P0451

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

OUTLINE OF DIAGNOSIS




Detect the malfunction of tank pressure sensor output property.
Judge NG when there is little variation in the fuel tank pressure even if the vehicle is in driving status where there must be variation in the fuel tank pressure considering the fuel temperature and fuel level.
- If NG condition (a) & (b) are experienced, NG results.
(If there is OK, NG experience becomes unexperienced.)
- If OK conditions (a) & (b) are experienced, OK results.
(If there is NG, OK experience becomes unexperienced.)




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 30 seconds after starting the engine.

DIAGNOSTIC METHOD
1. There is no tank pressure variation when there is fuel temperature variation of 7 °C (45 °F).
2. There is no tank pressure variation even when there is fuel level variation of 2 L (0.5 US gal, 0.4 Imp gal) or more every 60 seconds.
Judge NG when both of the conditions above are experienced.




- Abnormality Judgment
Judge NG when both of the conditions below are experienced.




- Normality Judgment
Judge OK when both of the conditions below are experienced, and clear NG.

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
Fix the fuel tank pressure at 0 kPa (0 mmHg, 0 inHg).

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