P1299

Tests 548 - 553:

SYMPTOM
P-1299 VACUUM LEAK FOUND (IAC FULLY SEATED)

WHEN MONITORED
With the engine running and brake ON.

SET CONDITION
The MAP sensor signal does not correlate to the TP sensor signal.

POSSIBLE CAUSES
- Intake manifold large vacuum leak
- Intake manifold vacuum leak
- MAP sensor not within 1" of ind vacuum gauge
- PCM defective (5-volt supply)
- TPS voltage above 1.5 volts with throttle closed
- TPS voltage below 3.4 volts at wide open throttle