Ayos yun...

Important sa diagnostics, ay kailangan alam mo yung system description...tapos may schematic diagram ka at connector end views...
Important din na alam mo ang OHM's Law... and when diagnosing electronic parts, always check for Voltage drop... di na uso ang test light... Isa pang magandang weapon is yung Fluke Multimeter... Maganda yun lalo na sa intermittent problems, peak min/max, duty cylcle...
Standard naman yung OBD2 sa lahat... kaya kahit anong make.. yung principle ganun pa din...

God Bless!