'93 SE: Checking 4 Wheel Speed Sensor readings, need input. - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

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Old 11-29-2005, 11:56 AM   #1  
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Default '93 SE: Checking 4 Wheel Speed Sensor readings, need input.

For starters, the ABS and Traction off lights both came on this past summer on the '93 SE as both systems ceased to work. It was intermittent for a few weeks but since then constant. I have been through this two years before and it turned out to be a faulty left front wheel speed sensor (WSS) which a new hub fixed. I actually bought two hubs then, and only used one. I was hoping that this time it would be the same problem as I still have another new front hub. I've also been trying to check a few things myself, hoping to avoid turning the car over to the shops. I found some tips around this forum here and tried most. I'm a little stuck on the last one below (#6), and could use some input. I simply can't have the EBCM codes read at this time even though I know that would be the best next step.
So far I have:
1. Power washed the backs of the hubs.
2. Visually checked the wires and cleaned the connects/plugs on all four sensors. All looks good here.
3. Bled all four brake lines at the wheels.
4. Checked all fuses including the ABS fuse. All are good.
5. Visually checked and cleaned connects at EBCM and PMV with contact cleaner.

Here'* where I'm getting stuck:

6. Last, I checked the ohms readings of all four WSS'* on the vehicle and also on the new Timken front hub I have sitting in the garage to check for similarities/differences.
Here is what the high/low readings are (and the difference variance/range):
Right Rear WSS: 1027 - 1079 ohms (range 52) (original hub)
Left - Rear - WSS: 980 - 1030 ohms (range 50) (original hub)
Right Front WSS: 1030 - 1100 ohms (range 70) (original hub)
Left - Front - WSS: 940 - 1030 ohms (range 90) (2yr old Timken hub)
New Front WSS: 1069 - 1110 ohms (range 41) (New Timken front hub)

The left front readings look slightly different although not by much. Does any one know what the actual front and rear specs are? Or do any of these reading point to a problem in the sensors?
I'm thinking maybe the LF 940 ohm reading maybe just out of spec, by about 40 ohms or so. Any input or even advice on things I can try please!

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Old 11-29-2005, 12:43 PM   #2  
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I've never seen anyone successfully diagnose this with a meter, and other possibilites are still at large in your system.

What makes you so sure it'* a hub?
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Old 11-29-2005, 03:51 PM   #3  
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Thanks for replying willwren.

I'm well aware that other possibilities are still at large, but most of those I cannot diagnose myself. I'm not at all sure it'* the hub.

I simply wanted to check the hub sensors myself since "I can", but I need to know the acceptable range/specs to do so.

I'm simply asking what the EBCM would see as an acceptable range. The Teves ABS/WSS sensors produce an alternating current that is seen by the EBTCM. The voltage must be, amongst several other things, within an acceptable range or the system will fail. Generally when ABS sensors are disconnected this can also be measured using the fluctuations in resistance/ohms of the sensor. If a technition were to troubleshoot a known code that led him to a specific wheels sensors circuit using a multimeter, he could check the resistance of the sensor itself, and the resistance of the circuit on the wires farther near the EBTCM if he knew what range was acceptable. I just want to check this one possiblity the old fasion way since I already have a hub and a DVOM/multimeter.

Sure I wish I could do better and let the shop read the codes and check all possibilities, but I just cant do that at this time.

Anyone know the specs?
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