P1297

Tests 1 - 3:

Tests 4 - 8:

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

WHEN MONITORED
With engine rpm above 400 but less than 1500 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
- Vacuum ports restricted or defective
- MAP sensor restricted
- MAP sensor defective (change present)
- MAP sensor defective (no change present)