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crwdns2930797:0crwdne2930797:0: crwdns2931709:0Check engine light on due to fan system...
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crwdns2933939:0crwdne2933939:0: oldturkey03 (crwdns2933941:0crwdne2933941:0)

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Check engine light on due to fan system not working

The radiator cooling fan is not working properly. I have bypassed its own system installed a aftermarket relay to have the fan working at all times. But now the check engine light is on with a code that translates to cooling fans system not working properly. Where can I find an accurate schematic or plan of diagnosis to have this fixed the right way?


crwdns2933933:0505.9crwdns2936485:0crwdne2936485:0crwdne2933933:0

crwdns2930801:0crwdne2930801:0

Hi,

You probably have a faulty engine coolant temperature sensor or if the sensor tests OK, a wiring problem between the sensor and the ECM. Hopefully the problem is not in the ECM.

If the sensor is faulty, replace it and restore the fan wiring to the way it was and see how it goes

This sensor is connected to the ECM, which controls the radiator fans.

Here is a link that may be of some help.

http://www.autozone.com/repairguides/GM-...