What is the expected voltages in steering position sensor?
Thread Starter
Track Junky
Joined: Jun 2007
Posts: 4,075
Likes: 36
From: Orlando Area
Tech Contributor
What is the expected voltages in steering position sensor?
See posts #28 and up for details.
http://forums.corvetteforum.com/auto...-opinions.html
Cliff note version - I think I had compounding errors lead to early AH engagement on the track this past weekend. I will be setting thrust angle and zero steering wheel position over the next week or so to eliminate all the the error I had working against me. What is the expected voltage difference between pins 1-5 and pins 1-6 when the steering wheel is exactly level? I measured +0.39 V and -4.65 V respectively and want to make sure this is what the AH computer expects for true zero steering input. Can anybody confirm in the tech manual?
This is for a 2005 base C6 Z51.
Thanks in advance for an input,
Sean
http://forums.corvetteforum.com/auto...-opinions.html
Cliff note version - I think I had compounding errors lead to early AH engagement on the track this past weekend. I will be setting thrust angle and zero steering wheel position over the next week or so to eliminate all the the error I had working against me. What is the expected voltage difference between pins 1-5 and pins 1-6 when the steering wheel is exactly level? I measured +0.39 V and -4.65 V respectively and want to make sure this is what the AH computer expects for true zero steering input. Can anybody confirm in the tech manual?
This is for a 2005 base C6 Z51.
Thanks in advance for an input,
Sean
Thread Starter
Track Junky
Joined: Jun 2007
Posts: 4,075
Likes: 36
From: Orlando Area
Tech Contributor
Anybody? I'd like to know what the expected voltage of the steering wheel position sensor with the wheel exactly straight. I may be able to use that data if fixing the alignment/thrust angle doesn't solve the problem.
Maybe somebody could post the applicable pages out of the service manual on voltages and system operation?
Maybe somebody could post the applicable pages out of the service manual on voltages and system operation?
Melting Slicks
Joined: Sep 2009
Posts: 2,028
Likes: 357
I just spen about 20 minutes flipping through my 09 shop manuals. I couldn't find the voltage range listed anywhere. But, I did find that if the SW is not centered it will/might throw a code. Most of the ABS/AH diagnostic procedures say that the SW has to be centered when going straight.
I also found that an improperly installed (turned a little maybe) yaw sensor might confuse the computer. Shouldn't be an issue unless it's been moved/loose. Might check it to be sure.
The manual did state that when checking the SWPS the reading on the diagnostic tool (TECH2?) will be in degrees. So I infer that the TECH2 converts the voltage to a "degree left or right of center" reading.
I think your issues will go away if thrust angle is good and the SW is centered when going straight.
HTH
I also found that an improperly installed (turned a little maybe) yaw sensor might confuse the computer. Shouldn't be an issue unless it's been moved/loose. Might check it to be sure.
The manual did state that when checking the SWPS the reading on the diagnostic tool (TECH2?) will be in degrees. So I infer that the TECH2 converts the voltage to a "degree left or right of center" reading.
I think your issues will go away if thrust angle is good and the SW is centered when going straight.
HTH
Thread Starter
Track Junky
Joined: Jun 2007
Posts: 4,075
Likes: 36
From: Orlando Area
Tech Contributor
Yaw sensor has never been loosened. I hear that if all else fails, a Tech 2 can do a relearn to reset the steering center position. This only a backup plan at this point, but it is sparking my interest to see how this stuff works...
Thanks for looking.
Thanks for looking.
Last edited by taken19; Aug 21, 2012 at 01:27 PM.
Burning Brakes
Joined: May 2008
Posts: 752
Likes: 28
From: Ottawa, Ontario
I notice you have a 2005 C6. You did not say what kind of active handling issues you were getting on the track, so have you ruled out the connector problem at the base of the steering column that is the subject of a GM recall? See the "Sticky" above: "2005-2006 Corvettes Recalled"
Long story short: The tugging on the connector by the telescoping steering column causes the connection for the steering wheel position to lose continuity, causing the AH to engage erractically (i:e:. applies a front brake to varying degrees).
Long story short: The tugging on the connector by the telescoping steering column causes the connection for the steering wheel position to lose continuity, causing the AH to engage erractically (i:e:. applies a front brake to varying degrees).
Race Director
Joined: Jan 2005
Posts: 10,924
Likes: 854
From: Daytona Beach FL
Hey Sean
Here are some pages out of my 2006 Service Manual:
I think there are only references to 0.2 volts or 4.9 volts, and some resistance values.
Below are some pages out of my 2010 manual:
You can see that there's only sparse reference to voltage and resistance values - in 2009 they changed to a BOSCH ABS and the diagnostics are different than for your older Delphi ABS.
However, here's some description of the VSES/AH from the 2010 manual, and as far as I know this initialization of both systems are similar:
On that last page above (5-44) it says:
Also, it says:
This indicates to me that the system calibrates itself every time you start driving the car.
So.....the sensor is calibrated at the factory, and only requires calibration on the car if a new one is installed; and the sytem does an initialization procedure when you start the car and begin to drive it, so the system knows what the "zero" position is (I guess a straight ahead steering wheel postion for the SWPS).
Good luck!!!
