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speedo question

a friend of mine told me about this thing u do to the speedometer. like you press 3 of the 4 buttons like E/M, Reset Trip and Trip. and something will happen he said itll start throwin codes at you or somethin like that
 

speedo question

Reply #1 –
If you press trip and trip reset it'll make the service light go away:grinno:
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

speedo question

Reply #2 –
Copied from my archives of the "old" site, compliments of [COLOR="Red"]jcassity[/COLOR]

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enter test mode my holding the TRIP RESET button and then turn
the ign switch on.

Cycle thru the tests by pressing the TRIP RESET button. A steady
ton on each with the capital letter "P" being displayed is a passing
test. NO tone with the letter "F" displayed means a test has
failed.

^^note,, no tone and the letter F doesnt actually mean the speedo
has failed. there are further steps involved to reason out why the
step has failed.
Death awaits you all with nasty, big, pointy teeth.

1988 5.0 Bird, mostly stock, partly not, now gone to T-Bird heaven.
1990 Volvo 740GL. 114 tire-shredding horsies, baby!

speedo question

Reply #3 –
its neat,, the speedo itself has its very own on board diagnostic mode and various associated codes if there is a problem.  Comes in handy if you are all digi dash.  It allows you to troubleshoot the entire dash cluster. and the speedo.