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s5 tII wire engine wire harness question....

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Old 03-31-11, 06:52 PM
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IN s5 tII wire engine wire harness question....

so here it goes. i dont know what a couple of the wires are for on the s5 TII harness.

*the first wire from the fire wall has a female spade connector (dont know what it is for)

the second set is fuel injectors and ground wires

the third set is tps, air intake temp sensor, ground, and knock sensor wires

the fourth set is fuel injectors and coolant thermo sensor wires

the fifth set is crank sensor and solenoid valve wires

*the sixth set is electrical omp wires and next to them are 3 wires (black 1 wire connector with a yellow center, a white 2 wire, and a black 2 wire) dont know what they are for

the seventh set is fuel pump priming connector

the eighth set is boost/pressure sensor and green check connector

the last one is the mass air flow meter plug

please inform what the unknown plugs are for, thanks!
Old 03-31-11, 10:48 PM
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I'm gonna Bump this Up,so maybe somebody can See this and Post up PICS of an Unmolested S5 TII harness,with labels pertaining to each connector.
It'd be about the only way you will find you what goes Where.(I've never heard of the harness wires in "sets"..it is usually just one big *** harness with alot of connectors!).
SO,someone,Help this Guy..It's your duty as an FC owner!!!
Old 04-01-11, 01:36 AM
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first is probably a ground or oil pressure sensor condensor

2nd might be ACV
Old 04-01-11, 06:19 PM
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i found out what the first wire is: coolant temp sensor.

how do i know which one is the 02 sensor plug?

also, how am i supposed to run my windshield wipers if the TII harness has no plug for them?
Old 04-01-11, 06:57 PM
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or he can post pictures of each connector himself. i do not find it my duty to dig out a harness, take pictures of each connector and label them for someone.
Old 04-01-11, 07:33 PM
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here is what i came up with:





Old 04-01-11, 08:14 PM
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3rd picture looks like the water temp sender wire, which has a bullet connector adapter for an S4 sensor, the S5 coolant temp sensor had a flat blade style connector.

4th picture is the knock sensor connector

5th picture top is ACV bypass solenoid connector, bottom left is BAC connector, and lower right is the O2 sensor wire. S4 O2 sensors had a square plug similar to the knock sensor connector but on the opposite side of the engine.

i have never seen a main harness with only 2 ECU connectors on the engine harness. something is strange with your car definitely.
Old 04-01-11, 08:20 PM
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RIGHT ON MAN!!!

thanks for the help which was very much needed. i appreciate your patience and help alot.....
Old 04-01-11, 08:22 PM
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oh, and the 3rd ecu plug is an in cabin harness connector. that is how all of my rx7's have been
Old 04-01-11, 08:23 PM
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no problem.

i looked and thought there was supposed to be a third but theres only 2, the other 1 ties into the dash harness. the FD has 3 harness plugs and 1 dash connector so 4 in total.

Last edited by RotaryEvolution; 04-01-11 at 08:26 PM.
Old 04-02-11, 11:16 AM
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ok, so rotaryrocket88 is telling me that i pretty much need to rewire the turbo harness since it wont match up to my turbo ecu......? if all of my car was n/a, and then i swithed EVERYTHING to TII, wont it work properly without any kind of mods?
Old 04-02-11, 11:59 AM
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Originally Posted by blackrotary23
i found out what the first wire is: coolant temp sensor.

how do i know which one is the 02 sensor plug?

also, how am i supposed to run my windshield wipers if the TII harness has no plug for them?
Take the harness in your pictures and throw it in the ash can and reinstall your non turbo harness. EM harness is the name.
Old 04-02-11, 02:03 PM
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jspec harness. get as stock harness.
Old 04-02-11, 02:27 PM
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so what is different between the jspec and the us harnesses other than there is no wiper motor connector and it is set up for right hand drive?

also, with the n/a harness, what wires need to be re routed?

is the automatic n/a harness the same as the 5 speed harnesses?
Old 04-02-11, 02:28 PM
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i have a jspec ecu that has been chipped by knight sports as my TII ecu that i am using...
Old 04-02-11, 03:54 PM
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ok. i am getting tired of messing with this.

i really could use some help guys.

i have an n/a automatic harness. i have a TII ecu jspec chipped by knightsports.

i need to know exactly what wires i need to mess with in switching around to get my car running. this is my only car (daily driver) and i really need to get it moving soon. my wife is getting pissed at this whole ordeal.

i guess what i am asking is: if i am going to use the n/a harness for my turbo ecu, what do i need to do to the harness to make it work with my ecu? i know i have to swap around some wires and whatnot, i already extended all the wires necessary to all parts under the hood. i need to know what wires need to be cut and rerouted to where they need to be for the TII ecu.
Old 05-04-11, 06:35 AM
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Originally Posted by blackrotary23
ok. i am getting tired of messing with this.

i really could use some help guys.

i have an n/a automatic harness. i have a TII ecu jspec chipped by knightsports.

i need to know exactly what wires i need to mess with in switching around to get my car running. this is my only car (daily driver) and i really need to get it moving soon. my wife is getting pissed at this whole ordeal.

i guess what i am asking is: if i am going to use the n/a harness for my turbo ecu, what do i need to do to the harness to make it work with my ecu? i know i have to swap around some wires and whatnot, i already extended all the wires necessary to all parts under the hood. i need to know what wires need to be cut and rerouted to where they need to be for the TII ecu.
i am as lost as u are...although i am quite interested in your finding...hopefully someone here can answer this question...as i am about to endure on an S5 T2 swap myself...

good luck...and please post what u've found...
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