Helping a coworker with their Miata. I've been through the diagnostic tests multiple times with this car.
car had no A/C, did a bit of troubleshooting and found It had corroded/broken wires at both the compressor and condenser fan relays. I replaced the broken wires, connectors and relays. Recovered the refrigerant, evacuated the system and refilled it just to make sure we had a proper charge. Cranked the car up and hit the A/C button with no compressor engagement. I was puzzled so I started doing voltage and continuity tests. At this point Everything has passed, but the PCM just isn't grounding the relays. I was suspecting the thermostatic switch, but I have power at the A/C fan relay. When bypassing the PCM and grounding the relays, I have A/C. Is it common for the PCM to fail on these cars? I never had a problem with any of the PCMs on the NAs I've owned.
Anything I'm overlooking or should retest?