7MGTE starting issues --- Again...

[Negative Boost]

Thanks Rudi. I just connected it the correct way around with +12v to the positive LED leg and put the -ve leg to the ECU CEL wire. Still didn't work. There is an external resistor on the LED.

[RA35GT]

ahh much bugger.

Did ya check to see the LED will turn on when the -ve leg is brought to ground? If it works, Its possible that the CEL output is FUBAR on the ECU?

Can you borrow another ECU (where the CEL does work) and see if it works ? (I know you have done this before, but with a functioning CEL, you might be able to get some codes out of it to help you with the diagnosis).

[Negative Boost]

LED does work if the -ve leg is bought to ground.

I tried the spare ECU and the CEL dosn't work with that one either. Surely the CEL output isnt fubar on both ecus.

[RA35GT]

Yeah man, would be extremely unlucky to have two ECU's with fubared outputs...

Is pin E1 on the ECU grounded? This is used to provide the earth to the transistor that controls the Check engine light. (You can check this at the diagnostic connector dood)

Thats really the only other thing i can think of man.

[Negative Boost]

I'm afraid it is grounded. Ah well, thanks very much for your help mate. I might have to take it to a sparky.

[wilbo666]

Transmission. The car is manual but the ECU and Engine was Auto. I have shorted the auto plugs 2 and 3.

Have you checked that you have +12v on the NSW pin on the ECU?

But the wierd thing is, it starts without these shorted anyways?????

Yeh if you're using your existing starter wiring, which you prbly are it will start fine without it!

Cheers
Wilbo

[Negative Boost]

Yup, +12v on the NSW pin on the ECU regards if the NSW plug pins 2 & 3 are shorted or not.

I'm actually using the 7M starter wiring. Should i try using the existing starter wiring (i think its still there hiding somewhere).

[Negative Boost]

Tried my existing (stock) starter wiring and that made no difference. Everything was still as it was before.

[cambelt]

NSW makes no difference to starting if its grounded or not.
Dave

[cambelt]

Its input is to idle the engine up when put into D or R
dAVE

[Negative Boost]

Ah, well that explains that then. Thanks cam.