DTC P0446: CANISTER DRAIN CUT VALVE (CDCV) MALFUNCTION Mazda MX-5 NB

PCM detects no fuel tank pressure difference when CDCV valve is released. Possible causes are

1. Stuck CDCV.
2. Tank pressure control valve malfunction.
3. Charcoal canister malfunction.
4. Air filter, hoses or check valve clogged.
5. EGR boost sensor malfunction.
6. Fuel level sensor malfunction.
7. Fuel pressure sensor malfunction.
8. ECT sensor malfunction.
9. IAT sensor malfunction.
10. TP sensor malfunction.
11. MAF sensor malfunction.
12. VSS malfunction.
13. Open or short in wiring.