Confused after checking steering wheel possition sensor ??
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
Likes: 143
Confused after checking steering wheel possition sensor ??
Im getting current TCS 1287 and 1288 codes on my 2001 Z06 . The car had the steering column and airbag replaced at one time and has had constant service trac control and active handling problems since I have owned it.
I probed the blue wire from the steering wheel position sensor and am getting exactly 0.00 volts with the steering wheel centered . I hear it should read 0.5 or 0.25 volts when centered ?? Does anybody know for sure what this should read ??
Also If I undo the steering shaft and rotate it to read the correct voltage hod do I go about re centering the steering wheel itself ??
Any help would be greatly appreciated !!
Thanks
I probed the blue wire from the steering wheel position sensor and am getting exactly 0.00 volts with the steering wheel centered . I hear it should read 0.5 or 0.25 volts when centered ?? Does anybody know for sure what this should read ??
Also If I undo the steering shaft and rotate it to read the correct voltage hod do I go about re centering the steering wheel itself ??
Any help would be greatly appreciated !!
Thanks
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
Likes: 143
Also I should add , with the steering shaft off the vehicle I did some more tests.
Steering wheel centered ( as if driving straight ) Reads 0.0 - 0.2
Steering wheel inverted ( looks perfectly upside down ) = 5.0
Steering wheel turned 90 degrees left or right ( wheel sideways ) = 2.5
Would someone please tap there steering wheel position sensor and post there findings .
Steering wheel centered ( as if driving straight ) Reads 0.0 - 0.2
Steering wheel inverted ( looks perfectly upside down ) = 5.0
Steering wheel turned 90 degrees left or right ( wheel sideways ) = 2.5
Would someone please tap there steering wheel position sensor and post there findings .
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
Likes: 143
TTT
I need H E L P
After pulling everything apart I see that there is only 1 blue wire and not two so I probed the other wires and I get the correct voltage reading from the G R E E N wire !! Can someone give me th eactual pin location of the analog wire I should be probing to get the correct reading . Im stressing !!
PS: Both wires give varying voltages with the movement of the steering wheel and both wires repeat these readings perfectly at 360 degree intervals ( but each gives different readings ). How can people be experiencing there wheels being 360 degrees out if the sensor starts over again at 360 anyways ? :o
I need H E L P
After pulling everything apart I see that there is only 1 blue wire and not two so I probed the other wires and I get the correct voltage reading from the G R E E N wire !! Can someone give me th eactual pin location of the analog wire I should be probing to get the correct reading . Im stressing !!
PS: Both wires give varying voltages with the movement of the steering wheel and both wires repeat these readings perfectly at 360 degree intervals ( but each gives different readings ). How can people be experiencing there wheels being 360 degrees out if the sensor starts over again at 360 anyways ? :o
Last edited by I brake for nothing; Mar 20, 2006 at 06:46 PM.
Burning Brakes
Joined: Nov 2004
Posts: 993
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From: PA
OK, lets get back to the start; you are throwing codes and all the tests you have performed on the SWPS indicates _ / + 2.5 vDC. This indicates the sensor on the steering wheel is functioning correctly. Get back to the troubleshooting for the codes. Not to sound like a broken record, but my 98 threw the same codes, the fix was cleaning and relanding the grounds. Sorry I can't tell you exaclty which ground, because I did 6 of them and never had the problem again. Also, if you are occasionally getting the reduced power message, try cleaning and relanding the grounds by the EBTCM.
Melting Slicks
Joined: Feb 2001
Posts: 2,803
Likes: 357
From: Northville, MI
With the wheels pointed straight ahead and the steering wheel centered, you should be reading 2.4-2.5v. If your are 90 degrees off, like you tested your tie rods need to be adjusted to recenter the wheel.
However, there are two blue wires that go to the SWP, make sure you are measuring the middle blue one. If you do not have AH, then you need someone with BCM software to measure. That would include the Tech2 and EASE. There was a thread many years ago on how to do it when only the one blue wire is on the switch. I can't remember the proceedure but if it looks like this, then the above does not apply.
http://gamarco.com/z06/sps2.jpg
However, there are two blue wires that go to the SWP, make sure you are measuring the middle blue one. If you do not have AH, then you need someone with BCM software to measure. That would include the Tech2 and EASE. There was a thread many years ago on how to do it when only the one blue wire is on the switch. I can't remember the proceedure but if it looks like this, then the above does not apply.
http://gamarco.com/z06/sps2.jpg
Le Mans Master
Joined: Dec 2003
Posts: 5,561
Likes: 448
From: Atlanta metro Ga.
Yes, the reading should be 2.5VDC with the wheels straight ahead. But to correct you unbolt the steering column shaft at the rack, rotate the steering wheel and re-assmble.
Regrdless if you have AH or not, the measuring points are the same. You can either access the wire (other side of meter goes to ground) on the EBCM (pain in the a$$ - mounted on the bracket near the front of the motor), or where it breaks out in the wiring harness plugs by the battery (that's what I used).
My appologies, I'm at work or I'd give you the pin number / plug number and location from the manual.
