72* outside, Active Handling Warming Up!?!?!?
Thread Starter
Le Mans Master
Joined: Nov 1999
Posts: 6,456
Likes: 2
From: D/FW Area TX
72* outside, Active Handling Warming Up!?!?!?
This isn't the first time I've seen this on my 2002. My 1999 only did this when it was really cold outside.
It's 72* outside right now. I was driving back from the mall and stopped at the gas station to get a Coke. I was only in the store for about 2 minutes. The store is right around the block from where I live. I left the store, and as I pulled into my gate, the Active Handling Warming Up message came up and then I got the warmup finished message almost immediately after. This happened about 1 minute after I left the store while the car was moving. It's 72* outside, I had just been driving it, the coolant was at 200* so should I be concerned that something on my Active Handling system is malfunctioning/going out? This is about the 3rd time my 2002 has done this when it's dry and warm outside. The last time it did this was about 1 1/2 months ago.
Any ideas?
Thanks.
It's 72* outside right now. I was driving back from the mall and stopped at the gas station to get a Coke. I was only in the store for about 2 minutes. The store is right around the block from where I live. I left the store, and as I pulled into my gate, the Active Handling Warming Up message came up and then I got the warmup finished message almost immediately after. This happened about 1 minute after I left the store while the car was moving. It's 72* outside, I had just been driving it, the coolant was at 200* so should I be concerned that something on my Active Handling system is malfunctioning/going out? This is about the 3rd time my 2002 has done this when it's dry and warm outside. The last time it did this was about 1 1/2 months ago.
Any ideas?
Thanks.
Thread Starter
Le Mans Master
Joined: Nov 1999
Posts: 6,456
Likes: 2
From: D/FW Area TX
Re: 72* outside, Active Handling Warming Up!?!?!? (ICULUKN-C5)
Hmmm. I just took her out for a quick ride and it did it again immediately after I turned around the corner. Come to think of it, the first time it did it today was also when I turned around the corner. In both cases, I was only doing about 2-3 mph and the corner was 90*. I'm a little concerned now that it did it twice in the same day.
Thanks for the input. I guess I'll have to have the blue bowtie techs check this one out for me.
Thanks for the input. I guess I'll have to have the blue bowtie techs check this one out for me.
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
Re: 72* outside, Active Handling Warming Up!?!?!? (Tiger Shark)
Same thing happened to me....It was right after I installed the Vortex Intake.....
I forgot to plug the IAT sensor back in. :crazy:
You may have a bad connection or a bad sensor
I forgot to plug the IAT sensor back in. :crazy:
You may have a bad connection or a bad sensor
Safety Car
Joined: Dec 1999
Posts: 4,202
Likes: 2
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (Tiger Shark)
If I'm not mistaken, it's really not related to temperature. Each time you start the car, the AH will go through a startup cycle. The car needs to be driven straight during this time.
If you start the car and are turning the steering wheel as you move, it interrupts the cycle. I believe that's when you get the message.
I could check my service manual for the details, if you need them.
If you start the car and are turning the steering wheel as you move, it interrupts the cycle. I believe that's when you get the message.
I could check my service manual for the details, if you need them.
Drifting
Joined: Oct 2000
Posts: 1,598
Likes: 1
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (TooManyIDs)
I'm assuming right now it's because I put new wheels on the car and haven't trained the sensors yet. They use the computer inputs from the wheels for wheel speed etc for the AH controls.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Safety Car
Joined: Dec 1999
Posts: 4,202
Likes: 2
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (K&B Motorsports)
...trained the sensors yet....
I don't get the warm-up message when my CCW's are mounted.
[Modified by TooManyIDs, 10:09 PM 2/24/2002]
Drifting
Joined: Oct 2000
Posts: 1,598
Likes: 1
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (TooManyIDs)
Did you move the sensors from the stock wheels to the new ones? How long was it in between the move of the sensors from the stock wheels to the new ones.
I'm just guessing here, so anybody else is welcome to chime in cause I certainly don't have a definitive answer, but Do have the problem.
Bill
I'm just guessing here, so anybody else is welcome to chime in cause I certainly don't have a definitive answer, but Do have the problem.
Bill
Safety Car
Joined: Dec 1999
Posts: 4,202
Likes: 2
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (K&B Motorsports)
Do you mean the tire pressure sensors? No, did not install a set on the CCW's. I swap the wheels for racing, don't leave them on.
What does that have to do with AH calibrations?
What does that have to do with AH calibrations?
Melting Slicks
Joined: Nov 2000
Posts: 2,380
Likes: 0
Re: 72* outside, Active Handling Warming Up!?!?!? (TooManyIDs)
If I'm not mistaken, it's really not related to temperature. Each time you start the car, the AH will go through a startup cycle. The car needs to be driven straight during this time.
If you start the car and are turning the steering wheel as you move, it interrupts the cycle. I believe that's when you get the message.
I could check my service manual for the details, if you need them.
If you start the car and are turning the steering wheel as you move, it interrupts the cycle. I believe that's when you get the message.
