Which wire is the ground wire? Boost Pressure Sensor
 

This is for an 88 TII. Click on the link below for the picture. Which one of these wires is the ground wire for the boost pressure sensor? I think the ground wire is the top right pin of the terminal, but there are two wires coming out of that pin. Are both of these wires ground wires? If I splice into them should they be kept separate? Thanks

http://img.photobucket.com/albums/v3...interminal.jpg

Don't waste your time. Regrounding that wire applies to 86 models only.

"Don't waste your time. Regrounding that wire applies to 86 models only."

Ok, are there any additional grounds that you would suggest adding for an 88 TII. Since I grounded the ecu, the 3800 hesitation has gone away, except when I have my lights on. The only other ground I have dealt with so far is the battery ground, and I just cleaned that. Thanks for all the help

http://www.aaroncake.net/RX-7/grounding.htm

Read.

That article says to reground the boost sensor, his question was which wire is the ground. So which is it?

Are you fucking serious?!

Yes I am serious, I have an 88' and there are no "brown/black" wires. Thanks for your attitude though! :icon_tup:

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I see brown wires....... EDIT: "I see brown wires" was sarcasm FYI....

Good call though... Might want to ask Aaron cake. The FSM shows what wires you have. Probably a typo in his write-up. So. my apologies

im planning on regrounding my car this week and imma run an all new ground from my ecu to the block, ecu is located on the passenger side by your right foot right?

86-87 had brown/black wires for sensor gnds. Later cars had pure black. Compare a 86-87 wiring diagram with a 88 and you'll see.

On a 86-87 there should be a brown/red output wire to the ECU, a black/white 12vdc pwr wire, a brown/black gnd wire and a brown/white ref voltage wire.

In some later cars you'll see two wires coming out for a gnd.

The gnd was put on that wire not because of a boost sensor problem, but a afm problem. That plug was just handy I suppose, since you all know that all the gnd wires for the sensors in the engine bay are spliced together inside the EM harness and terminate at pin 2A of the ECU. Yes.

I just used the solid black wire.

Ahh hah! Aaron Cake should update his document. :)

Basically just do as Aaron describes in his grounding article, and bring the factory grounds up to as-new condition. If all the factory ground points are working as they should (i.e. completing electrical circuits with minimal resistance) then adding additional ground wires won't really achieve anything except cluttering up the engine bay.

Like I said, that only applies to 86 models, and was covered specifically in a Mazda TSB. It won't do anything for other years.

The '86 should have a brown/black wire. My '86 has a single black wire, but I think the harness has been changed.

I'd assume that Mazda fixed the issue by adding the 2nd black wire you see coming out of the connector. My '86 only has 1 wire coming from there.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/pressure-sensor-ground-3500-hesitation-fix-572799/

The sensor ground is an '86 only thing. I'll update the article to be more clear.

86-87