P0451

DTC P0451 - EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR RANGE/PERFORMANCE

OUTLINE OF DIAGNOSIS
Detect the tank pressure sensor output property abnormality.
Judge NG when there is no pressure variation, which should exist in the tank, considering the engine status.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
- Perform the diagnosis continuously in 60 seconds or more after starting the engine.
- Be sure to check the fuel level and fuel temperature.

DIAGNOSTIC METHOD




- Abnormality Judgment
Judge NG when the malfunction criteria is completed.
If the fuel level (Max. -Min.) in every 60 seconds is less than 5 l (1.3 US gal, 1.1 Imp gal), extend 60 seconds more and make judgment with the Max. and Min. fuel level in 120 seconds.
If the difference did not appear though the time extended, extend the time (180, 240, 300 seconds) and continue the judgment.
Diagnosis counter will count up when the difference of fuel level (Max. . Min.) is more than 5 l (1.3 US gal, 1.1 Imp gal).

Time Needed for Diagnosis: 60 seconds * 16 times or more
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous drive cycles.




- Normality Judgment
Judge OK when the malfunction criteria is completed.

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
Purge control solenoid valve control: Purge fixation mode is prohibited.

ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)