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'Re[2]: [OT] Water injection (was: Question for phy'
1998\06\17@110749 by Martin Green

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    Many cars have a way to read the EEC codes without requiring any
    special hardware, usually by flashing instrument panel lights in a
    sequence that tells you the code. You usually have to short some pins
    on a special connector (on my 1991 Cressida it is in the engine
    compartment), then do something such as turn the ignition key to a
    particular position to initiate the dump of the code. I know that many
    Ford and GM products have this feature, on these cars the dedicated
    EEC reader is just a convenience.

    Check out a shop manual for your vehicle (it won't be in your owners
    manual) before you go to the trouble of building any hardware.


    CIAO - Martin.


______________________________ Reply Separator _________________________________
Subject: Re: [OT] Water injection (was: Question for physics person)
Author:  pic microcontroller discussion list <spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU> at
Internet
Date:    6/17/98 7:34 AM


I am having the same problem on a ford 95 escort,  got the Chilton repair
manual and the codes are listed for the EEC and am thinking about building a
full scale readout using the 16F84 and a display.  the manual shows you how
to use a VOM and read(?) the needle swings as a readout of the code.
later......chuck

> {Original Message removed}

1998\06\17@185247 by Dennis Plunkett

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At 10:57 AM 17/06/98 -0400, you wrote:
>     Many cars have a way to read the EEC codes without requiring any
>     special hardware, usually by flashing instrument panel lights in a
>     sequence that tells you the code. You usually have to short some pins
>     on a special connector (on my 1991 Cressida it is in the engine
>     compartment), then do something such as turn the ignition key to a
>     particular position to initiate the dump of the code. I know that many
>     Ford and GM products have this feature, on these cars the dedicated
>     EEC reader is just a convenience.
>
>     Check out a shop manual for your vehicle (it won't be in your owners
>     manual) before you go to the trouble of building any hardware.



Not quite so! On the older versions (Pre 1992) the Error code produced was
simply the highest error current (Often that error also had to be present).
If however you use a resistor between the pins (3k9 or 10k) depending on the
mode that your after, the ECU will enter what is called the high diagnostics
mode (Dumps the stuff out at around 160 baud) in this stream are all the
error codes or the rich lean mode. The dumb slow mode if for the normal
boffins to do simple stuff, there is one example where the same error code
is produced that indicates the ECU is stuffed or the DFI is stuffed, use the
high diag mode and it will tell.

PIC PIC PIC PIC PIC PIC PIC PIC PIC PIC, there that should satisfy those
whom think that this information is [OT]


Dennis

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