P1297 No Change In MAP Sensor From Start to Run

SYMPTOM
P-1297 NO CHANGE IN MAP FROM START TO RUN

WHEN MONITORED
Engine is idling with a stable RPM (RPM fluctuation < 64 RPM) and the vehicle is not moving.

SET CONDITION
Too small a difference is seen between barometric pressure at ignition on and manifold vacuum.

POSSIBLE CAUSES
- MAP sensor 5-volt supply circuit open
- MAP sensor wiring harness intermittent defective
- Vacuum ports restricted or defective
- Manifold absolute pressure sensor restricted
- MAP sensor defective (a)
- MAP sensor defective (b)