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St205 engine fan


pat90

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Somebody knows If The oem ecu of Toyota switches The engine fan with 12volt? I have a Link ecu but The link doesnt switch The engine fan. We changed The fan wire to another pin(injector6)  in The connector en in The ecu changed settings but with no succes, If we put 12V in The pin The fans start running, I think we must couple a relay to iT to switch. I think iT a little strange for such expensive ecu that this not works Like oem?

 

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1 hour ago, pat90 said:

I think iT a little strange for such expensive ecu that this not works Like oem?

The fan on the ST205 is not even controlled by the ECU as far as I know?  They normally just have a thermo switch in the radiator. So it should work exactly the same as OEM with the Link ECU.

 

If you want to change your car so that the fan is controlled by the ECU, then you will need to change the relay wiring so that it can be triggered by a lowside (ground) signal.

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16 minutes ago, pat90 said:

Ok:) but in The ecu I can set al temps when they start running etc, is that only for expansion relays then?

Those settings are used by the ECU only if you have an aux output set to "engine fan" and that aux output is connected to the fan relay.  Just like the ECU has settings for VVT, it does not mean all cars have ECU controlled camshafts.

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5 minutes ago, Adamw said:

Those settings are used by the ECU only if you have an aux output set to "engine fan" and that aux output is connected to the fan relay.  Just like the ECU has settings for VVT, it does not mean all cars have ECU controlled camshafts.

Allright:) The Aux output is 5volts, so I need a relay with 5v and 12v then?

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