Bob
Here are some pages out of my 2006 Service Manual:
I think there are only references to 0.2 volts or 4.9 volts, and some resistance values.
Below are some pages out of my 2010 manual:
You can see that there's only sparse reference to voltage and resistance values - in 2009 they changed to a BOSCH ABS and the diagnostics are different than for your older Delphi ABS.
However, here's some description of the VSES/AH from the 2010 manual, and as far as I know this initialization of both systems are similar:
On that last page above (5-44) it says:
The steering angle sensor calibration. The Steering Angle Sensor is calibrated at the assembly plant. If the sensor is replaced, follow the calibration procedure.
Also, it says:
Therefore, at the beginning of each ignition cycle, the EBCM must perform an initialization procedure to observe how the VSES sensors are correlated with each other and also to determine what each sensor value is when the applicable unit of measurement equals 0. This voltage is referred to as the sensor bias voltage.
This indicates to me that the system calibrates itself every time you start driving the car.
So.....the sensor is calibrated at the factory, and only requires calibration on the car if a new one is installed; and the sytem does an initialization procedure when you start the car and begin to drive it, so the system knows what the "zero" position is (I guess a straight ahead steering wheel postion for the SWPS).
Good luck!!!
Bob
Thread Starter
Track Junky
Joined: Jun 2007
Posts: 4,075
Likes: 36
From: Orlando Area
Tech Contributor
I notice you have a 2005 C6. You did not say what kind of active handling issues you were getting on the track, so have you ruled out the connector problem at the base of the steering column that is the subject of a GM recall? See the "Sticky" above: "2005-2006 Corvettes Recalled"
Long story short: The tugging on the connector by the telescoping steering column causes the connection for the steering wheel position to lose continuity, causing the AH to engage erractically (i:e:. applies a front brake to varying degrees).
Long story short: The tugging on the connector by the telescoping steering column causes the connection for the steering wheel position to lose continuity, causing the AH to engage erractically (i:e:. applies a front brake to varying degrees).
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Thread Starter
Track Junky
Joined: Jun 2007
Posts: 4,075
Likes: 36
From: Orlando Area
Tech Contributor
Bob, thanks a million for the info from the manual. The voltages I saw were between about 0.15-0.2V and 5.0-5.05V (pretty close in my book).
I wonder if the leak I'm seeing isn't the steering pump but the EBCM (not likely but I will look). I've been working 13 hr days and have no time for anything. With a hurricane coming, I think I know what I'll be doing this weekend... I really hope that the 2005 goes through the "center learn" routing at startup because that would eliminate the steering error into this whole equation. 0.3-0.5 thrust angle can't be enough to give me that many issues. I could feel the front brakes modulating in every corner. And no codes or warnings other that the Active Handeling on the DIC.
More to come.
I wonder if the leak I'm seeing isn't the steering pump but the EBCM (not likely but I will look). I've been working 13 hr days and have no time for anything. With a hurricane coming, I think I know what I'll be doing this weekend... I really hope that the 2005 goes through the "center learn" routing at startup because that would eliminate the steering error into this whole equation. 0.3-0.5 thrust angle can't be enough to give me that many issues. I could feel the front brakes modulating in every corner. And no codes or warnings other that the Active Handeling on the DIC.
More to come.
Drifting
Joined: Apr 2006
Posts: 1,300
Likes: 1
From: Clear Lake Tx
St. Jude Donor '11
Hey Sean
Here are some pages out of my 2006 Service Manual:
I think there are only references to 0.2 volts or 4.9 volts, and some resistance values.
Below are some pages out of my 2010 manual:
You can see that there's only sparse reference to voltage and resistance values - in 2009 they changed to a BOSCH ABS and the diagnostics are different than for your older Delphi ABS.
However, here's some description of the VSES/AH from the 2010 manual, and as far as I know this initialization of both systems are similar:
On that last page above (5-44) it says:
Also, it says:
This indicates to me that the system calibrates itself every time you start driving the car.
So.....the sensor is calibrated at the factory, and only requires calibration on the car if a new one is installed; and the sytem does an initialization procedure when you start the car and begin to drive it, so the system knows what the "zero" position is (I guess a straight ahead steering wheel postion for the SWPS).
Good luck!!!
Bob
Here are some pages out of my 2006 Service Manual:
I think there are only references to 0.2 volts or 4.9 volts, and some resistance values.
Below are some pages out of my 2010 manual:
You can see that there's only sparse reference to voltage and resistance values - in 2009 they changed to a BOSCH ABS and the diagnostics are different than for your older Delphi ABS.
However, here's some description of the VSES/AH from the 2010 manual, and as far as I know this initialization of both systems are similar:
On that last page above (5-44) it says:
Also, it says:
This indicates to me that the system calibrates itself every time you start driving the car.
So.....the sensor is calibrated at the factory, and only requires calibration on the car if a new one is installed; and the sytem does an initialization procedure when you start the car and begin to drive it, so the system knows what the "zero" position is (I guess a straight ahead steering wheel postion for the SWPS).
Good luck!!!
Bob
I am having issues with a newly installed sensor throwing the service active handling as soon as the car is started (before it is even moved) and I am thinking it needs to go through a calibration? Just not sure how to do it