3b s2 coupe resurrection

[twoqu]

I think its a bit confusing as Paul N used 0V instead of ground or earth.

[andy10v]

33 is n75, and working during output test.

30 is the one that said ground but appears to be a 0v reference.

[newsh]

Pin 33 or Pin 30?

[newsh]

http://www.s2central.net/S2_Schematics/B/B73-05.pdf

[andy10v]

S2 central says 0v ground for G61, G66. G69, F96, G62, G42 on an ABY.

[newsh]

That's 3B anyway..

[andy10v]

If you're sure that pin is supposed to be grounded then why not try grounding it!

Because I dont want to break something.

I am not sure if it is a ground? Daves list says

"30/55- Ground for ECU and ECU sensors - G/BK (See details with a listing of the seven devices grounded through Pin T55/30)"

Which makes it sound like the ecu uses it as a ground, the above diagram makes it look like its part of a signal circuit? S2central says it is a 0v reference signal for a pile for F96 , G42 , G61 ,G62, G66, G69

[newsh]

Actually in this diagram it shown as not connected I think, it's a bit small on my laptop..

I am not clear if 33 is a ground, or a ground reference? This diagram does not show it as a ground, but a 0V reference signal.

[andy10v]

Grounding points behind dash are usually quite high up on the A pillar, a bolt with a load of rings on, sometimes these go rusty where water drips down.

Cheers, got them to the left of the heater box.

[andy10v]

I am not clear if 33 is a ground, or a ground reference? This diagram does not show it as a ground, but a 0V reference signal.

[newsh]

If you're sure that pin is supposed to be grounded then why not try grounding it!


BTW it could be driver's side A pillar.

[newsh]

Grounding points behind dash are usually quite high up on the A pillar, a bolt with a load of rings on, sometimes these go rusty where water drips down.

[andy10v]

The loom then goes up behind the heater box and I cant see where that group grounds.

Is it worth grounding pin 33 or the whole lot to the chassis?

[andy10v]

Pin 33 is black with a purple stripe, it goes into the top group of connected wires (I presume a collection of earths?)

[twoqu]

We need power and earth. So if you don't have one or the other then thats an issue that needs investigating. Although if the ecu itself is not grounded I am surprised some of the output tests worked. Still it sounds like a probable cause.