So last week i bought a 2007 versa with manual transmission, worked fine, untill this morning, last night i did an engine shampoo and used compressor with air to remove the water, with engine running on idle. This morning it won't start and i have a P0605 code, rom error or something. i don't know where to start, i googled it, and it says there is a PCM, where is it located and what does it look like? maybe there is water in it. What else should i do?