YAW RATE Sensor.....
Thread Starter
Race Director
Joined: Oct 1999
Posts: 17,712
Likes: 1,220
From: Phila PA, Bonita Springs FL
YAW RATE Sensor.....
OK..
While flooring it yesterday, with Traction Control "ON", I noticed the light came on in the dash...
Pulled the codes & got:
1221H
1222H
Speed Sensor Input is 0
&
1282H Yaw Rate Sensor Bias Circuit Malfunction
No change in driveability, while the little light was on.
Was able to clear the codes & the light went out after shutting the car off & then starting it back up again.
TC seems to come on & off properly..
Now, I didn't notice a "spin" when I floored it.
Any idea what may have popped these codes, and should I be concerned since I was able to clear them?
Thanks,
Ellis
While flooring it yesterday, with Traction Control "ON", I noticed the light came on in the dash...
Pulled the codes & got:
1221H
1222H
Speed Sensor Input is 0
&
1282H Yaw Rate Sensor Bias Circuit Malfunction
No change in driveability, while the little light was on.
Was able to clear the codes & the light went out after shutting the car off & then starting it back up again.
TC seems to come on & off properly..
Now, I didn't notice a "spin" when I floored it.
Any idea what may have popped these codes, and should I be concerned since I was able to clear them?
Thanks,
Ellis
Last edited by YO-EL; Feb 21, 2005 at 08:11 AM.
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
Ellis: Yaw rate sensor input works with your abs system to help manage over steer and under steer by applying brake pressure to compensate at the correct wheel..
Standard on every Corvette, the Active Handling System can actually help correct the vehicle’s direction if the car is not accurately responding to steering input. By combining yaw-rate sensors, the ABS and traction control systems, AHS compares the steering wheel position with Corvette’s actual direction and applies any of the four brakes to help compensate for difference. The system can be switched off and has a special mode for use in sanctioned competitive events.
I hope this helps... it could have been a momentary glitch, or the sensor itself is bad.. when your yaw sensor demand is active you will see the display "Active Handling"
Bill aka ( E-T )
Standard on every Corvette, the Active Handling System can actually help correct the vehicle’s direction if the car is not accurately responding to steering input. By combining yaw-rate sensors, the ABS and traction control systems, AHS compares the steering wheel position with Corvette’s actual direction and applies any of the four brakes to help compensate for difference. The system can be switched off and has a special mode for use in sanctioned competitive events.
I hope this helps... it could have been a momentary glitch, or the sensor itself is bad.. when your yaw sensor demand is active you will see the display "Active Handling"
Bill aka ( E-T )
Thread Starter
Race Director
Joined: Oct 1999
Posts: 17,712
Likes: 1,220
From: Phila PA, Bonita Springs FL
Yea Bill..
The only thing was, was that I was on a straightaway I-95, and once I floored it, the TC light did come on & the DIC message "SERVICE ACTIVE HANDLING", but TC did NOT kick in... I was still flyin!
Maybe TC was supposed to be kick in for some reason & it failed?
Usually the TC light only comes on for me when I take TC off...
All seems normal now... But with this weather, it will be a little while before I am able to got WOT on the road.. I ususally take TC off, but this time, I was just cruisin to get the car hot & feel what the new cam felt like..
The only thing was, was that I was on a straightaway I-95, and once I floored it, the TC light did come on & the DIC message "SERVICE ACTIVE HANDLING", but TC did NOT kick in... I was still flyin!
Maybe TC was supposed to be kick in for some reason & it failed?
Usually the TC light only comes on for me when I take TC off...
All seems normal now... But with this weather, it will be a little while before I am able to got WOT on the road.. I ususally take TC off, but this time, I was just cruisin to get the car hot & feel what the new cam felt like..
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
If your sensors detected some lateral steer while in WOT, or the back end got squirrelly, you may not have noticed it... but the system may have.This system works in micro seconds.,.,
Burning Brakes
Joined: Dec 2004
Posts: 1,234
Likes: 2
From: New Jersey
DTC C1221 LF Wheel Speed Sensor Input Signal is 0
DTC C1222 RF Wheel Speed Sensor Input Signal is 0
DTC C1282 Yaw Rate Sensor Bias Circuit Malfunction
The ECU was not getting a signal from either front wheel speed sensor (WSS) or from the yaw ("spin") sensor. Bias is basically "output" in degrees.
The chances that all 3 went bad at the same time is near 0. Sounds like either EM interference, a bad ECU, bad ECU harness or ECU connector. Or just a bad ground.
It could have also just been a "hiccup" or ghost reading and it will never happen again.
The sensor cluster, which has the yaw sensor, can give you a hiccup if it takes a nice jolt.
And yeah the AH responds in a max of 300ms (millisecond - one thousandth of a second ) usually much faster, around 100ms, the blink of an eye is 100ms.
This is not the same as when it responds, just how fast it can be once it does.
Typical system, number 1 is mounted in many different place from car to car, but the rest are basically dictated by practicality and physics:
DTC C1222 RF Wheel Speed Sensor Input Signal is 0
DTC C1282 Yaw Rate Sensor Bias Circuit Malfunction
The ECU was not getting a signal from either front wheel speed sensor (WSS) or from the yaw ("spin") sensor. Bias is basically "output" in degrees.
The chances that all 3 went bad at the same time is near 0. Sounds like either EM interference, a bad ECU, bad ECU harness or ECU connector. Or just a bad ground.
It could have also just been a "hiccup" or ghost reading and it will never happen again.
The sensor cluster, which has the yaw sensor, can give you a hiccup if it takes a nice jolt.
And yeah the AH responds in a max of 300ms (millisecond - one thousandth of a second ) usually much faster, around 100ms, the blink of an eye is 100ms.
This is not the same as when it responds, just how fast it can be once it does.
Typical system, number 1 is mounted in many different place from car to car, but the rest are basically dictated by practicality and physics:
Last edited by Mighty-Mouse; Feb 21, 2005 at 11:25 AM.
