You can get fault codes, actual values, and test duct positions through the display.

I wrote an article explaining the capabilities for a 210 chassis. The 202 chassis is similar. The article has charts that apply to the 210. The article is here: http://www.babcox.com/editorial/ic/ic60046.htm

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician