DTC P1450 Or DTC P1451: Condition

DTC P1450 is set when ECM (PCM) detects that barometric pressure sensor is less than 0.1 volt or more than 5.1 volts. DTC P1451 is set when barometric pressure calculated using Manifold Absolute Pressure (MAP) sensor does not match barometric pressure sensor output voltage during engine deceleration. MIL is illuminated when ECM (PCM) detects malfunction during 2 consecutive drive cycles. Possible causes are:

• Barometric pressure sensor malfunction.
• MAP sensor malfunction.