Diagnostic Method
Calculate the Max. value (DELFLMAX) and cumulative value (SUMFL) of output voltage variation of fuel level sensor during 12.2 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, the diagnosis counter counts up. Judge as NG if the counter indicated 4 time(s).
- Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Integrated times of the condition reaching follows, | ≥ 4 time(s) |
| DELFLMAX | ≥ Value from Map |
| or | |
| SUMFL | ≥ 23.8 V |
| At this time, DELFLMAX: Maximum difference of sensor output for 12288 ms | |
| SUMFL: Integrated value of the sensor output deviation for 12288 ms |
Map
| Fuel level (l , US gal, lmp gal) | 10, 2.64, 2.2 | 20, 5.28, 4.4 | 25,6.61, 5.5 | 30, 7.93, 6.6 | 43, 11.36, 9.46 | 45,11.89, 9.9 | 50,13.21, 11 |
| Measured voltage (V) | 0.248 | 0.519 | 0.796 | 0.6 | 1.025 | 1.069 | 1.402 |
The diagnosis counter does not count up when the following conditions are completed within 12288 ms.
| Maximum value - minimum value of change of tank pressure during 12288 ms | ≥ 0 kPa (0.375031 mmHg, 0 inHg) |
| Maximum value - minimum value of battery voltage during 12288 ms | ≥ 1.2 V |
Time Needed for Diagnosis: 12288 ms x 4 time(s)
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.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| DELFLMAX | < Value from Map |
| SUMFL | < 23.8 V |
| At this time, DELFLMAX: Maximum difference of sensor output for 12288 ms | |
| SUMFL: Integrated value of the sensor output deviation for 12288 ms |
Time Needed for Diagnosis: 12288 ms