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Old 07-03-09, 08:07 PM
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Cadillac(s): 1997 Cadillac STS
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Location: Toronto, Canada
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Re: speedometer question

If your option B value is set to 0 your speedometer should be in miles. If that’s the case check to have the car set to Imperial (not metric). If is set to imperial (i.e. Miles on the IPC and degrees Fahrenheit on your climate control) and your speedometer is lopsided the chances are very high that your IPC is defective.
You can eliminate everything and be sure that the IPC is the culprit by bringing your speed on the display. If you don’t have the instant speed in the options scrolled with the INFO button then add-it to the menu.
Here is how:
Follow my instructions up to IPC OVERRIDES.
Then instead of going to option B, go to option E (use the same buttons FAN SPEED UP/DOWN, AC OFF, FRONT DEFROST (the symbol), PASS WARMER/COOLER)
Once in option E and VERY, VERY important make sure you write down the value shown where the trip odometer usually shows (again after 1-2 seconds). Remember that value, take a picture, write it down (is important).
Now to add the speed display in the menu ADD 4 (four) to the initial number.
So let’s say your value is 43 (factory default) to add the instant speed display to the menu add 4 (i.e. 43+4=47). Use the same buttons PASS WARMER (+1) and PASS COOLER (-1). Once you have the new value use the same FRONT DEFROST (symbol) and A/C OFF to store the value (same as mentioned before press and hold until the value flashes).
Then exit from this menu as I mentioned before either turn the ignition OFF or press repeatedly A/C OFF until you get to the segment test and when all lights are on press one more time A/C OFF and you are out of the diagnose mode.

Now using your INFO button scroll to the options until you get to instant MPH.
Drive the car and compare the digital display with the analog display.
If no match your needle actuator is bad, if match then you might have a PCM or speed sensor issue (inside the transmission).