ABS and MSP light on

[richard_masa_4200]

I have a problem that needs some community thought.

My ABS and MSP off lights come on shortly after taking off. If I switch off the car and then back on again the lights will extinguish, but come on again soon after I take off. This has only happenned since I installed my SS brake lines. With the lights off ABS and traction control work fine. So I needed to investigate further.

I put the front of the car on stands and removed both wheels. Started car and turned steering 1 rotation to the right and the ABS and MSP light comes on. Test again by turning to the left. 1 rotation and ABS and MSP light comes on.

Check wheel speed sensor, both sides read 1456 ohm when stationary.

Check both lateral accel sensors, Red-White 779 ohms, Red-Yell 987 ohms, Yell-White 959 ohms.

It took a long time to bleed the brakes after installing the new brake lines, but brakes work fine now.

The lights do not go off if I spin either wheel by hand.



This is driving me absolutely bonkers. If anyone has any idea please please put me out of my misery.

 

[CatmanV2]

It sounds to me like you're testing the correct things, but I have no idea if your test is valid.

Is it worth checking that the ABS senor connections are correctly seated?

C

 

[safrane]

Have you checked for damage to the phonic rings?

 

[richard_masa_4200]

It sounds to me like you're testing the correct things, but I have no idea if your test is valid.

Is it worth checking that the ABS senor connections are correctly seated?

C

Do you know which are the ABS sensors? Are they the wheel speed sensors?

 

[richard_masa_4200]

Have you checked for damage to the phonic rings?

Are the phonic rings the wheel speed sensors?

 

[allandwf]

I had same on Mercedes, was a chaffed wire going to sensor, I did same tests as you, but measured from ECU.

 

[CatmanV2]

Are the phonic rings the wheel speed sensors?

I believe that is the case, indeed.

C

 

[roger102]

I have a similar fault in the GT but it's the EPB and suspension lights that come on, sometimes it's the MSP as well and they can't resolve it yet.
They claim the suspension ECU was at fault and replaced it but I still get the light.

 

[richard_masa_4200]

Well it's taken a while, but this morning I have a clear dash. Yay! 2 wheel hubs replaced due to faulty phonic rings (speed sensors) and 1 vertical acceleration sensor (due to my skyhook light coming on while sorting the other stuff.

2 x secondhand wheel hubs from the U.S. for AUD$450 and a secondhand vertical acceleration sensor from Europe at AUD$87. Very happy little Vegemite this morning.

 

[CatmanV2]

Well done, sir!

C