P0464

DTC P0464 - FUEL LEVEL SENSOR CIRCUIT INTERMITTENT

OUTLINE OF DIAGNOSIS
Detect the malfunction of unstable output from fuel level sensor because of noise.
Judge NG by comparing the max value and cumulative value of the amount of output voltage variation from fuel level sensor with threshold value.




ENABLE CONDITION

GENERAL DRIVING CYCLE
Perform the diagnosis continuously at idling.

DIAGNOSTIC METHOD




Calculate the max. value of the amount of output voltage variation from fuel level sensor and cumulative value during 12.8 seconds. Comparing the max value and cumulative value with the threshold value, and judge OK when the both do not go over the threshold value. Otherwise, when one of them goes over the threshold, count the counter up. Judge the ECM is troubled when the counter increased 4 times in a row.




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




- Normality Judgment
Judge OK and clear the NG when all the malfunction criteria are completed.

DTC CLEAR CONDITION
- When the OK idling cycle is completed 40 times in a row
- When "Clear Memory" was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle is 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)