Regrdless if you have AH or not, the measuring points are the same. You can either access the wire (other side of meter goes to ground) on the EBCM (pain in the a$$ - mounted on the bracket near the front of the motor), or where it breaks out in the wiring harness plugs by the battery (that's what I used).
My appologies, I'm at work or I'd give you the pin number / plug number and location from the manual.
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
Likes: 143
Yes that is the connector I have but I swear my z06 says it has active handling on the dic service message ?? Do you think that someone has switched the steering column with the wrong replacement unit ( non active handling model ? )
When I tap the green wire from that picture I get 2.5 v at dead straight but when I do the blue one on the outside I get the odd ball readings.
Thanks for the help
When I tap the green wire from that picture I get 2.5 v at dead straight but when I do the blue one on the outside I get the odd ball readings.
Thanks for the help
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
Likes: 143
actually the harness is part of the hard wire of the car and not the column itself so I suppose thats not an option
One thing that still confuses me is that after turning the wheel 360 degrees the voltage messurements repeat themselves. . . . so what would be the purpose of rotating 360 and re connecting ?
One thing that still confuses me is that after turning the wheel 360 degrees the voltage messurements repeat themselves. . . . so what would be the purpose of rotating 360 and re connecting ?
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Le Mans Master
Joined: Dec 2003
Posts: 5,561
Likes: 448
From: Atlanta metro Ga.
Before we get too far down the road, can you tell us EXACTLY where you are measuring from (connector number, location, pin number, wire color)? If you call them out, I might remember off the top of my head if your on the right track or not.
I sent all this info to another member some months ago via PM, but I didn't save it.
I sent all this info to another member some months ago via PM, but I didn't save it.
Racer
Joined: Jan 2005
Posts: 375
Likes: 0
From: Montreal Drive it like you test it !
The connector is different with the newer C5. My friend has a 2002 Z06 and he has only 4 wires on the connector. I’m looking for the info as well. He asked me to help him resolving the 1287 code, but I only have the manuel for my 97.
Here is the old C5 connector where we can check if the lt blue wire (in the center of the connector) as 2.5 volt.
Previous years have 6 wires for the sensor
Pin 1 -GRY : +5 volt
Pin 2 -Orn/Blk : Ground
Pin 3 -Grn : Phase A
Pin 4 -LT Blue : Phase B (the one we sould fin 2.5 volt)
Pin 5 -White : Index signal
Pin 6 -Lt Blu : Analog output
Here are the voltage he got on his four wire 2002 connector.
Green wire
Center 2.55
Turned full to the LEFT .026
Turned full to the RIGHT 4.77
Bleu wire
Center 0.12
Turned full to the LEFT 2.78
Turned full to the RIGHT 2.84
Grey is 5 volts and orange black is ground
Maybe you have the same connector on your 2001. On your previous post you get 0.0 - 0.2 volt with the wheel center. My friends got the same reading to the green wire. But he went full turn as oppose to 90 degrees for the other reading.
2002 connector
Edit: Blue and green were inverted in the voltage section
Here is the old C5 connector where we can check if the lt blue wire (in the center of the connector) as 2.5 volt.
Previous years have 6 wires for the sensor
Pin 1 -GRY : +5 volt
Pin 2 -Orn/Blk : Ground
Pin 3 -Grn : Phase A
Pin 4 -LT Blue : Phase B (the one we sould fin 2.5 volt)
Pin 5 -White : Index signal
Pin 6 -Lt Blu : Analog output
Here are the voltage he got on his four wire 2002 connector.
Green wire
Center 2.55
Turned full to the LEFT .026
Turned full to the RIGHT 4.77
Bleu wire
Center 0.12
Turned full to the LEFT 2.78
Turned full to the RIGHT 2.84
Grey is 5 volts and orange black is ground
Maybe you have the same connector on your 2001. On your previous post you get 0.0 - 0.2 volt with the wheel center. My friends got the same reading to the green wire. But he went full turn as oppose to 90 degrees for the other reading.
2002 connector
Edit: Blue and green were inverted in the voltage section
Last edited by vette747; Mar 21, 2006 at 07:30 PM.
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
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Yeah thats definatly the connector I have. On his volt meter what was it set at ?? I noticed my results varried when I changed settings .
When you say full to the left or full to the right is that upside down ( like 180 degrees ) or 1 full turn around ?
When you say full to the left or full to the right is that upside down ( like 180 degrees ) or 1 full turn around ?
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
Likes: 143
Originally Posted by Dan_the_C5_Man
Before we get too far down the road, can you tell us EXACTLY where you are measuring from (connector number, location, pin number, wire color)? If you call them out, I might remember off the top of my head if your on the right track or not.
I sent all this info to another member some months ago via PM, but I didn't save it.
I sent all this info to another member some months ago via PM, but I didn't save it.
When I probed the blue wire shown posted 0.0 dead center , 2.5 90 degrees left and 90 degrees right and 5.0 with the wheel totally inverted ( 180 degrees ) . These readings just repeated themselves no matter how many times around and around in either direction I would turn the wheel.
