Ideas for 4 cylinder MPFI = Toyota 22RE with GM ECM?

[1project2many]

Some S10 pickups use the 1X signal. IIRC the FSM says for injector timing.

2X is the reference wire in the 2.2 diagram. Purple / white.
1X is in module but unconnected in car application.

Wiring attached.

[RobertISaar]

Some S10 pickups use the 1X signal. IIRC the FSM says for injector timing.

that would be a curious development.... have a year range to start investigating?

[1project2many]

Robert, I was editing my reply and attaching a wiring diagram as you posted. S10 year is 94-95, I believe it uses 7427 ecm and $0D.

FWIW some of the 2.5 powered S10's had a similar situation. A Hall effect sensor was placed in the distributor and injection wouldn't happen unless that signal was received. I helped an individual who sells remanufactured 2.5 engines and wanted to supply DIS with the engines because reman distributors for that application were getting hard to find and tended to be of poor quality.

[RobertISaar]

neat. i wasn't aware there was hardware in a 7427 to decode what was essentially a cam position sensor, let alone anything that used it.

[EagleMark]

I beleive this is the distributor 1project2many is referencing?

[1project2many]

Aayuh. That's the one.
What's neater than the hardware availability is that it's used in the same code everyone likes for the V8. L31 retrofit, anyone?

[dave w]

Also this 2.x DIS, on the 6 pin plug is only 5 wires. The other was never used. I'm wondering if any other models wiring ever used that pin for something?

Pin B is the unused pin...


EDIT: And which wire from 8708 to 2.x DIS for Reference? Like I said the Quad 4 has
1. 2x ref hi
2. 1x ref hi
3. Ref lo

The Quad 4 and 2.x DIS both have Ref Hi circuit 430 PPL / WHT wire.
The Quad 4 and 2.x DIS both have Ref Low circuit 453 BLK / RED wire.

I would try using Pin "B" from the 2.x DIS for the 1x signal to the 8708 ECM. I have no clue what Pin "B" is supposed to do, but that's what I wanted to bench test.

dave w

[EagleMark]

I would try using Pin "B" from the 2.x DIS for the 1x signal to the 8708 ECM. I have no clue what Pin "B" is supposed to do, but that's what I wanted to bench test.

dave w

IIRC 1project2many said the 1x signal is handled in the DIS ICM. So may not have to try this...

[mecanicman]

This guy did similar project , I thought it was pretty cool.

http://www.hptuners.com/forum/showth...onversion-obd2

[1project2many]

Mark, use the S10 diagram to connect a 1X signal if needed.

The HPTuners conversion could have used a ICM from a later Ecotec. Those modules produce a cam signal by monitoring plug firing voltage to determine which cylinder of a pair is at TDC compression stroke.

[dave w]

Mark, use the S10 diagram to connect a 1X signal if needed.

I agree. I'm thinking Pin "B" of the 2.5 liter Ignition Control Module is a 1x signal. I'm thinking Pin "B" of the 2.5 liter Ignition Control Moudle is Circuit 1579.

Let me know if you need connector part numbers for the 2.5 liter Ignition Control Module?

dave w

[dave w]

Let me know if you need connector part numbers for the 2.5 liter Ignition Control Module?dave w

Connector Delphi Part # 12162260

Connector Pin 18 AWG wire (Pull to Seat) Delphi Part # 12161184

I downloaded the IGS file from Delphi.com

dave w

[EagleMark]

Some S10 pickups use the 1X signal. IIRC the FSM says for injector timing.

2X is the reference wire in the 2.2 diagram. Purple / white.
1X is in module but unconnected in car application.

Wiring attached.

JFYI to this thread this 95 S10 ICM/IDI module is same part number as the early cavilier etc... same part. And the Pin B that is not used, it's plugged but there in earlier versions does put out a 1x signal.

[EagleMark]

Trying to do this while being ill and not thinking well is taking it's toll. Usually I enjoy doing this stuff and would rather work out tuning and conversion issues more then eating or sleep! But right now it's a struggle to think straight and do anything! Also had some issues from another thread:
http://www.gearhead-efi.com/Fuel-Inj...s-it-have-VATS

Just trying to find why it won't run I found a couple wiring issues, one was the buzzing realy. All fixed.

So had the DVOM, timing light and scope out tonight because it's obvious the timing is not right? It will try to start, then crank, then pop through TB... so I'm watching timing with a timing light and it comes on once at about 15 BTDC right where it should be, right? Then once about 20 ATDC, then once about 30 BTDC...

So I'm thinking this used DIS/ICM/IDI is bad and go sit down and watch TV when it hits me? Did I change cylinder count in these bins? So I go look... NO! I can't, the parameter is not there! No dissasemblies to read... remember long ago I wanted to avoid starting with a rarely used mask let alone one with no dissasembly!

$A8 was looking pretty good till this point... I may have to re-pin this to a 7727 and use like $8D and change out the injectors to high impedence, the reason I kept trying to use the 8708 is it is already set for the Low impedence injectors that came in this year Toyota engine...

Any idea of a mask to use in 8708 that has a dissasembly or at least a chance of cylinder count?

[dave w]

I am thinking $8B might be an option. No Cylinder Count with $8B is a BPW parameter like $42.

The attached files are from my bench testing.
dave w