The PCM sets DTC P0191 when the average value from fuel rail pressure sensor is out of range of threshold value.
Item | Detecting Condition | Possible Cause | |
Case 1 | DTC Strategy |
•
High pressure sensor output jitter | 1. Poor connection 2. FRPS 3. Abnormal fuel pressure 4. Low or no fuel |
Enable Conditions |
•
Sensor Output Voltage greater than 4.85V and less than 0.20V | ||
Threshold Value |
•
Sensor output voltage jump time less than 0.06 sec. | ||
Diagnostic Time |
•
1 sec. | ||
Case 2 | DTC Strategy |
•
Rationality check negative offset | |
Enable Conditions |
•
Multiplicative Long Term FT less than 0.8 %
•
Adaptive Long Term FT less than -6.0 %
•
IG ON : Before Engine Start | ||
Threshold Value |
•
Rail Pressure less than 0.13 Mpa(1.3 bar/18.85 psi) | ||
Diagnostic Time |
•
6 sec. | ||
Case 3 | DTC Strategy |
•
Rationality check positive offset | |
Enable Conditions |
•
Multiplicative Long Term FT greater than 1.2 %
•
Adaptive Long Term FT greater than 6.0 %
•
Soaking Time greater than 4 hr
•
IG ON : Before Engine Start | ||
Threshold Value |
•
Rail Pressure greater than 1.3 Mpa(13 bar/188.54 psi) | ||
Diagnostic Time |
•
Immediate | ||
MIL ON Condition |
•
2 driving cycles | ||
