AFM/ECU signal wire
#4
Boost Pope
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For a '90-'93 car, the airflow signal is a solid red wire that runs from terminal F of the airflow sensor to terminal 2O of the ECU. This is a direct run that does not pass through any intermediate common connectors. For most of its length, the red wire is enclosed in a black plastic sleeve which can make it difficult to identify.
The red/green wire is the intake air temperature signal.
The red/green wire is the intake air temperature signal.
#6
Hey guys, I pulled the harness open on my AFM and as confident as we all are that the red wire is necessary, there is no red wire in it. Every wire colour is present with the exception of a solid red. There is, however, a larger gauge Gry-red in there. I'm wondering if I'm being over cautious by not assuming it's the same wire. Just so everyone knows, I live in Ontario and have a canadian miata. I don't know if that makes a difference in this case but I do know that the DRL/turn indicator wiring differs from the US, UK, and Japanese models. Any knowledgable Kanucks out there with helpfull info? I can't find any canada specific diagrams.
#7
Boost Pope
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Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
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Total Cats: 6,874
Ah, you motley Canadian bastards with your Soviet-style wiring...
Ok, so the AFM has seven wires going to its connector:
The airflow signal is on pin F, which is the second one in from the end.
If you can't tell by sight which end is which, figuring it out is easy. Test with an ohmmeter between ground and the pin in question on the vehicle's harness where it mates with the AFM. The second pin in from the wrong side is ground, so you'll read appx zero ohms.
Ok, so the AFM has seven wires going to its connector:
The airflow signal is on pin F, which is the second one in from the end.
If you can't tell by sight which end is which, figuring it out is easy. Test with an ohmmeter between ground and the pin in question on the vehicle's harness where it mates with the AFM. The second pin in from the wrong side is ground, so you'll read appx zero ohms.
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Zaphod
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10-26-2018 11:00 PM