I had a problem with my Daihatsu 4X4. The Check Light was on the dash, so I had a look around the web for on how to read the codes.
Came across this site www.auto-diagnostic-codes.com
Has FREE code info on Engines, ABS, Auto Trans, Airbags.... for cars from US, European, Australian and Japanese and Korean vehicles.
I was able to follow the instructions to read my engine codes, and then type the code in the system.
Code came up as Code 31: Manifold Absolute Pressure (MAP) sensor or circuit.
I tested and replaced the sensor, and that fixed problem. Just thought this website might also help others.