P0181

DTC P0181 FUEL TEMPERATURE SENSOR "A" CIRCUIT RANGE/PERFORMANCE

1. OUTLINE OF DIAGNOSIS
Detect faults in the fuel temperature sensor output properties.
Diagnosis is performed in two methods; drift diagnosis and stuck diagnosis. If either is NG, judge as NG. If both are OK, Judge as OK and clear the NG.

Drift Diagnosis
Normally fuel temperature is lower than engine coolant temperature. When the fuel temperature becomes higher than the engine coolant temperature, the range is considered to be shifted, and judged as NG.




2. COMPONENT DESCRIPTION




3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.

5. DIAGNOSTIC METHOD




Abnormality Judgment
Judge as NG when the continuous time until completing the malfunction criteria given becomes 120 seconds or more.




Normality Judgment
Judge as OK when the criteria given are met.

Stuck Diagnosis
As the engine warms up (cumulative amount of intake air after starting is large), if the fuel temperature which should rise does not, determine as being stuck and NG.




6. ENABLE CONDITION

7. GENERAL DRIVING CYCLE
Always perform diagnosis continuously after 20 seconds or more have passed since the engine started.

8. DIAGNOSTIC METHOD




Abnormality Judgment
Judge as NG when the malfunction criteria given are met.




Normality Judgment
Judge as OK when the criteria given are met.

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

10. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle is completed 3 times in a row
- When "Clear Memory" is performed

11. FAIL SAFE
None

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