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A/C unit is blowing warm air

Tiny
ASEMASTER6371
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That was a red/black wire correct?

Roy
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Tuesday, August 11th, 2020 AT 3:52 PM
Tiny
BWILKINSON05
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Roy,
Correct, pin 14 which has a red wire with black line.
Bret
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Tuesday, August 11th, 2020 AT 4:00 PM
Tiny
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Does not make sense. You have replaced the ECM and it still has no power to that pin. Without that power the control side of the relay will not work.

Roy
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Tuesday, August 11th, 2020 AT 4:45 PM
Tiny
BWILKINSON05
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Roy,

I agree. This is why I reconsidered the climate control module. I'm not pressing this just thinking through the possibility - if the climate control module is not sending enough power to the low side switch/sensor, I have 5v and per the manual I should have 12v, there is not enough power to send a signal back to CCM to the ECM to the high side sensor back to the ECM to trip the relay and then power the A/C compressor clutch.
Would it work to jump a line from the battery to the low side sensor?
Bret
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Tuesday, August 11th, 2020 AT 5:10 PM
Tiny
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Roy,
One other thought, I believe when the compressor relay is jumped it's bypasses the climate control computer and powers the compressor clutch.
Bret
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Tuesday, August 11th, 2020 AT 5:16 PM
Tiny
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No, the power for that wire has nothing to do with the climate control module. It is supplied by the ECM to the pressure sensor.

Yes, correct, jumping 30 and 87 sends direct power to the compressor without the control side of the relay grounding.

Roy
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Tuesday, August 11th, 2020 AT 5:29 PM
Tiny
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Roy,

Any suggestions on additional tests?
Here's a recap of my test methods, with key in on position:
When I tested the low side sensor - using a multi-meter I touched the red lead to the paperclip in connector and black lead to the battery negative post.
Same with ECM pin 14 test - inserted paperclip in back of harness, plugged harness into ECM, red to paperclip, black to battery negative post
Same process with high side sensor.
Was my test correct?
Bret
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Wednesday, August 12th, 2020 AT 8:06 AM
Tiny
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Yes, but the issue is nothing at pin 14.

This leads me back to the ECM again. Let me look for any other information.

Roy
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Wednesday, August 12th, 2020 AT 8:11 AM
Tiny
BWILKINSON05
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Roy,
How do I test the power going into the ECM? See July 11th email with schematic. I believe that's the issue. Pin 14 is line from the ECM to the high side sensor. If you look at the schematic, I would like to test the line from the CCM to the ECM, it's the grey line. I believe I need to remove CCM and back probe the grey line.
Bret
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Wednesday, August 12th, 2020 AT 8:22 AM
Tiny
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If there was no power to the ECM, you would have many other issues and a ton of codes.

The gray wire you told me had 5 volts as it should. Why do you want to check it again? That along with the red/black need 5 volts.

Roy
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Wednesday, August 12th, 2020 AT 8:50 AM
Tiny
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Roy,

Agree. I am referencing the white line in the schematic from 7/11 from the climate control module to the ECM. I would like to confirm that line has power with a back probe test.
Should the low side sensor have 5V or 12V?
Bret
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Wednesday, August 12th, 2020 AT 10:55 AM
Tiny
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You are off track here. The issue is the red/black wire. Neither of those wires have any effect on power to that wire.

Roy
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Wednesday, August 12th, 2020 AT 11:06 AM
Tiny
BWILKINSON05
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Roy,
10-4. What is the power source to the red/black wire?
Bret
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Wednesday, August 12th, 2020 AT 11:46 AM
Tiny
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Again, the ECM.

Roy
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Wednesday, August 12th, 2020 AT 11:49 AM
Tiny
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Roy,
10-4. Should I contact fs1inc and ask for input?
Bret
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Wednesday, August 12th, 2020 AT 11:59 AM
Tiny
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Yes, see if they can get you some information.

Roy
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Wednesday, August 12th, 2020 AT 12:06 PM
Tiny
BWILKINSON05
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Roy,

For testing purposes only, what should the voltage be at the white wire exiting the climate control module connecting to SP205 then to the ECM? What is the SP205? Also, do you have a schematic of the climate control module you can send?
Thank you,
Bret
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Thursday, August 13th, 2020 AT 3:09 PM
Tiny
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I attached the diagram with the white wire. It is serial data. There is no voltage. It is a multiplexing signal.

Roy
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Thursday, August 13th, 2020 AT 3:23 PM
Tiny
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Roy,
What should the readings be at pin #'s: 58 and 43?
Bret
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Thursday, August 13th, 2020 AT 8:17 PM
Tiny
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58 is the serial data line I told you about.

43 is the wire from the control side of the relay. It will have 12 volts there unless the ECM grounds that wire. Then it will be 0.

Roy
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Friday, August 14th, 2020 AT 4:24 AM

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