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compressor doesn't engage

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Sep 15, 2018, 6:59 AM

Post #1 of 3 (386 views)
compressor doesn't engage Sign In

Hell, everyone, this is a 2008 Honda Fit, the air condition is not working, I know there are a number of things that can cause this, my first attempt was to check if there is enough pressure on both sides and it looks fine, but when I check the three wires that go to the compressor, one is power, the middle one is ground, and third is I think signal wire. my question the ground side i check with my power probe showed me 0.1. is this too much resistance causing the compressor not to engage, my question is what should be the appropriate resistance for the ground circuit. I don't know if I explain my situation right I hope you understand, thank you all.

Tom Greenleaf
Ultimate Carjunky / Moderator
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Sep 15, 2018, 7:31 AM

Post #2 of 3 (378 views)
Re: compressor doesn't engage Sign In

Hi! So you just have a static pressure. Pressures don't tell you how much is in a system just if within limits so you only have one called Static Pressure. That's info.
Better when cold know the temp in the area and compare it to the chart below if lower pressure than was it lists out you are essentially empty then system has defaulted to shut down it would work anyway and would harm it.

Just that as the quick one step test LOW port is enough like checking tire pressure only for now. Exact temp and what is the pressure just sitting there, OK?


Hammer Time
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Sep 15, 2018, 7:48 AM

Post #3 of 3 (366 views)
Re: compressor doesn't engage Sign In

That's not at all how this is wired.

The compressor grounds itself to the engine block. The compressor also has a thermal fuse on the ground side connection.
The power feed is the Blu/red wire after passing through the condenser noise reducer. Test the power terminal of the compressor with your power probe with the key off and if it reads ground, the internal fuse is good. Check for power at the feed with the AC turned on the the engine running.

The other 2 wires go to a thermal protection switch internally. Those wire are connected together when in normal mode. The thermal switch breaks the circuit when overheated,


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

(This post was edited by Hammer Time on Sep 15, 2018, 7:49 AM)

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