I could check my service manual for the details, if you need them.
I've gotten this message before without having swapped out wheels. (Got it on the way home from the dealer on DAY 1!) :DJC
Drifting
Joined: Oct 2000
Posts: 1,598
Likes: 1
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (TooManyIDs)
I don't know every sensor on the car, but the AH system get's a lot of input from tire sensors, gyro's and physical input sensors to determine when the car is not doing what you want it to. I've had wierd codes anytime I change wheels which don't have sensors. My new wheels have not had the sensors trained yet, so I'm getting a butt load of code in the AH arena.
Safety Car
Joined: Dec 1999
Posts: 4,202
Likes: 2
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (K&B Motorsports)
The AH system gets part of its input from the wheel speed sensors. They are on the hub, follow the wiring harness. I'm not aware of the tire pressure sensors having anything to do with it.
I'm assuming the AH error messages are due to the change in tire diameter, as we swap wheels. In my case, the diameters drop, so my wheels are rotating faster than normal. The rotation speed front to back is also altered, as the fronts are 1" shorter in diameter, while the rears are .7" shorter.
I don't know if the AH programming is based on absolute rotation or relative rotation front to back, but either way, my wheel swap will upset it.
The code I'm getting is:
C1226 LF Excessive Wheel Speed Variation
The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 10 mph or more in 0.01 second. The change must occur 3 times with no more than 0.2 seconds between occurrences.
I'm assuming the AH error messages are due to the change in tire diameter, as we swap wheels. In my case, the diameters drop, so my wheels are rotating faster than normal. The rotation speed front to back is also altered, as the fronts are 1" shorter in diameter, while the rears are .7" shorter.
I don't know if the AH programming is based on absolute rotation or relative rotation front to back, but either way, my wheel swap will upset it.
The code I'm getting is:
C1226 LF Excessive Wheel Speed Variation
The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 10 mph or more in 0.01 second. The change must occur 3 times with no more than 0.2 seconds between occurrences.
Thread Starter
Le Mans Master
Joined: Nov 1999
Posts: 6,456
Likes: 2
From: D/FW Area TX
Re: 72* outside, Active Handling Warming Up!?!?!? (TooManyIDs)
The AH system gets part of its input from the wheel speed sensors. They are on the hub, follow the wiring harness. I'm not aware of the tire pressure sensors having anything to do with it.
I'm assuming the AH error messages are due to the change in tire diameter, as we swap wheels. In my case, the diameters drop, so my wheels are rotating faster than normal. The rotation speed front to back is also altered, as the fronts are 1" shorter in diameter, while the rears are .7" shorter.
I don't know if the AH programming is based on absolute rotation or relative rotation front to back, but either way, my wheel swap will upset it.
The code I'm getting is:
C1226 LF Excessive Wheel Speed Variation
The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 10 mph or more in 0.01 second. The change must occur 3 times with no more than 0.2 seconds between occurrences.
I'm assuming the AH error messages are due to the change in tire diameter, as we swap wheels. In my case, the diameters drop, so my wheels are rotating faster than normal. The rotation speed front to back is also altered, as the fronts are 1" shorter in diameter, while the rears are .7" shorter.
I don't know if the AH programming is based on absolute rotation or relative rotation front to back, but either way, my wheel swap will upset it.
The code I'm getting is:
C1226 LF Excessive Wheel Speed Variation
The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 10 mph or more in 0.01 second. The change must occur 3 times with no more than 0.2 seconds between occurrences.
Safety Car
Joined: Dec 1999
Posts: 4,202
Likes: 2
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (Tiger Shark)
The warm-up message is a normal occurrence (see your owner's manual).
My post on the TCM error message was not meant to relate to your situation, I was just responding to Bill.
Sorry for the confusion.
[Modified by TooManyIDs, 11:32 PM 2/24/2002]
My post on the TCM error message was not meant to relate to your situation, I was just responding to Bill.
Sorry for the confusion.
[Modified by TooManyIDs, 11:32 PM 2/24/2002]
Drifting
Joined: Oct 2000
Posts: 1,598
Likes: 1
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (Tiger Shark)
I kept the same wheel sizes (except for width) as I put Z06 wheels on the car. Whatever is causing it is actually setting the MIL.
Bill
Bill
Safety Car
Joined: Dec 1999
Posts: 4,202
Likes: 2
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (K&B Motorsports)
I kept the same wheel sizes (except for width) as I put Z06 wheels on the car. Whatever is causing it is actually setting the MIL.
Bill
Bill
Drifting
Joined: Oct 2000
Posts: 1,598
Likes: 1
From: Plano TX
Re: 72* outside, Active Handling Warming Up!?!?!? (TooManyIDs)
Don't know.
I'd have to measure to be sure. We put the Toyo's on the back(295/18/40), and Nitto 555's on the front. When Toyo brings out the 275/17 I'll put them on the front.
Bill
I'd have to measure to be sure. We put the Toyo's on the back(295/18/40), and Nitto 555's on the front. When Toyo brings out the 275/17 I'll put them on the front.
Bill