ABS Speed Sensor

JHIBBARD

MEMBER
CHEVROLET

Does anyone know how to test a anti-lock speed sensor.
I have a 98 chevy astro rear wheel drive and my speed sensor is located toward the end of my transmission on the passenger side. I have checked the plug and it looks ok.
Thanks

Friday, December 1st, 2006 AT 9:24 PM

3 Replies

NOS155

MEMBER
16 POSTS

Should be ok as long as the ABS light on the dash cluster is not illuminated.

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Saturday, December 2nd, 2006 AT 1:42 AM

JHIBBARD

MEMBER
11 POSTS

N

My Light is on.
When I start up my van the light comes on and then off. As long as the van isn't moving the light won't come on. As soon as I start moving the light comes on and stays on until I shut off engine and start back. Then back on when I move again. I Don't know if the sensor is working or not. It seems that it is. I was told that it is a magnetic device that picks up as the transmission is turning. If that is so I think it is working. But I would like to know how to test it to be sure. I priced this sensor and it is $60.
Thanks for the reply

Was this

answer

helpful?

Yes

No

Saturday, December 2nd, 2006 AT 9:54 AM

MATHIASO

MECHANIC
1,209 POSTS

This is a potentiometer and it has three wires:
-the first wire is called the voltage reference wire and it should be 5 volts which is supplied by the computer.
- the second wire is the ground wire and it should be almost 0 volt ( ground voltage)
between the voltage reference and the gound wire is the resistor, it should be between 0 and 5 vots depending on the point tested.
This voltages vary because each coil is an electrical load with the next coil.

Was this

answer

helpful?

Yes

No

Saturday, December 2nd, 2006 AT 11:35 AM