urgant help needed with ABY not starter

[steverrquattro]

RPM Sensor?

Testing a G4 is something like this: "Test the resistance between between pins 1 and 2 of the black connector end of the G4. (With the bump on the middle of connector up, the pins are, left to right, 1 ,2 and 3.) Between 1 and 2 you should have "approximately 1000 ohms".

If NO = replace, If YES - test between pins 1 and 3 and then 2 and 3. Both should be infinite ohms, i.e. "open", If NO = replace. If the G4 is fubar'd the engine will not start. If the engine is running when the G4 fails, it will keep running, but never start again (until you replace the G4).

[flat out 90]

Am I right in assuming that the ecu has to see up to 19 rpm from the G28 before starting but once running uses other sensors to stay running? If so do you think bump starting might show the ecu way more than the required rpm hence tricking the ecu into thinking the engine is running via the other senors ?

That’s what iv been working on but not sure how

[flat out 90]

RPM Sensor?

Testing a G4 is something like this: "Test the resistance between between pins 1 and 2 of the black connector end of the G4. (With the bump on the middle of connector up, the pins are, left to right, 1 ,2 and 3.) Between 1 and 2 you should have "approximately 1000 ohms".

If NO = replace, If YES - test between pins 1 and 3 and then 2 and 3. Both should be infinite ohms, i.e. "open", If NO = replace. If the G4 is fubar'd the engine will not start. If the engine is running when the G4 fails, it will keep running, but never start again (until you replace the G4).

Thanks for the info I’ll tray again I have tryed another on it but I’ll test it

[Henkjan]

what's the voltage during starting?

[flat out 90]

what's the voltage during starting?

10.9 vs

[flat out 90]

RPM Sensor?

Testing a G4 is something like this: "Test the resistance between between pins 1 and 2 of the black connector end of the G4. (With the bump on the middle of connector up, the pins are, left to right, 1 ,2 and 3.) Between 1 and 2 you should have "approximately 1000 ohms".

If NO = replace, If YES - test between pins 1 and 3 and then 2 and 3. Both should be infinite ohms, i.e. "open", If NO = replace. If the G4 is fubar'd the engine will not start. If the engine is running when the G4 fails, it will keep running, but never start again (until you replace the G4).

Checked all that with no luck done the test and everything

[flat out 90]

So another update I’m not sure if it should happen so I’m looking for someone to confirm this

so with the ignition on a get 12.49 volts on pin 3 of the ecu.
but when I crank the car I get 0.66 volts. Now looking at the diagrams this is the power to the ecu Is this correct. If someone can confirm it before I carry on with it please.

[newsh]

Sounds wrong to me
This is probably why it starts when you bump it

[flat out 90]

That’s what iv been think now just to find out why it’s doing it

[Lago Blue]

Is it possible that a faulty alarm might only cut power to fuel and spark when you are trying to crank; and not when you are simply in run?

[jeffstoo]

How about bridging from +12v supply to ignition fed supply at ecu and see if she goes when you turn the key?

[flat out 90]

How about bridging from +12v supply to ignition fed supply at ecu and see if she goes when you turn the key?

So tryed that and no difference.

[flat out 90]

So I know things get warm but the ecu is getting to warm I would say.

Can anyone one tell me what I should get out of pin50 on the ecu. It’s for the Speedo with the ignition on I get 9.52 volts but if I unplug the clocks I get 6.32volts. I’m not sure what I should be getting there that’s why I thought I would ask.

[flat out 90]

Is it possible that a faulty alarm might only cut power to fuel and spark when you are trying to crank; and not when you are simply in run?

Do you mean a standard alarm or aftermarket one.

[Lago Blue]

After-market, I didn't see what type yours was but (upon seeing jeffstoo's post), recalled a post about internal alarm fault:

https://www.s2forum.com/forum/techni...62#post1215362