P1297

Tests 540 - 545:

Tests 546 - 547:

SYMPTOM
P-1297 NO CHANGE IN MAP 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)