P0068

Tests 1 - 4:

Tests 5 - 8:

Tests 9 - 12:

Tests 13 - 16:

Tests 17 - 19:

SYMPTOM
P0068-MANIFOLD PRESSURE/THROTTLE POSITION CORRELATION - HIGH FLOW/VACUUM LEAK DETECTED

WHEN MONITORED
Engine Running, during all drive modes.

SET CONDITION
If vacuum drops below 1.5 Hg with engine RPM greater than 2000 RPM at closed throttle.

POSSIBLE CAUSES
- Intermittent condition
- Vacuum leak
- High resistance in MAP 5 volt supply circuit
- Resistance to ground in MAP 5 volt supply circuit
- MAP sensor
- High resistance in MAP sensor signal circuit
- Resistance to ground in MAP sensor signal circuit
- High resistance in MAP sensor ground circuit
- PCM
- High resistance in TPS 5 volt supply circuit
- Resistance to ground in TPS 5 volt supply circuit
- TP sensor
- High resistance in TP sensor signal circuit
- Resistance to ground in TPS signal circuit
- High resistance in TPS ground circuit
- PCM