Vehicle speed sensor
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Race Director
Joined: Aug 2003
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From: Lake Mary Florida
Vehicle speed sensor
A friend who owns a 07 ZO6 asked me the other day where were does speed information come from. I didn't know off the top of my head.
I looked in my FSM's thinking this is probably a similar design between C5 and C6, and noted that wheel speed sensors are integrated into the hub on each wheel.
Is this also where vehicle speed information is determined from these wheel speed sensors?
Do you suppose this will be similar on next gen models?
I looked in my FSM's thinking this is probably a similar design between C5 and C6, and noted that wheel speed sensors are integrated into the hub on each wheel.
Is this also where vehicle speed information is determined from these wheel speed sensors?
Do you suppose this will be similar on next gen models?
Tech Contributor
Joined: Jan 2007
Posts: 19,360
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From: Dyer, IN
A friend who owns a 07 ZO6 asked me the other day where were does speed information come from. I didn't know off the top of my head.
I looked in my FSM's thinking this is probably a similar design between C5 and C6, and noted that wheel speed sensors are integrated into the hub on each wheel.
Is this also where vehicle speed information is determined from these wheel speed sensors?
Do you suppose this will be similar on next gen models?
I looked in my FSM's thinking this is probably a similar design between C5 and C6, and noted that wheel speed sensors are integrated into the hub on each wheel.
Is this also where vehicle speed information is determined from these wheel speed sensors?
Do you suppose this will be similar on next gen models?
Thread Starter
Race Director
Joined: Aug 2003
Posts: 13,421
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From: Lake Mary Florida
Ok that makes sense. I looked throughout the FSMs '01 and you'd think there'd be a index marker for speed odometer, or speed sensor but nope! LOL I didn't see anything under vehicle speed sensor, so when I came across wheel speed sensor I knew it was part of the ABS but had no idea if it was like the old style systems with the speedo sensor in the transmission.
So it still is these days as well. Thanks.
So it still is these days as well. Thanks.
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The VSS is used for different purposes than the wheel speed sensors. Also trying to extract vehicle speed from the wheel sensors would be tricky as there are times when each sensor is showing a different wheel speed than any of the others. This can happen on turns, bumpy road sections, etc.
Bill
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From: Dyer, IN
Ok that makes sense. I looked throughout the FSMs '01 and you'd think there'd be a index marker for speed odometer, or speed sensor but nope! LOL I didn't see anything under vehicle speed sensor, so when I came across wheel speed sensor I knew it was part of the ABS but had no idea if it was like the old style systems with the speedo sensor in the transmission.
So it still is these days as well. Thanks.
So it still is these days as well. Thanks.
Thread Starter
Race Director
Joined: Aug 2003
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From: Lake Mary Florida
I'll look tonight but there should be a corresponding schematic for the transmission side. Thanks for the schematic, that shows the signal from the PCM to the cluster. Need to see the VSS to the PCM. I bet this is in the two blue Transmission FSMs. I'll look a little more in those tonight when I get home. I should have looked there first!
The conversation got started because C6 Z drivers have such limited tires they can use. Couple manufacturers have a 345/30-19 over the OEM 325/30-19. And the question was what affect on the speedometer accuracy would there be when going to an oversized tire. We figure maybe a 1 mph delta.
The conversation got started because C6 Z drivers have such limited tires they can use. Couple manufacturers have a 345/30-19 over the OEM 325/30-19. And the question was what affect on the speedometer accuracy would there be when going to an oversized tire. We figure maybe a 1 mph delta.
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
Nope, the replacement of the VSS is located in the service manual, under "rear drive axle", not the transmission overhaul manuals. The VSS output to the cluster, and the VSS(sensor) are on the same diagram I attached....look again. What isn't shown is the VSS output from the PCM to the ESCM.
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From: Van Buren Arkansas
Wounded Warrior Escort '11
I've got an '07 and I have the manuals but I'm at work right now and will have to look in the morning. The C-5's, the speed info comes from a connector on the transmission. I'm guessing its the same on the C-6, but not sure.
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Thread Starter
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From: Lake Mary Florida
That's good to know that they are similar.
I wonder if swapping the OEM tire on either vehicle and going to larger size tire if that will affect the accuracy of the speedo readings.
Going from 325's to 345's, and I was curious where the sensor was at, I could only find wheel speed sensors on my '01 FSMs.
I believe the VSS is a worm gear type sensor.
I wonder if swapping the OEM tire on either vehicle and going to larger size tire if that will affect the accuracy of the speedo readings.
Going from 325's to 345's, and I was curious where the sensor was at, I could only find wheel speed sensors on my '01 FSMs.
I believe the VSS is a worm gear type sensor.
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Wounded Warrior Escort '11
Thread Starter
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From: Lake Mary Florida
Now we figured that it would be about a 1 mph difference by going to a larger size tire. Anyone have any experience with that?
Z06 guys have limited choices on tires.
