Engine wiring harness connection points and earthing points help please

[Westcoast888]

Hi
Hope you’re all well
I’m desperately hunting a wiring fault that I’m documenting on another thread

Help please Flashing coil light and EML on. Multiple codes 31391 27202 8208 8216 8217 8338

3) Possibly clogged manifold pressure sensor (G31) Captured in fault code freeze frame In blockmap data Should be close to ambient pressure - especially when engine off. This sensor has been replaced with OE item.

www.t6forum.com

But I’m stuck trying to find the following so was hoping a kind soul on here with a bigger brain than me (not difficult!) could shine a light please

So

Earthing point 487 & 486. The wiring diagram states they are in ‘engine pre wiring harness’ which isn’t very clear to me

D121 connection 19 engine compartment wiring harness.

D39 connection 1 engine compartment wiring harness.

I have searched the download section and the web but come up against a wall.

Hopefully this might help others in the future too

Many thanks
Jay

 

[Westcoast888]

 

[roadtripper]

I think those are internal joints in the premade harnesses, not a connector block as you might be thinking.

@mmi or @n10n ?

 

[Westcoast888]

I think those are internal joints in the premade harnesses, not a connector block as you might be thinking.

@mmi or @n10n ?

Ah ok thanks I guessed it was something like that but thankyou for confirming

 

[mmi]

I think those are internal joints in the premade harnesses, not a connector block as you might be thinking.

@mmi or @n10n ?

Correct.

View attachment 260292

I think the wiring diagram "154" is not correct one for your MY18 van, as it covers vans built August-2018 onwards, thus MY19.

The correct one should be "12", as below version 2018 release 9 Jul 2021



Anyways, probably not relevant here but MY19 does have some significant differencies, e.g. two NOx sensors, etc.

 

[Westcoast888]

Correct.


I think the wiring diagram "154" is not correct one for your MY18 van, as it covers vans built August-2018 onwards, thus MY19.

The correct one should be "12", as below version 2018 release 9 Jul 2021

View attachment 260452

Anyways, probably not relevant here but MY19 does have some significant differencies, e.g. two NOx sensors, etc.

Damn! I’ll download the right one! My head is spinning but I’m determined to fix it