P1297

Tests 1 - 3:

Tests 4 - 8:

SYMPTOM
P1297 - NO CHANGE IN MAP SENSOR FROM START TO RUN

WHEN MONITORED
With engine speed above 400 rpm but less than 1500 rpm and the throttle body at closed throttle.

SET CONDITION
Too small a difference is seen between barometric pressure at ignition ON and manifold vacuum (engine running for 1.76 seconds).

POSSIBLE CAUSES
- MAP sensor wiring harness intermittent defect
- MAP sensor 5 volt supply circuit open
- MAP sensor restricted
- MAP sensor defective (change present)
- MAP sensor defective (no change present)
- Vacuum ports restricted or defective