P1297

Tests 1 - 3:

Tests 4 - 10:

SYMPTOM
P1297 NO CHANGE IN MAP FROM START TO RUN

WHEN MONITORED
With engine speed > 400 < 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 1.72 seconds.

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