I previously had my 3bar MAP sensor wired to PIN90 (Reference Voltgage), based on recommendation, and it showed nothing with the key on. Sensor obviously didn't work with this. I then checked PIN89 (TPS input) and found that it is the expected ~1V with the key on. Some folks felt this was a constant voltage, but it is the variable return voltage from the sensor. Not sure why I went ahead and connected to that pin... brain fart while shoved under the dash.
Where can I get 5V at the PCM? Is it PIN90 and I just wasn't getting a good multimeter reading? I tried it every which way and still couldn't get it to read any appreciable amount of voltage with the key on. Is there another PIN? I'd rather not have to go through the firewall.
Where can I get 5V at the PCM? Is it PIN90 and I just wasn't getting a good multimeter reading? I tried it every which way and still couldn't get it to read any appreciable amount of voltage with the key on. Is there another PIN? I'd rather not have to go through the firewall.
