Which wire is the ground wire? Boost Pressure Sensor
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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
http://img.photobucket.com/albums/v3...interminal.jpg
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"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
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
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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
Last edited by micah; 06-18-07 at 09:49 PM.
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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.
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.
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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.
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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/
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