Black Magic: The Art of Finding an Aftermarket Calibration
• TIS, then… • Vehicle
Calibration Information (figure 1)
2. Once at the web site, enter the vehicle VIN in the box and press GET CAL ID (figure 2).
3. At the new screen, highlight the controller you wish to check for calibration. Click Next (figure 3).
4. At the new screen you’ll again be able to select the type of calibra- tion information you’re interested in.
5. You also have another choice, which you should take advantage of: Click the box for Complete History, then click Next. This will give you access to all of the cali- brations for the various modules (figure 4).
6. The web site will now display your Calibration ID as a part number. The part number is typically listed as CAL ID on your scan tool. Compare the part numbers from the web site to the CAL ID number on your scan tool to determine if your software is current.
7. The web site also includes the CVN with the part number. On your scan tool you will typically find the CVN with the CAL ID information. Many scan tools include both the CVN and the CAL ID as part of their data list parameters; other scan tools don’t, so you’ll need to choose the OBD-II GENERIC feature and then select MODE 9 to access the information.
8. The CVNs listed on the web site should match the CVNs on your scan tool.
If all of the CVNs match, the
vehicle has a GM calibration installed. If a CVN fails to match, you’re dealing with an aftermarket calibration. If you already have a calibration number and would like to get a CVN to check the calibration number against, place the calibration number in the CVN box on the web site and press GET CVN. The CVN will be displayed for the calibration number entered if it’s a GM calibration. If the display states Error or Invalid Part Number, you prob- ably have an aftermarket calibration. As mentioned before, modifica-
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Figure 3
Figure 4
tions to the calibration will impact your ability to keep these vehicles on the road. Like the dealer, you must protect your business from financial exposure if the vehicle’s torque and horsepower have been modified.
In this instance, a little homework
on your part can pay big dividends in the long run. Until next time, remem- ber: “If there’s a way to do it better, find it.”
GEARS March 2012
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