Miata Specific research:
MS3x A/C Jumper - Please verify
AC input circuit:
1Q -> Active Low Input Circuit > DIP40pin10 > JP4 > PEO
AC output circuit:
1J -> Relay Control Circuit (1K, TIP120, IN4001) -> AD6
Firmware = ms2extra_3.3.2
Startup/Idle > Air Conditioning Idle-up
Idle-up Input Polarity=Low
Idle-up Min RPM=0
Compressor Delay Since Last On(s)=0
Idle-up Duty Adder(%)=17.4
Tested mods on Stim: Output grounds when Input goes low
Confirmed that grounding 1J causes AC compressor clutch to engage
Confirmed that 1Q is going to ground when AC sw is on and Fan on 1
Intermittent grounding behavior on 1Q when AC sw is on and Fan on 2.3.4. This is odd as blower, AC, and fans work correctly when 1Q and 1J is jumpered?
Proposed next steps:
I need to verify the expected behavior on 1Q so I can confirm or deny the possible wiper issue on fan switch dial.
Follow up Questions:
Can somebody point me to a (confirmed) diagram or description of what we are supposed to be seeing on 1Q on a 91?
Servaas (Relte's Brother)