Noisy fans, AHT error 4SNS/1/40000001:tgod-1.000

Hello, i run an AHT cause my old imac 24' fans came suddenly noisy. (snow leopard)
(I previously tried reset PRAM..., shut down/wait/unplug..., check apps proc%) ...
AHT returns this error : 4SNS/1/40000001:tgod-1.000 What does that mean? What should i do ?
Thanks for your help !

Means you have a defective sensor. I think it may be for the optical drive. That's what makes the fans run at top speed. Please make a Genius Appointment and take it in for service.

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