P0464

DTC P0464 - FUEL LEVEL SENSOR CIRCUIT INTERMITTENT

OUTLINE OF DIAGNOSIS
Detect the malfunction of unstable output from fuel level sensor caused by noise.
Judge NG when the max. value and cumulative value of output voltage variation of fuel level sensor is larger than the threshold value.




ENABLE CONDITION

GENERAL DRIVING CYCLE
- Perform the diagnosis continuously in idling condition.
- Pay attention to the fuel level.

DIAGNOSTIC METHOD




Calculate the Max. value (delflmax) and cumulative value (sumfl) of output voltage variation of fuel level sensor during 10.2 seconds. Judge it normal when both max. and cumulative values are not over the threshold value. Otherwise, when either of them is over the threshold value, count the diagnosis counter up. And judge NG if the counter indicated 4 counts.




- Abnormality Judgment
Judge NG when the malfunction criteria are completed.




Do not count the diagnosis counter up when the following conditions are completed during 10.2 seconds.




- Normality Judgment
Judge OK and clear the NG when the malfunction criteria are 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
None

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