3.4 Conversion to DIS runs with problems (Page 2/3)
DMax OCT 23, 05:08 PM
So, this is wath I did a few minutes ago:

I disconnected the tach wire, and started the car again => SES light comes on
I added some extra grounds => now the ground wire has 3 connections: engine, firewall and battery => start the car again, SES light comes on
I also rerouted the spark plug wires, so they are as far as possible from the wiring of the ICM

Connected a multimeter to the bypass wire => voltages of about 0.02v , but no 5 volts.
So I guess the ECM does not take over for the ignition reference....

Since the injection works, and I get a tach signal in tunerpro, I believe I can conclude that the ICM sends a reference signal to the ECM....

Anyone who knows what the contidions are for the ECU to not take over the ignition and set code 42?

grtz, D

edit: this is what happens when I start:
After about 1 second, the engine rpm rises a little bit
1 second later, the SES light comes on.

[This message has been edited by DMax (edited 10-23-2017).]

phonedawgz OCT 23, 05:19 PM
Are you referring to the Red/Black Ref low wire? That should run directly from the ECM to the ICM and should not be grounded.
DMax OCT 23, 05:25 PM
No , I referring to the 2 pin connector that supplies the power to the ICM.
I spiced that ground wire, and connected it to 3 different places.

The black/red wire is connected to the wires of the 4pin connector of the distributor

grtz,D
phonedawgz OCT 23, 08:27 PM
http://photos.app.goo.gl/JRCpBnZE7NAitQ6k1

http://photos.app.goo.gl/gX4IERrzMaI0UXw12

http://photos.app.goo.gl/hx8BrzWLi5Gz8wyx2

The third page has a paragraph that lists the four conditions that will cause a code 42.

Is this how you have the ECM wired to the ICM?

http://photos.app.goo.gl/3dumM2aLoeQaPc6h1

1990 Firebird has a connector that you disconnect to set timing by the heater box. That opens up the bypass circuit. Is that plugged together? Also check right at the ECM pin to see if the ECM is putting +5v on the wire right there. Remove the blue terminal retention clip and backprobe the terminal.

[This message has been edited by phonedawgz (edited 10-23-2017).]

DMax OCT 24, 06:34 AM
The connections from the ICM to the ECM are Ok, I checked them several times.
Tomorrow, I'm gonna mearure the resistance of the wires between the ECM and the ICM.

Must the baseplate of the ICM being grounded?
I mounted this baseplate to het firewall, it should normally have ground, but I did not pay special attention to it.
Ask this question because I see that the icm tester ground the metal plate of the ICM to test it....

Do the 2 white wires of the ICM have the same signal?
Because if so, then i could pinpoint the search to why the ECM does not send an EST signal....

is there a setting in the bin, that can change the EST signal in a way that code 42 wil set...

grtz, D

[This message has been edited by DMax (edited 10-24-2017).]

DMax OCT 26, 09:53 AM
measured the resistance of the wires between the ICM and the ECM

they all are near zero

The ecm doesn't put 5v to the bypass wire on the ECM side...

The 2 white wires on the ICM seems not to be connected to each other..

for the moment, this is what I think:
the ECM is not putting the signal on the white wire, and therefor, it also does not put 5v to the bypass..
I just cannot find out why...
Because there is no signal on the white wire, I also get no tach signal

Try to score a oscilloscope, to see if there is a signal on the white wire, coming from the ECM...

Is there a way to test the tach, just to be sure this one is ok?

grtz, D
DMax OCT 28, 12:08 PM
Got myself a third ICM today..

While connecting the wiring, I saw that the wire from the crack sensor was at A and B of the connector, C was blocked. (connector of the 3.4 V6)
I changed the wires, and put the crank sensor on A and C
I made no difference....
I measured between B and C of the 'old' ICM, they seems to be internally connected to eachother and to the ground, so explains why the sensor on the 3.4V6 is connected between A and B...

I also bought a little pulse generator, to test the tach.
When set to 50hz, the tach says 1000 rpm (V6 => 6 pulses for each 2 rpm => 3000pulses for 1000rpm + 50hz => 50/s => 3000/min)
So the tach works

Seems not logic to me that 3 different ICM have 3x the same problem.... While none of you guys seems to have had the same problem......

I'm running out of idea's..... Please someone???

grtz, D
DMax OCT 29, 04:08 AM
Now it is getting weird.....

today I put in the original AZTY bin that works with the distributor....

It runs (ok, it surges a lot...)
but no code 42, no SES light, nothing....

with a little bit throttle, it stalls, but stil no SES light....

WTH????
phonedawgz OCT 29, 04:11 AM
Are you custom burning your chips or just running them stock?
DMax OCT 29, 06:21 AM
I was using some A1 bin files from the gear-efi forum that i Bieber tot some chips..

stupid spelling control on the smartphone....

=> I was using some A1 bins from the Gear-Efi forum that I burned on some chips.

[This message has been edited by DMax (edited 10-29-2017).]