[Diy_efi] Bosch Analog injection

[Bill Washington]

Torbj?rn,
    Thank you for the partial LU2 schematics a while back - I am still 
struggling to find time to get stuck into them, however, on the same topic,
    do you have a listing of the function of the adjustment resistors in 
the LU2 Jetronic?
Best Regards
Bill

>
> Subject:
> Re: [Diy_efi] info request
> From:
> Torbj?rn Forsman <torbjorn.forsman at gengas.nu>
> Date:
> Tue, 22 Aug 2006 15:40:57 +0200
> To:
> diy_efi at diy-efi.org
>
> To:
> diy_efi at diy-efi.org
>
>
> The method of full-load enrichment is very different among the various 
> D-jetronic implementations out there.
>
> The oldest one is using a vacuum switch which shorts pin 2 or 9 to pin 
> 14 of the ECU at full load, this will change a bias voltage to the 
> monostable that is controlled by the pressure sensor. In this case, 
> decreasing the resistors R207/R208 or R208/R209 (parallel connected) 
> in the ECU will give more full-load enrichment.
>
> The next method is using a non-linearity in the pressure sensor, by 
> fitting an extra membrane in addition to the usual "barometer" bellow. 
> In this case, there is a sealed adjustment screw in the pressure 
> sensor which sets the limit of travel for the membrane and hence the 
> full load enrichment.
>
> And the newest method is using a WOT switch, like more modern Bosch 
> systems. It is connected in approximately the same way as the old 
> vacuum switch, and there are the same reference numbers of the 
> resistors to be altered.
>
> However, please note that the pinouts of the D-jetronic ECUs are not 
> all the same. There is a lot of small differences and it is always 
> safest to refer to a wiring diagram for the actual car you are working 
> on and then double check that the car's wiring harness seems to be 
> wired like the schematic. The full load enrichment resistors in the 
> ECU have always one end connected to the pin for the vacuum/WOT 
> switch. A good thing is that in most cases, all wires in the harnesses 
> are marked with the corresponding pin numbers of the ECU, so it is 
> relatively easy to reverse engineer a D-jetronic harness and make an 
> own wiring diagram.
>
> Best regards
>
> Torbj?rn Forsman
>
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