Sorry for all these emails.

One clue indicating that my harness & ECU may require battery voltage
sent to the hall, is this note in Bentley:  "... early 1993 m.y. did
not have MIL except for California vehicles." Here's the diagram
regarding relevant notes on hall, my notes in red text:

https://lh5.googleusercontent.com/-COI1lc7SRx8/UwekHCclPSI/AAAAAAAAI1U/2ltxtK69oqI/s600/Jetta%2520Hall%25202.jpg

https://lh5.googleusercontent.com/-FuVqVh2HRrc/UwekHLWxkyI/AAAAAAAAI1Y/1RK6Quov9I8/s600/Jetta%2520hall%25201.jpg

Though the MIL pin is present on ECU, there was no wire from ECU to
dash or MIL present in instrument cluster. The ECU, harness and
cluster came from same donor.

Neil.

On 2/21/14, Neil N <musomuso@gmail.com> wrote:
> Hi all.
>
> This is for Motronic on my 2.0 Jetta powered Vanagon. ....
> I had to repair and modify the wiring harness for this engine swap.
>
> Bentley shows a difference in the + reference wiring to the hall. Most
> model years receive ECU supplied +  (5 Volts?), others receive battery
> voltage.

--
Neil n

Blog: tubaneil.blogspot.ca

'88 Westy http://tinyurl.com/c8rlw6p

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG *Gas* inline-VR Engine Swap Group:

http://tinyurl.com/d7gd5ej