ABS sensor fitting problem

Hot Fuzz · Sep 16, 2008

Hi all

Havin a problem with and ABS sensor,
While trying to remedy an air gap fault on my 95 RRC OSF i removed the sensor to clean the rust build up no the sensor wont go back in the hole,
It leave about 20mm still sticking up and im feared ill break it

What am i doing wrong,

Irishrover · Sep 16, 2008

The sensor fits into a spring type bush. Smear plenty of silicone grease on the sensor body and push it in until it contacts the reluctor ring.

Hot Fuzz · Sep 18, 2008

Thanks for the help, but it still wont go in the hole, i dont know how much preassure i can put on it and i dont want to start hammering it in???

Can the bush be replaced of does that involve dismantling the swivel???

Irishrover · Sep 18, 2008

There is quite a bit of resistance pushing the sensor in, and might require a light tap or two to fit it. The sensor, I assume came out o.k. but with a bit of a pull to overcome the built in spring tension of the bush. If you are unsure, I suggest you get a new bush from your local dealer and replace the existing one. As stated before, give the shank of the sensor a good greasing with SILICONE grease. Driving the car without the sensor in place will kick up an ABS fault and the ABS will be disabled, but normal braking available.

Hot Fuzz · Sep 22, 2008

Sensor now refitted and 2-13 code now cleared but ive now got a 2-8 code up,
Am i right in thinking that the ECU can only report one code at a time or is this a new fault after fitting the sensor.

Any help of comments please.

Irishrover · Sep 22, 2008

make sure the sensor is fully home and lightly touching the sensor ring

Hot Fuzz · Sep 22, 2008

Im not getting any voltage through the sensor when i spin the wheel either, is there any way of checking the sensor when its not fitted in place,
Cant tell if its far enough in the hole or not.

Thanks

bwarb · Sep 22, 2008

Hot Fuzz said:
Im not getting any voltage through the sensor when i spin the wheel either, is there any way of checking the sensor when its not fitted in place,
Cant tell if its far enough in the hole or not.

Thanks

Are RR ABS wheel sensors VRS or Hall Effect (how many wires go to them) ?

How are you checking for voltage at the sensor, I think you will need to look at the signal with a scope not a multi-meter .....?

Hot Fuzz · Sep 22, 2008

its a two pin plug into a sealed sensor, ive placed my multimeter across the pins and managed to read just under 1vDC on the NSF while spining the wheel but get nothing on the OSF???

Could some one put an ohms meter across a sensor they know works and give me a continuity reading that wold be great.

bwarb · Sep 22, 2008

Hot Fuzz said:
its a two pin plug into a sealed sensor, ive placed my multimeter across the pins and managed to read just under 1vDC on the NSF while spining the wheel but get nothing on the OSF??

Two wires would seem to imply that it's a variable reluctance sensor (VRS). The reference/trigger points on a VRS are the zero crossings and the overall signal is a variable amplitude sine wave. The peak to peak amplitude could be hundreds of volts depending on the size of the teeth, the air gap and the speed of rotation. If you measure it on a meter set to DC, the meter will average out the largely "AC type" signal and should return 0v or close to it (1v is close to it when p2p is 100+v).

Hot Fuzz said:
Could some one put an ohms meter across a sensor they know works and give me a continuity reading that wold be great.

I've never tried it as I have always checked VR signals with a scope, but have you tried monitoring the signal with the meter set to AC as that may return more meaningful results?

Irishrover · Sep 23, 2008

Push the sensor in until it just touches the reluctor ring. There is no way you can check the gap on a P38 anyway.

Hot Fuzz · Sep 24, 2008

A new (well second hand) sensor arrived via ebay from Range rover recycled parts so will go and give it a try,
Will let you know what i find,

Hot Fuzz · Sep 25, 2008

new (well second hand) sensor fitted, still getting the 2.8 fault code,
pulled the NSF one out (OSF was the replaced one) and swaped them over, on fault code bar the 2.8
Any way it went for an MOT and only failed on brake pipes, The local test centre whos moto “Helping You on the Road to Happiness” never even mentioned the ABS light.

ABS sensor fitting problem

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