Ac control module

[DavsR]

Question for the forum. My ac control module behind the glove box reads 1.5v on the air thermo sensor while the electrical diagram shows that this should be a 5v signal. My question does this mean my AC control module is no good? I have an extra control module and both read the same voltage.

 

[holeshotmoe]

Last summer I went through the electrical first. I seem to recall something suspicious measuring the voltages too. Like you, I had a spare giving the same results. But the system worked fine after I found and fixed the broken capillary line on the expansion valve. But assuming the schematic is correct, yes, pin 22 is supposed to supply 5v. Did you measure it with the sensor unplugged? And check the other two 5v outputs...pins 12 and 21. Also check the other voltages according to the troubleshooting tables on the pages after the schematic you're probably looking at. Then test the sensor. Those steps are there too. Tomorrow after work I'll try to get you a measurement from mine, connected and not.

 

[DavsR]

Thanks so much for the response holeshot, I've tested the circuit connected only and I'm not getting a voltage back from the air thermo sensor. I am seeing 6v+ from the air inlet sensor and the freon temp sensor (freon temp sensor not returning voltage). I think I need to replace compressor since freon temp sensor isn't something I can replace alone. I'm using the circuit diagram for the galant and I'm not seeing any testing protocals.