Man I hope it isn’t the module itself. I have to get it inspected before the end of the year. So I am trying to get this fixed. Hopefully once the new sensor is in, the light will go out. It is only throwing a 44 code right nowThe air bag module on my 1993 Coupe was coding a sensor issue and it turned out to be the module itself. These are timing out like the ECU's and about the only place I know of you can send one to get refurbished is here:
Airbag Computer Modules New, Used, Exchanged or Repaired. Airbag Systems, Inc.
Since 1995, Large Inventory of New and Used Airbag Computer Modules. Exchange and Repair Service also availiablewww.airbagsystems.com
Not yet. I ordered a RH crash sensor. If that doesn’t work, or if I get a new code, then I will look into a temp registration.Have you checked with the inspection station or referee about a temporary registration pending repair?
The gear ratio and tires are same as what came in the vehicle. No changes there.VSS is used for cruise control and idle strategy in the ECU. The speedo is mechanical so when they are off that much usually due to a rear end gear ratio change. +/-5 mph is typically a tire size change.
To correct the speedo you need to know the tire size, rear gear ratio, and the speedo drive gear tooth count. The speedo drive gear is the gear on the output shaft of the transmission which on 1993’s is most likely a 7 tooth. Once you know this info you can calculate the number of teeth on the driven gear. This gear is the one on the VSS.
TCI Auto Speedometer Gear Calculator - TCI® Auto
Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. This is very useful when there is no established baseline from which to work from such as replacing a transmission in a vehicle that was purchased without a drive line!www.tciauto.com
If you do not know what gears are in the rear end here is how you can figure that out:
Blog | Articles & Videos | Modern Driveline
View the Modern Driveline blog for helpful articles, videos, and DIY resources. We are your trusted source for everything manual transmission conversion.www.moderndriveline.com
So I checked the tires and they are the standard size that came on them 245/45 R 17 and the rear end is 3.08. I see that they came with a standard 20 tooth gear. I did order a speed sensor but it does not come with the 20 tooth gear. I’ll have to pull mine and see what kinda shape it’s in. Attached is what I ordered for the speed sensor.The VSS is used for cruise control and for the ECU to know that the car is moving vs stopped. The speedometer is mechanically controlled by a gear. If it’s off by 10mph then the tire size has been changed or the gear is incorrect or something has affected the magnetic head in the speedo affecting its accuracy.
As for the crash sensors…swap them. See if the code goes to the other sensor. If it’s does you know it’s faulty. If it doesn’t, it could be a wiring issue.
Also, the AIrbag module suffers from bad caps like the ECU. At this point I assume all airbag modules need a recap and a new thermal fuse.
I have the Carfax for Law enforcement login info and I can vouch that the odometer is correct and the mileage is valid. I thought about ordering the black 20 tooth Speedo gear. I’ll have to take the speed sensor off and look in tranny and see what drive gear is in there. I did verify last night the correct tire size and 3.08 rear end is there.Unfortunately that speed sensor will not affect the speedometer at all. The speedo in the dash is mechanically connected to the trans output shaft. So the gear turns the shaft which turns the speedo cable and so on. A new VSS would be needed if you have a code 29 in which case you would have drivability issues as well...mainly stalling at red lights. The VSS is also used for cruise control but a 1993 cobra doesn't have cruise.
I'd likely return the VSS and instead check your current speedo gear and verify it is in fact a 20 tooth. Also, when you remove the current VSS, shine a flashlight into the trans and look at the speedo drive gear color. Yellow would be a 7 tooth and green/white would be 8 tooth.
A 93 cobra would have an 8 tooth drive gear on the trans (if original). Often times when a trans is rebuilt, folks put in a 7 tooth gear. It's also possible the original trans blew up and someone replaced it with a pre-90 T5 that has a 7-tooth drive gear.
Is the odometer accurate? Can you get a GPS app, hit your tripometer and drive 1 mile and see if the odometer and GPS app match up for distance traveled?
That is a great idea. I wonder how thorough they will be though. I know when you put your key in and either place it in the “run” position or start the car, the Airbag light is supposed to initially illuminate. For some reason, GA does this when transferring a rebuilt title from another state to GA. They make you go through the whole rebuilt process.Can you remove the airbag light so you can pass inspection?
My airbag light is blinking since 2020 and it passed smog every year.
I have the Carfax for Law enforcement login info and I can vouch that the odometer is correct and the mileage is valid. I thought about ordering the black 20 tooth Speedo gear. I’ll have to take the speed sensor off and look in tranny and see what drive gear is in there. I did verify last night the correct tire size and 3.08 rear end is there.
So if the odometer and tripometer is right, but the speedometer needle is off, that means I would have to change out / check the speedometer gear, right?I meant to verify that a standing mile is in fact a mile.
Get on the highway. Turn your gps app and hit mark and set your trip meter to 0. Drive along and see if 2 miles on the gps does come up at 2 miles on the trim meter. That will help be a clue as to what is off with the speedometer. It’s entirely possible the odometer/tripometer is right and the needle is off due to a change in the magnet strength. The odometer/tripometer is purely mechanical by way of gearing off the speedo cable. So if anything in the speedo gear is not right, it will show up here.
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