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Old 15-09-2020, 05:20   #1
svd001
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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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Old 15-09-2020, 09:18   #2
TrickyDick
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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?
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