DTC - General Description
DTC P0451 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR1. OUTLINE OF DIAGNOSIS
Detect the tank pressure sensor output property abnormality.
Judge as NG when there is no pressure variation, which should exist in the tank, considering the engine status.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
- Perform the diagnosis continuously after 60 sec have passed since the engine started.
- Pay attention to the fuel level and temperature.
5. DIAGNOSTIC METHOD
- Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
If the difference between the Max. fuel level every 60 sec and Min. fuel level every 60 sec is less than 2 L (0.528 US gal, 0.44 Imp gal), extend 60 sec and make judgment with the Max. and Min. values for the fuel level in 60 sec x 2. If a difference does not appear, extend the time (60 sec x 3, 60 sec x 4, 60 sec x 5) and continue the judgment. If the difference between the Max. fuel level every 60 sec and Min. fuel level every 60 sec is 2 L (0.528 US gal, 0.44 Imp gal) or more, the diagnosis counter counts up.
Time Needed for Diagnosis: 60 sec x 16 time or more
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
6. DTC CLEAR CONDITION
- When the OK idling cycle is completed 40 times in a row
- When "Clear Memory" is performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONS
- When the OK driving cycle is completed 3 times in a row
- When "Clear Memory" is performed
8. FAIL SAFE
Purge control solenoid valve control: Purge fixed mode is prohibited.
9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)