anyone know what this black plug is?
 

hey guys,

the black plug is part of the loom that down the right hand guard

[IMG]http://img514.imageshack.us/img514/4958/getattachmentaspxjq.jpg[/IMG]

[IMG]http://img62.imageshack.us/img62/1444/65465x.jpg[/IMG]

v4 sti dccd loom. also looks like it has thermal wrapping on a few of the wires.

any help appreciated.

dan

Possibly for diagnostics, pretty sure my V3 has the same thing just hanging there too.

nah its not the diagnostics plug,

bit of an update, ive got a standard v4 wrx wiring main harness laying around and it turns out the black plug fits into this one.

[IMG]http://img41.imageshack.us/img41/3064/dsc00688small.jpg[/IMG]

now the wiring loom that i hate in the car (v4 sti dccd) does not have this.

hmmm any ideas? test light and trace it?

the wrapping on the wires is a special sheilding to help stop interference from emi. could be for a speed sensor for the engine, or air flow meter, something with a really small and critical signal

getting closer. i did a bit with the test light.

i started tracing the plug on the v4 wrx non dccd main loom with a test light and this is what i found.

[IMG]http://img504.imageshack.us/img504/760/dsc00694g.jpg[/IMG]

so by using these pinouts

[url]http://www.polarperformance.co.uk/MY97-98PinOut2.html[/url]

[url]http://www.northursalia.com/modifications/misc/wiring/v3and4-1.jpg[/url]

pins 4 and 5 on the ecu are data check connectors.

hmmmmmmmm