P1297

Tests 511 - 515:

Tests 516 - 519:

Tests 520 - 524:

Tests 525 - 530:

Test 531:

SYMPTOM
P1297 - NO CHANGE IN MAP FROM START TO RUN

WHEN MONITORED
With engine speed above 400 rpm but less than 1500 rpm and the throttle blade 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 wiring harness observable defect
- Vacuum ports restricted or defective
- MAP sensor 5 volt supply circuit open
- MAP sensor 5 volt supply circuit shorted to ground
- MAP sensor signal circuit shorted to sensor ground circuit
- MAP sensor signal circuit shorted to ground
- MAP sensor defective
- MAP sensor defective (no press change)
- MAP sensor defective (press change)
- MAP sensor restricted
- PCM defective (5 volt supply)
- PCM defective (signal circuit)