Radiator fan wiring?

[missin' 2]

What wire/pin is the fan trigger wire on the ecu?

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[Dave Dunbar]

Connector D2, pin C1. Dark green wire.

Sent from my A110

 

[missin' 2]

That is what I would use to trigger the fan relay when ecu turns fan on? Just double checking.

Thanks for the reply

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[RmvBfrFlght]

It is pin D2 at the ECM connector. Ground it to run the fan on low speed.

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[First-time-turbo-owner]

What is the configuration of the ECM connector .....D2 , c1 , where are these located from top left of the connector.?

 

[RmvBfrFlght]

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[First-time-turbo-owner]

View attachment 227952

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Thank you for the diagram. Do I ground d1 with the ignition on or off to get the fan to turn on? I am trying to figure out why my fan is not coming on at all? Everything on my car is stock and the original parts except fuel pump and hotwire kit.

 

[RmvBfrFlght]

Key-on, engine-off. Grounding that terminal activates the low speed fan relay.

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[First-time-turbo-owner]

Do I unplug both

Key-on, engine-off. Grounding that terminal activates the low speed fan relay.

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Do I unplug both sets of plugs from the ECM to do the testing?

 

[RmvBfrFlght]

You can remove both plugs, then do a key-on, engine-off.

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[First-time-turbo-owner]

Ok, the fan works by grounding the d2 connection.....so now I know the fan is good and works. It does not come on when the car gets up to temp, so what should I replace or check next?

 

[First-time-turbo-owner]

Ahh, I found it. The plug terminals for the delay relay were smash. I guess some tried really hard to plug it in and smashed the shit out of it trying so hard?

 

[First-time-turbo-owner]

Would this be the cause for it to never come on?

 

[RmvBfrFlght]

The delay relay won't case this issue, best to unplug it and leave it in the trunk.

Since the fan runs with terminal D2 grounded, that leaves the ECM. Using a scan tool of some sort it would be best to first check that the ECM is reading the CTS (coolant temperature sensor) correctly. As the connector corrodes the ECM sees that as a lower coolant temperature then the actual temperature.

If the CTS reading is OK, then the likely problem is that the quad-driver in the ECM is bad.

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[outlaw22]

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