karDoel Posted March 2, 2021 Report Share Posted March 2, 2021 i manage to connect the fan to relay and connect fan control aux, so the ecu turn on the fan when ect reach certain temperature, the problem is when engine killed with key off the relay is switching on, and the fan running, any advise how to resolve this? tried to zeroin speed lock out and zero rpm.. doesnt work honda link ecu plug in HC92+ thanks Quote Link to comment Share on other sites More sharing options...
Confused Posted March 2, 2021 Report Share Posted March 2, 2021 The power supply to the relay coil must come from an ignition switched feed. It is then grounded via the ECU to turn the relay on. Aux outputs are grounded when the ECU is powered down. I'm guessing that your relay coil is permanently powered directly from the battery, hence the fan comes on when you switch off the key. Quote Link to comment Share on other sites More sharing options...
karDoel Posted March 2, 2021 Author Report Share Posted March 2, 2021 ahhh... my head turn on.. all sorted out.. thx ! Quote Link to comment Share on other sites More sharing options...
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