Have Toyota Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.working after noon till just after midnight.
Here is he diagram I will be using.
The ECM controls the ground to the clutch relay that energizes the compressor clutch.
Do you have access to a scan tool to see if the ECM is getting an AC on command from the HVAC and if the dual pressure switch is grounded?
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Hello again Chris here,
The auto zone tool can only get engine codes. A more sophisticated tool from a shop is needed.
Sorry you felt my diagnostic help was vague. I have to be vague to determine the customers skill level to see if they can even to the diag and repair they are wanting to do.
Without testing any repairs would just be a guess. If you want to try a part, the best choice would be a replacement dual pressure switch.