Read some schematics today, and came up with this table

LH is the Injection box, EZK Ignition box, and TCU is the turbo control unit.. Lots of boxes here!

I have a few questions..

* The "Main relay +" is connected to the same relay output as coil, injector+, IAC solenoid+ and a few more places.. Can i use this wire for injector flyback? The flyback definition is very simple: if it's always connected to injector + (no fuse or switch in between, than yes).

* (air conditioner) ECC Blocking relay, is used to disable ECC at WOT, also disabled for the first 10 seconds after startup. Pie to implement. Maybe enable ECC after passing a certain RPM for the first time? No.

* For the Main Relay coil-, can I have a output that always is driving this after powerup? You can use a wire from VBatt to turn on a FET through a 1k gate resistor. Or the fuelpump relay output.

* To make the box as close to plug'n'play as I can, I have to drive all the (HighZ) injectors with one FET, Should i solder the flyback for HighZ or LowZ with 4 injectors in paralell? Definitely low voltage (0.7 + 0.7V) flyback. Or you can just connect several injector outputs in parallel: than flyback can be DR type too: note that with high voltage DD flyback only the lowest voltage (think about tolerances and temperature->opening voltage function: -2mV/K) would carry most of the current! Solder all the flybacks, but not necessary to solder all FETs (but why not solder at least 2 and drive them both - it really costs nothing).

[A picture of the modified box]

||Name||LH||EZK||TCU||GenBoard||Testing ON/OFF||

||Fan, Fullspeed (relay)||15|| || ||EC36-16||mdh97/mdh17||

||Fan, Halfspeed (relay)|| || ||5||EC36-4||mdh87/mdh07||

||Fuelpump relay||20|| || ||EC36-15||mdhD7/mdh57||

||Main Relay coil-||21|| || || || ||

||ECC Blocking Relay||14|| || ||EC36-31||mdhe7/mdh67||

||Constant VBATT||4|| || || ||

||Ignition +||35|| || ||EC36-25||

||Main Relay +||9|| || || ||

||Signal GND||5|| || ||EC36-?||

||Power GND||17|| || ||EC36-?,?,?||

||CLT sensor||13|| || ||EC36-14||

||IAC solenoid||33|| || ||EC36-17||

||Injector +||18|| || ||EC36-7||

||Knock sensor -|| ||12|| ||extra||

||Knock sensor +|| ||13|| ||extra||

||VR Trigger shield|| ||11 || ||GND||

||VR Trigger +|| ||10|| ||EC36-27||

||VR Trigger -|| ||23|| ||GND||

||Boost solenoid -|| || ||1||EC36-6||

||TPS +|| || ||7||EC36-28||

||TPS Signal|| || ||8||EC36-1||

||TPS GND|| || ||24||GND||

Older LH2.2 pinout (Saab T16 engines)

||LH||Name||

||1||RPM signal||

||2||CLT||

||3||Idle switch||

||4||idle rpm++ for automatic||

||5||GND||

||6||MAF 3||

||7||MAF 5||

||8||MAF 2||

||9||switched +12||

||10||idle valve||

||11||GND||

||12||WOT switch||

||13||INJ||

||14||MAF 6||

||15||?||

||16||AC relay ctrl||

||17||FP relay||

||18||+12V||

||19||check engine light||

||20||O2 signal||

||21||INJ main relay||

||22||Test conn? to 3pole conn||

||23||idle valve||

||24|| ||

||25||GND||