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I think the init routine could be more informative on the failure, and I'll look into that... feedback would be highly informative to working out the kinks.
On thing to check is to verify that the device is talking to the car. Use a volt meter and check that the K line pulses (at the OBD plug). If it remains a constant (or no) power, then the device is not communicating. Check your wiring for a bad connection (a bridged or bad solder joint.)
From here, it may be that your device is not listening to the car (a bad connection), or that the car is expecting slightly different timing than what the OBDuino works on. Right now the timing is hardcoded, and will not change. You could recompile with slightly different values and see what happens. (The official 9141 timing has a wide range of acceptable timing values, and OBDuino focuses on just one set within the ranges... )
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