Evo 6 with Evo 7 ECU Aircon Issue

svd001 · 15-09-2020, 06:20

Hi All,

Recently purchased an Evo 6 with reflashed Evo 7 ecu.

Issue is, the AC compressor is not getting power to engage and the fan does not turn on.

All fuses checked.

Just had the system purged and refilled and leak checked today, all ok there.

If you remove the AC and condensor fan relay covers and engage the relays by hand, the system functions as it should with the compressor engaging and the fan turns on, then cools the air.

I checked and only PIN 8 and 22 have been swapped at the ECU. Could that be causing the issue?

Everything else looks ok.

TrickyDick · 15-09-2020, 10:18

Looks like 8 and 22 swap is correct however the control signals from the A/C dash switch and Heater-A/C ECU module are also different so maybe that's not compatible? Some different magic going on with the serial control signals?

15-09-2020, 06:20	#1
svd001 Registered User Join Date: Sep 2020 Posts: 1	Evo 6 with Evo 7 ECU Aircon Issue Hi All, Recently purchased an Evo 6 with reflashed Evo 7 ecu. Issue is, the AC compressor is not getting power to engage and the fan does not turn on. All fuses checked. Just had the system purged and refilled and leak checked today, all ok there. If you remove the AC and condensor fan relay covers and engage the relays by hand, the system functions as it should with the compressor engaging and the fan turns on, then cools the air. I checked and only PIN 8 and 22 have been swapped at the ECU. Could that be causing the issue? Everything else looks ok.

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15-09-2020, 10:18	#2
TrickyDick Very Senior User Join Date: Jul 2006 Location: Surrey Car: VII FQ-300x2 Posts: 1,041	Looks like 8 and 22 swap is correct however the control signals from the A/C dash switch and Heater-A/C ECU module are also different so maybe that's not compatible? Some different magic going on with the serial control signals?