808 component id and use

[antus]

Vl400 once said he has removed the code for some of the tbi function and repurposed one of them for flex output. Others have said they run 12p on tbi without the loop and with no problems. Im working on a tbi project with a mate at the moment so we are going to find out when we get to key on stage.

[bf6379]

D8 and D9 are linked in a loop for single TBI (low impedance) injector. This is the only diagram Ive ever found that shows it. I am not sure the original source, but one of the 1.6L TBI vehicles.

Could be a 1.6 Astra/Pulsar.

D8 is an analog input. This presents more questions than it answered....

[antus]

could it be a current monitor to implement peak and hold for the low impedance?

[bf6379]

could it be a current monitor to implement peak and hold for the low impedance?

But if D9 is only connected to D8, there would be no current to monitor. Unless I am missing something, the 0.103 ohm resistor is a current shunt. The voltage developed across the resistor is inputted to pins 5 & 6 of U12.

[bf6379]

D8 and D9 are linked in a loop for single TBI (low impedance) injector. This is the only diagram Ive ever found that shows it. I am not sure the original source, but one of the 1.6L TBI vehicles.

The diagram doesn't show either D10 or D3 grounded. So there would be no ground return for the injector circuit.

Maybe it isn't D8 connected to D9. Maybe it is a typo and D3 is connected to D9?

[antus]

Clearly I dont know what Im talking about at this level, but I see U12 is the injector drive IC, so Im wondering if the circuit input is the injector drive side of U12, which loops through to the injsense + and - pins, with the current shunt external, and the analog voltage measurement taken through D8. Or perhaps if thats not fast enough for U12, maybe its a monitor that can throw a DTC if sees the OS sees the circuit running out of spec for too long.

[antus]

Hmm Type-o is possible. This reference talking about $58 code and shows D8 and D9 wired but not to each other.

Interesting thread it also states you can change the sense resistor and FETs to get the 808 to run multiple low impedance injectors.

https://www.thirdgen.org/forums/diy-pro ... 100-a.html

fo those of you looking for the ultimate undehood ECM. the 1228708 is working. heres what i had to do.

You must use a 1228708 memcal.

the chip must be burnt from 04000 stating adress.
the first 000-3fff must be filled with FF if its not the damn thing will wig the hell out. dont ask me im not sure why yet. its gotta be a restart/ memcal pull up pull down vector thing. but it works

do not hook anything at all peiod to the 1x refernce line at all. it will drive the timme module crazy. here is the pinout for running the 1228708 with $58 code.

Warning this is bench tested and run on one vehicle only



connector function wire color
A1 IAC "a" high blu/wht
A2 IAC "b" low grn/blk
A7 IAC "a" low blue/blk
A8 IAC "b" high grn/wht
A9 Coolant fan relay
A11 Wastegate contol
A22 ECM gound blk

B1 Check Engine Light tn/wht
B5 ALDL SERIAL Orange/ pin M @ALDL
B10 Ignition Run/Start Red

C1 +BATT Orange
C3 Bst/Bypass tn/blk
C4 Mat tan
C5 Sensor ground black
C7 +5v REF gray
C9 EST white
C10 sensor ground black
C12 +5 v REF gray
C15 TPS drk blu
C16 CTS yellow
C22 MAP green

D1 Jumper to D5 inj sense [p/h 4 cyl] blue
D4 Jumper to D8 inj sense [p/h 4 cyl] tan
D7 Fuel pump relay grn/wht
D9 Inj 1@4 lt blue
D12 Ing module ground blk/ed
D12 ECM ground black
D13 REF pulse ing module ppl/wht
D14 Inj drive 2@3 lgt green
D16 + BAT orange
D19 ALDL ground blc/wht
D21 ECM ground black


anyways folks there it is. a pinout that makes a commonly avaiable ECM work. you can find these ECM in 89-93 pontiac grans ams with a 2.3 dohc quad 4 also any other w body with a undehood ECM of a simila models yrs should have the same ECM.

dohc quad 4 2.3 underhood ECM in pontiac buick and oldmobile vehicles.


as stated above all things must be done as so to make it work. im gonna ty to find a way to make it run in bank/bank soon enough. i think all of that is being handled VIA a timmer module on the motherboard. so once i find a good input fo the cam sensor ( which should be a hall effect) with a ref pulse ratio of 2ref pulse per one ef pulse ) a simple single magnet 5v hall effect should work. but im not sue how the $58 code will eact to anothe timmer input comming in. i can only verify what ive tested.

If you do this please add your input here.

Also to convert this into a 730 style pinout simply use the 1227727/1227749 conversion chart available on ludis langens webpages. although the egula 1227749 pinout should wok make sure not to add the 1x ref signla getting it mixed. but it should be plug and play.
Sean out and i hope somebody appreciates this.

[antus]

I was at a mates place yesterday and he is doing a delco tbi conversion and had a physical pulsar tbi loom on the bench, and here is the d8 d9 loop. its real!

[delcowizzid]

They are talking about the 1228708 ecu above not 808.

[antus]

This thread is about the 808 from the beginning, just the the post above my image was about a similar ECU trying to figure out the loop. This photo answers the question about if the nissan doc on the previous page was a type-o or not.