DTC Troubleshooting: P0191
DTC P0191: Fuel Rail Pressure Sensor Circuit Range/Performance Problem
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0191 Fuel Rail Pressure Sensor Circuit Range/Performance Problem
    

1.
Problem verification:

Problem verification
?1.
Record all the on-board snapshots with the HDS.

?2.
Turn the vehicle to the ON mode.

?3.
Clear the DTC with the HDS.


?4.
Start the engine.

?5.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?6.
Test-drive the vehicle for several minutes in the range of these recorded on-board snapshot parameters:
Engine Speed
Vehicle Speed
ECT Sensor 1
MAP Sensor (Hi Res)
REL TP Sensor
Signal
Current conditions
Values
Unit
Engine Speed
    
Vehicle Speed
    
ECT Sensor 1
    
MAP Sensor (Hi Res)
    
REL TP Sensor
    

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0191 Fuel Rail Pressure Sensor Circuit Range/Performance Problem
    

Is DTC P0191 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the fuel rail pressure sensor and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Connector visual check:

Connector visual check
?1.
Check for poor connections or loose terminals at the fuel rail pressure sensor.

Are the connections and terminals OK?

     
YES
     
     
     
     
NO
     
     
     
Repair the connections or terminals.?