Locating and cleaning Throttle body K12

Hi guys. I am about to clean my drive by wire throttle body of a Micra K12. Can anybody help me with the following 2 questions
1. Locatingthe valve on a 1.2 petrol engine from 2005 (looks like its somewhere under the black engine cover?
2. Re-learning the ECM. Should I disconnect the battery beforethe job or keep the ECM powered. Looks like the Re-learning procedure can be a big challenge after the job : /

Thanks for reading : )
 
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