P0191

P0191-FUEL PRESS SENSOR AFTERRUN NEGATIVE PLAUSIBILITY





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
At ignition shut off during Afterrun.

- Set Condition:
The Fuel Pressure Sensor signal is below 0.298 volt for 1.0 second.





Diagnostic Test

1. FUEL PRESSURE SENSOR

NOTE: This code can be caused by an intermittent problem in the wiring and connectors to the Fuel Pressure Sensor. Inspect the Fuel Pressure Sensor harness connector and associated wiring for signs of poor terminal contact.

Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds between each engine run cycle.
With the scan tool, read the ECM DTCs.
Did this DTC set again?

Yes

- Replace the Fuel Pressure Sensor.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Intermittent Condition