DTC P0068 MANIFOLD PRESSURE SENSOR RANGE/PERFORMANCE
|
DTC P0068 MANIFOLD PRESSURE SENSOR RANGE/PERFORMANCE
|
Detect the malfunction of intake manifold
pressure sensor output property. Judge NG when the intake air pressure
AD value is Low whereas it seemed to be High from the viewpoint
of engine condition, or when it is High whereas it seemed to be
Low from the engine condition.
(1)
|
Connector
|
(A)
|
Output
voltage
|
|
|
(2)
|
Terminal
|
(B)
|
Absolute
pressure
|
|
|
(3)
|
O-ring
|
|
|
|
|
Secondary
Parameters
|
Enable
Conditions
|
Engine
coolant temperature
|
≥ 70°C
(158°F)
|
Perform the diagnosis continuously after
idling.
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 the predetermined time.
Judgment
Value
Malfunction
Criteria
|
Threshold
Value
|
Low
side
|
|
Engine
speed
|
< 2500
rpm
|
Throttle
position
|
≥ 13°
|
Intake
air amount per engine 0.5 rev.
|
≥ 0.55
g (0.019 oz)/rev
|
Output
voltage
|
< 1.4
V
|
High
side
|
|
Engine
speed
|
600 ←→ 900
rpm
|
Throttle
position
|
≤ 2.44°
|
Intake
air amount per engine 0.5 rev.
|
< 0.5
g (0.018 oz)/rev
|
Output
voltage
|
≥ 3.4
V
|
Time Needed for Diagnosis:
Low
side 3 seconds, high side 7 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
|
< 2500
rpm
|
Throttle
position
|
≥ 13°
|
Intake
air amount per engine 0.5 rev.
|
≥ 0.55
g (0.019 oz)/rev
|
Output
voltage
|
≥ 1.4
V
|
High
side
|
|
Engine
speed
|
600 ←→ 900
rpm
|
Throttle
position
|
≤ 2.44°
|
Intake
air amount per engine 0.5 rev.
|
< 0.5
g (0.018 oz)/rev
|
Output
voltage
|
< 3.4
V
|
•
|
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
|
•
|
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.
|
•
|
Fuel cut control: Perform fuel cut
when intake manifold pressure sensor is NG. (When fuel injection
is large.)
|
ECM OPERATING
AT DTC SETTING
|
Memorize the freeze frame data. (For test
mode $02)