DTC P0068 MANIFOLD PRESSURE SENSOR RANGE/PERFORMANCE

DTC P0068 MANIFOLD PRESSURE SENSOR RANGE/PERFORMANCE

(1)	Connector	(A)	Output voltage
(2)	Terminal	(B)	Absolute pressure
(3)	O-ring

ENABLE CONDITION

Secondary Parameters	Enable Conditions
Engine coolant temperature	≥ 75°C (167°F)

GENERAL DRIVING CYCLE

Perform the diagnosis continuously after idling.

DIAGNOSTIC METHOD

Abnormality Judgment

Judge NG when either Low side or High side becomes NG. Judge NG when the continuous time of completing the malfunction criteria below becomes more than 3 seconds.

Judgment Value

Malfunction Criteria	Threshold Value
Low side
Engine speed	< 2,500 rpm
Throttle position	≥ 10°
Output voltage	< 1.0 V
High side
Engine speed	600 ←→ 900 rpm
Throttle position	< 1.3°
Output voltage	≥ 2.6 V

Time Needed for Diagnosis: 3 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge OK and clear the NG when both Low side and High side become OK. Judge OK when the malfunction criteria below are completed.

Judgment Value

Malfunction Criteria	Threshold Value
Low side
Engine speed	< 2,500 rpm
Throttle position	≥ 10°
Output voltage	≥ 1.0 V
High side
Engine speed	600 ←→ 900 rpm
Throttle position	< 1.3°
Output voltage	< 2.6 V

DTC CLEAR CONDITION

•	When the OK idling cycle was completed 40 times in a row

•	When “Clear Memory” was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION

•	When the OK driving cycle was completed 3 times in a row

•	When “Clear Memory” was performed

FAIL SAFE

•	Intake manifold pressure sensor process: Estimate the pressure from engine load.

•	ISC feedback: Not allowed to calculate the amount of feedback.

•	Heavy fuel judgment: Not allowed to carry out the heavy judgment.

ECM OPERATING AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)