Hi AgusH
The differences between ISO 9001 and TS 16949 series are in the added requirements for automotive sector.
For maintenance, it states that you have to identifie the key equipements for your production process (It means you sould have a method to priotirize your equipements), put a preventive maintenance system that responds to the criterias mentionned in my precedent post, also you have to put in place predictive maintenance (a maintenance based on process measurement) for example, we had a measurement on a product that was related to a tool wear, we established an Xbar-R chart and one of the responses to the drift in the measurement was a tool maintenance.
Also from a systematic point of view, you have to add the notion of efficiency in your objectives
Best regards
Amine