and detroit....:eek: but.....
i have to change the front prop soon so ill lock the transfer and then i only need the rear off the ground.

cheers phil

[Graeme]

with the 90 stopped i have a rear left wheel speed of 0442.9Km/h:eek: the others are all at 0001.7Km/h!
would this be a dead abs sensor?


cheers phil
Why wouldn't you just unplug the LR sensor and see if the speed is still there? If not, then its in the sensor I would think.

[justinc]

nope, no faults, thats the weird thing... the fault i was chasing i thought was in the front end, during the 3 link install i also did the swivell preload, i removed the only shims that were there, and after that the abs and tc lights stayed on, till today? front end didnt show any faults none at all when i did the test:eek: the wheel speed issue was all i found:(

if it was electrical noise or magnetic field what would i be looking for cause wise

cheers phil

Hi Phil,
Electrical noise could be from fuel pump etc while ignition switched on. Mag field from a magnetised wheel sensor.

But as Graeme suggests, unplug it first to see if it is in the loom or the sensor itself.

JC

[discowhite]

ok

test faults with nanocom...none....
wheel speed still at 442.9 on rear left.

unplug rear left, test faults....fault 06/06 rear left electrical failure CURRENT 0000times
and input shows wheel speed at 5.2.....but the front left sensor volts go from 2.25v to .01v while the other wheel remain at 2.25v and 1.7kph?

confused even more...

cheers phil

[Redback]

ok

test faults with nanocom...none....
wheel speed still at 442.9 on rear left.

unplug rear left, test faults....fault 06/06 rear left electrical failure CURRENT 0000times
and input shows wheel speed at 5.2.....but the front left sensor volts go from 2.25v to .01v while the other wheel remain at 2.25v and 1.7kph?

confused even more...

cheers phil

Just live with the fact that with all the performance mods, it fast even when it's stopped;)

Baz.

[rangieman]

Just live with the fact that with all the performance mods, it fast even when it's stopped;)

Baz.
:Rolling::clap2::Rolling::clap2::Rolling::burnrubb er:

[LandyAndy]

ONYA BAZ:D:D:D:D:D:D:D
Andrew

[discowhite]

:eek:if im gonna get booked ide rather not be stopped:twisted:

cheers phil

[Pedro_The_Swift]

Have you tried jacking that wheel and letting it idle?

if the sensor is bad the speedo will show it,,

although by now you probably realise that.......:angel:

[beforethevision]

Just a thought, but its a frequency calculation, so the wire may be damaged (ie broken). Its quite possibly a hall effect pickup, so not easy to test stationary. Either that, or the stator/rotor is buggered. We have had problems like that with Motec TC systems, crazy high values. Unplug the other side and see if it goes to a high speed also.

Cheers!

[paul-defender]

Hi,
i had a crazy wheel sensor in my td5 defender, would apply brakes and traction control randomly while driving, turns out the wire was cracked where it went into the sensor. some very careful soldering and some electrical grade silastic saved me several hundred dollars for a new sensor.

[Quarks]

I was using the Nanocom yesterday, and noticed I had the same irregularity.
But since a 110 is slower than a 90, the LH/R wheel was only doing 408km/h, with vehicle parked.
No faults recorded, nothing unusual has been noticed.

Don't know if it becomes normal again with movement over the minimum detectable speed (about 2.5km/h from memory).

:)
Geoff

[discowhite]

i sent all my info to nanocom, there response was
''it is all correct'' !??

so i spose that how it should be:eek:

cheers phil

[Quarks]

Well, if Nanocom say it's all right, then I'm scratching my head! :eek:

I just did a moving test in the driveway with the Nanocom talking to the ABS computer.
I noted that all 4 sensor voltages were similar (within about .1 V of each other); both stationary and when moving.
At stationary, I had 3 wheels on 1.7km/h and one at 404.8km/h; then when moving, 3 wheels were doing 2.7km/h and the fourth was doing 396km/h!
(And I hadn't disabled TC; so I wasn't doing :burnrubber: either!)

So I suspect that the speed may be a miscalculation in converting the sensor volts/frequency into km/h.

:)
Geoff

[discowhite]

which wheel sensor was it that had the high reading geoff?

cheers phil

[Graeme]

... over the minimum detectable speed (about 2.5km/h from memory).
Whilst the D2 speedo wont show lesser speeds, the ABS ecu generates a distance/speed pulse for every 200mm travelled plus a 1hz base pulse.

[Quarks]

which wheel sensor was it that had the high reading geoff?

cheers phil

Left hand rear wheel. Same one as yours. ;)

Are you running firmware 2.03 on the Nanocom?

:)
Geoff

[discowhite]

yep all up to date and 2.03..

cheers phil