A/C ecm wiring for idle

[Justin71105]

Make sure pin 55 has a good ground, had a few times the past few days where it would stumble and I would see on the scanner that AC Active and AC clutch enabled would turn off with AC request still on.

I have a stud on firewall I am using as a ground for my engine harness and put that ring connector on it from pin 55 on ecm. Found when I tightened the connector it got pulled into the washer I have against the firewall and wasn't making great connection.


The wire is fairly small 22ga and the ring connector is a 5/16- 16ga I have a bunch of. Solved this problem today, I made a new wire to go between ecm and that ground, crimped the connector on for ecm and soldered as well, did the same for the ring terminal. Used a smaller inner diameter washer for firewall so it wouldnt get pulled into the hole when I tightened. May order some 1/4 - 22 ga ring terminals if it becomes an issue later on. But after soldering it in I think it will be fine.

Ran VCM scanner and did not lose those two values at all while I had the AC request.

I also adjusted the Base running airflow in gear up 0.8 g/s for my normal running temp and this looks to have taken care of the stumble in reverse with a/c on and off.

Will take it out later and make sure but it did even just pulling up driveway and backing down I had no issues like I did earlier this week.

The loss of ground (closed) signal to ecm caused it to turn off ac clutch and deactivate ac like it was low on freon.

This also caused the ecm to drop the idle assist I get even though the AC request was still active since that is a standalone 12v wire from VA wiring.