speedometer question

[josua]

Since I bought this eldo, (96'), the speedometer has been off about 10-15 mph. It's reading faster than I'm actually going. Guage, sender in tranny? Everythings stock, tires, wheels. etc. Is there an adjustment?
Any help appreciated. It's really annoying.

[STSS]

Are you in MPH?

[josua]

It's an analog display, not digital.

[submariner409]

On most of these cars you can change the display from MPH to KmH and vice versa. Owner's manual.

In my STS the feature is in a dashboard "ENG/MET" button. Your car may need a setting in the DIC programming to be changed - it's DIY, though.

[josua]

Thanks Sub, I'll check it out.

[chubbyranger]

If the odometer reading says KM after it you are in metric.

[chp350]

once back in 1997 my etc was reading inaccurate, your car has two speedometer readings, using the onboard computer make the mph read in the digtal display where your temperature,fuel and codes are displayed..my speed was reading 18 mph lower at the needle compared to the other speed reading displayed..mine was a bad instrument cluster and was replaced under warranty along with a certified letter from the dealership to give to the judge to help on the speeding ticket that i had gotten.

[josua]

I checked the display, it's in mph. Any other suggestions?

[josua]

chp350, howd you go about getting your digital display to show the speed?

[chp350]

Josh,..see sticky notes at the top...how to pull codes...dont remember from sitting here at the home computer but if I was sitting in the car I could tell you exactly how to do it..I know you will enter into the ipc? to do it ..If you dont figure it out or someone on here with a better memory than me dosn't post exactly how to do it I will tommorrow when I drive the etc.

[chp350]

Josh, do you still need to know how?

[josua]

chp350, yeah I still need to know how to do that.

[josua]

Forgot to mention, I know how to pull the codes.

[submariner409]

This is a stretch, but take a look at the tire spec sticker on the driver's door - are the tires on the car the correct size ?

Tire size has a distinct effect on speedometer accuracy.

[N*Caddy]

Here is something to check:

Enter in diagnose mode (Ignition ON – engine can be either on or off - and press and hold Pas Warmer & AC OFF until all dashboard lights and display elements will light up – IS OK don’t be alarm is just to test if working - it is called segment text).
Focus your attention to the IPC display strip (where you read your trip, the odometer and the messages like “Apply break to …”). The display will show some codes like “B1234 History”, or “NO RFA CODES” with a frequency of one every 2 – 3 seconds. Either wait until the display will show “PCM?” or just press FAN SPEED DOWN (i.e. NO) to skip the codes display sequence.

Here are some general instructions:
FAN SPEED DOWN = NO
FAN SPEED UP = YES
A/C OFF = EXIT CURRENT MENU
TURN IGNITION OFF = END ALL (you can do this at ANY time, say if you are lost)

Now let’s return…
When you see on the display “PCM?” press FAN SPEED DOWN (NO) to get to the next menu (“PCM?” means “Do you want to enter in the PCM menu?” and your answer is NO – FAN SPEED DOWN).
Press NO until the display will show “IPC?” witch in fact is the next menu after PCM (so you only need to press NO once. But should you accidentally pass the IPC menu NO biggie, just press NO until the “IPC?” menu will show up again. The menus are enumerated in a circular manner (once you got to the last one the first one is displayed as next). The menu sequence is: PCM, IPC, ACM, SIR, TCS, RSS, PZM, IRC, RFA, CCP, MSM, MMM, PHN (not all menus are available, some are options that may or may not equip your vehicle).
So you see “IPC?” on the screen ( i.e. “Do you want to enter in the IPC menu?” Your answer should be YES) press FAN SPEED UP to enter in the IPC menu.
Once in the IPC menu you will be prompted: “IPC CODES?”, “IPC DATA?”, IPC INPUTS?” “IPC OVERRIDES?”. Press NO (FAN SPEED DOWN) until “IPC OVERRIDES?”.
“IPC OVERRIDES?” press YES (FAN SPEED UP). And then press NO (FAN SPED DOWN) until IPS02 OPTION B. In 1-2 seconds the IPS02 value will be displayed where your trip odometer usually displays.
IF your speedometer is in miles the correct value you should read is 0 (ZERO), if in KM should read either 1 - Norway/Sweden, 2 - Canada, 4 – Saudi Arabia, 8 – Japan and 16 - Europe.
If it doesn’t match then change the value using the PAS WARMER - red (+1) and PAS COOLER – blue (-1).
Please MAKE SURE you only use the values mentioned above (or else you will need a new IPC). Once the proper value set press and HOLD the Front Defrost (Symbol) and A/C OFF buttons until the value flashes (in about 3 seconds).

Should you be lost at any point turn the ignition OFF and then start all over.
Once the value flashed it means it was STORED so you can turn the ignition OFF or press A/C OFF until you get to the beginning of the diagnose mode (i.e. the segment test), then while all lights are on press again A/C OFF to exit the diagnose mode.

You did mentioned you know how to put codes, but I posted the full procedure in case somebody else needs the same thing and does not know how to pull codes.