P0068

Test 1 - Test 4:

Test 5 - Test 8:

Test 9 - Test 12:

Test 13 - Test 16:

Test 17:

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

WHEN MONITORED
During all drive modes.

SET CONDITION
If vacuum drops below 1.59Hg with engine RPM greater than 2000 RPM and closed throttle.

POSSIBLE CAUSES
- Good trip equal to zero
- Vacuum leak
- Resistance in (F856) 5-volt supply circuit
- (F856) 5-volt supply circuit shorted to ground
- MAP sensor
- Resistance in the (K1) MAP signal circuit
- (K1) MAP signal circuit shorted to ground
- Resistance in the (K900) sensor ground circuit
- TP sensor operation
- Resistance in the (F855) 5-volt supply circuit
- (F855) 5-volt supply circuit shorted to ground
- TP sensor
- Resistance in the (K22) TP sensor No.1 signal circuit
- (K22) TP sensor No.1 signal circuit shorted to ground
- Resistance in the (K900) sensor ground circuit
- PCM