P0191 is set when the Fuel Pressure Signal is too high or low.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Plausibility Monitoring | 1. Poor Connector Connection 2. Defected Fuel Rail Pressure Sensor Circuit 3. Defected Fuel Rail Pressure Sensor | |
Enable Condition | Case 1,2 |
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No additional warm up fueling
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Full load not active
•
Catalyst purge not active
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Lamda control active
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Catalyst overheating prevention not active
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Leak detection not active
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Catalyst heating finished
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Engine speed higher than 512 RPM and lower than 4000 RPM
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Mass fuel flow higher than 0.01 g/rev and lower than 0.14 g/rev
•
15 sec. after engine start
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Volume fuel flow less than 7.6 to 102 L/h versus engine speed
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Canister load lower than 0.5 | |
Threshold Value | Case 1 |
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Pending fuel system error(P2187 or P2191 or P0171)
•
Lambda controller including adaptive values more than 25% and minimum injection time not actvie and fuel pressure controller lower than -50.7 psi(-3.5bar) | |
Case 2 |
•
Pending fuel system error(P2188 or P2192 or P0172)
•
Lambda controller including adaptive values less than -20% and minimum injection time not actvie and fuel pressure controller more than 58.0 psi(4bar) | ||
Diagnostic Time |
•
8 sec. | ||
MIL ON Condition |
•
2 Driving Cycle | ||
