DTC P1451: CDCV Circuit Malfunction: Condition
WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Powertrain Control Module (PCM) detects input voltage from Canister Drain Cut Valve (CDCV) varies more than .5 volt. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- Canister Drain Cut Valve (CDCV) malfunction.
- Short or open circuit between CDCV and PCM.
- Open circuit between main relay and CDCV.
- PCM malfunction.