DTC P1450 & DTC P1451: Condition

DTC P1450 is set when ECM detects that barometric pressure sensor output voltage is more than 5.1 volts for 19 seconds. DTC P1451 is set when barometric pressure calculated using Manifold Absolute Pressure (MAP) sensor does not match barometric pressure sensor output voltage or when ECM detects that barometric pressure sensor output voltage is less than 0.1 volts for 19 seconds. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• Barometric pressure sensor malfunction.
• MAP sensor malfunction.