P0191-FUEL PRESS SENSOR AFTERRUN POSITIVE PLAUSIBILITY
For a complete wiring diagram Refer to Section 8W
- When Monitored:
At ignition shut off during Afterrun.
- Set Condition:
The Fuel Pressure Sensor signal is above 0.698 volt for 1.0 second.
| Possible Causes |
| FUEL PRESSURE SENSOR |
| INTERMITTENT CONDITION |
Diagnostic Test
1. FUEL PRESSURE SENSORNOTE: 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 in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)