MS3Pro PNP 95 Miata A/C Control-Good relays, a/c clutch engaged, no fan....
1995 Miata with MS3Pro PNP the a/c clutch engages, but the A/C Fan does not engage. Idle up works fine and main fan kicks on below Fan Control Temps. Just need the A/C to come on so I can cruise.
I started by removing the A/C relay and it bench tested fine. Energized properly with good continuity through the relay. While the engine was running and the A/C compressor running I tested the wiring inputs to the relay. Both power wires to the hot side relay(BLU/Y) and solenoid wire (BLK/WHT) were showing 12+V. When I attached the BLU/WT wire to the relay, it did not energize the relay solenoid. I checked the BLU/WT for ground and it was open. I've reviewed both the Miata stock wiring diagram and Megasquirt documentation and can find no control or I/O for this part of the circuit. Does MS3Pro PNP control this circuit? Appreciate any insight before I start inventing work arounds. Yours truly, Just4Fun....Smitty |
If I recall the default control outputs are swapped, I believe Inj J controls the compressor clutch and Inj I controls the passenger side fan.
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Thank you for your insight. I will try a test mode for those outputs and see what happens.
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cpierr...well the hint paid off. Inj I was not assigned in the I/O pins. Ran a test mode on that I/O and the ac fan relay buzzed. Went into advanced setting/programmable I/O and set Inj I to reference coolant sensor such that it turns on at 80 degrees +- 3 degrees and fan kicked on. Reset the reference to >199 degrees.
Hit the highway with A/C, hwy temps at 95, engine held temps between 203 and 204 for 30 min at 70 mph. Thanks again for the hint! Just4Fun |
Yep, I had the same problem, just couldn't remember how I fixed it :). Glad you got it sorted!
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