2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

How To Tell Which Wiring Harness Do I Have

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Old May 4, 2020 | 12:27 AM
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How To Tell Which Wiring Harness Do I Have

I have a wiring harness I've for a while, but I cant remember which FC it was for, I think its for a S5 but dont remember if it was for a n/a or turbo. What do I need to look for to see if its for a s4 or s5 and if its a n/a or turbo
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Old May 4, 2020 | 08:48 AM
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Well if it's an S4 vs S5 the ECU connectors will be different. I don't remember the NA vs turbo differences, but if you search for a conversion write up I know it will be detailed.
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Old May 4, 2020 | 09:24 AM
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From: https://www2.mazda.com/en/100th/
there was also a white tag on it with a number, N326/327 is an S4 NA, N332/333 is a S4 turbo, N350/351 is an S5 NA, N370 is S5 turbo. N374 is a JDM s5 turbo.

if you're just looking at it, the Ecu connectors are S4/S5. the S4 turbo and NA are pretty similar looking, but the T2 will have an extra connector by the TPS for the knock sensor, and the NA won't.
the S5 Turbo has a blue round boost control solenoid connector and a knock sensor, and the NA has two more of the regular colored solenoid connectors.
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Old May 5, 2020 | 12:17 PM
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The tags were gone, but im thinkig S5 N/A, not sure if the harness on the bottom has anything to do with the fc, interior stuff maybe or for a different car?






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Old May 5, 2020 | 12:39 PM
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From: https://www2.mazda.com/en/100th/
i think S4 turbo? Ecu connector looks like S4, i see the Fuel injector resistor connector, which makes it an 86-87. and i think i see the knock sensor connector?


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Old May 6, 2020 | 11:27 AM
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appreciate the help, thanks
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