The green wire produced the correct 2.5 volts at dead center ( cant remember the 90 and 180 ) but the readings also just repeat over and over with turns of the wheel in either direction and were also mirrored from left to right.
Last edited by I brake for nothing; Mar 21, 2006 at 05:20 PM.
Racer
Joined: Jan 2005
Posts: 375
Likes: 0
From: Montreal Drive it like you test it !
Originally Posted by I brake for nothing
Yeah thats definatly the connector I have. On his volt meter what was it set at ?? I noticed my results varried when I changed settings .
Originally Posted by I brake for nothing
When you say full to the left or full to the right is that upside down ( like 180 degrees ) or 1 full turn around ?
One thing I notice thought is that you get the same reading than my friend on both wires when the wheel is centered:
Your car
Blue: 0.0
Green: 2.5
My friend car
Blue: 0.09
Green: 2.55
It will let the pros with the manual to respond, but I think that in the newer cars, the wire that should have 2.5 centered is the Green one. The blue should be around 0.
Thanks for your investigation. That gave me a lot of info.
Advanced
Joined: Apr 2005
Posts: 70
Likes: 0
From: Montreal
Oh.. wow I am finally not alone with this problem,
please visit my SPS web page i made, and vette747 is refering to....
http://gamarco.com/z06/splice/Steeri...ion_Sensor.htm
i wrote down all the voltages I got with the steering position turned left, right and center...
Where are you grounding your negative probe on your volt meter? I would connect my negative terminal of my volt meter to the metal plate part of the plate/bolt located under the accelerator pedal....
I have been reasearching this problem with Vette747 for the past couple of months, i didn't take my car out of storage, so i don't know if i fixed this problem due to chasis ground being dirty.
I am just praying, its not the EBCTM thingy....
please visit my SPS web page i made, and vette747 is refering to....
http://gamarco.com/z06/splice/Steeri...ion_Sensor.htm
i wrote down all the voltages I got with the steering position turned left, right and center...
Where are you grounding your negative probe on your volt meter? I would connect my negative terminal of my volt meter to the metal plate part of the plate/bolt located under the accelerator pedal....
I have been reasearching this problem with Vette747 for the past couple of months, i didn't take my car out of storage, so i don't know if i fixed this problem due to chasis ground being dirty.
I am just praying, its not the EBCTM thingy....
Last edited by mannygmt2; Mar 21, 2006 at 09:29 PM.
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
Likes: 143
Originally Posted by vette747
This is strange. Only the scale should vary. Not the value. Most of the voltmeters have scale i.e. 0-5 volts 0-12 volts. So you should have the same value but on a different scale. Unless you have a multimeter and you go from volt to ohms to amp.
That was fully turning the wheel to the left so it cannot be turn anymore. In other word, turning it to the maximum it can go.
One thing I notice thought is that you get the same reading than my friend on both wires when the wheel is centered:
Your car
Blue: 0.0
Green: 2.5
My friend car
Blue: 0.09
Green: 2.55
It will let the pros with the manual to respond, but I think that in the newer cars, the wire that should have 2.5 centered is the Green one. The blue should be around 0.
Thanks for your investigation. That gave me a lot of info.
That was fully turning the wheel to the left so it cannot be turn anymore. In other word, turning it to the maximum it can go.
One thing I notice thought is that you get the same reading than my friend on both wires when the wheel is centered:
Your car
Blue: 0.0
Green: 2.5
My friend car
Blue: 0.09
Green: 2.55
It will let the pros with the manual to respond, but I think that in the newer cars, the wire that should have 2.5 centered is the Green one. The blue should be around 0.
Thanks for your investigation. That gave me a lot of info.
Yup its a multi meter thats where I must have gotten the different readings from ( two Volt sections )
When you say all the way left or all the way right is that with the wheels still connected with the steering shaft right ? Otherwise mine will just keep spinning . ( On a side note I pulled the bag too and theres no way the air bag wiring can easily be broken by turning it too far as was posted in another thread , it seems its all designed to free wheel in the center section )
Racer
Joined: Jan 2005
Posts: 375
Likes: 0
From: Montreal Drive it like you test it !
Originally Posted by I brake for nothing
When you say all the way left or all the way right is that with the wheels still connected with the steering shaft right ?
Thread Starter
Burning Brakes
Joined: Dec 2004
Posts: 1,149
Likes: 143
You guys are both getting 4.77 at full right . Im back to wanting to disable this whole thing again LOL.
EDIT: Anyone know the going rate on one of these sensors from GM ? Im thinking I might as well replace it while ive got the column out . . .
EDIT: Anyone know the going rate on one of these sensors from GM ? Im thinking I might as well replace it while ive got the column out . . .
Last edited by I brake for nothing; Mar 21, 2006 at 09:53 PM.
Racer
Joined: Jan 2005
Posts: 375
Likes: 0
From: Montreal Drive it like you test it !
Originally Posted by I brake for nothing
You guys are both getting 4.77 at full right .
Originally Posted by I brake for nothing
EDIT: Anyone know the going rate on one of these sensors from GM ? Im thinking I might as well replace it while ive got the column out . . .
Position sensor - 2001 - 2004 $36.91 Fred beans.
