DTC P0191: Fuel Rail Pressure Sensor Circuit Range / Performance [10/2015 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.

   Powertrain > Engine and ECT > Trouble Codes 

   Result

   Result	Proceed to
   DTC P0191 is output	A
   DTC P0191 and P0087, P0088, P0171, P0172, P0174 and/or P0175 are output
   DTC P0191 and other DTCs are output	B

   HINT: 

   If DTC P0191 and P0087, P0088, P0171, P0172, P0174 and/or P0175 are output simultaneously, troubleshoot for DTC P0191 first.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2015 - 08/2016]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2016 - 12/2017]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2017 - 03/2018]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2018 - 08/2018]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2018 - 08/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2019 - 07/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2020 - ] 

Result: 

A 

See step  2

1. Check around and beneath the vehicle for fuel leaks, fumes, etc.

   OK

   No fuel leaks present.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  10

Result: 

OK 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

5. Start the engine and warm it up.
6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Target Fuel Pressure / Data List / High Fuel Pressure Sensor.

   Powertrain > Engine and ECT > Active Test 

   Active Test Display
   Control the Target Fuel Pressure

   Data List Display
   High Fuel Pressure Sensor

7. Check the value of the Data List item "High Fuel Pressure Sensor" when the target fuel pressure is increased and decreased using the Active Test.

   Result

   Result	Proceed to
   "High Fuel Pressure Sensor" value follows the change in target fuel pressure	A
   "High Fuel Pressure Sensor" value does not follow the change in target fuel pressure	B

Result: 

B 

See step  9

Result: 

A 

See step  4

1. Disconnect the fuel pressure sensor connector.
2. Disconnect the ECM assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D61-3 (PR) - D1-86 (PR)	Always	Below 1 Ω
   D61-2 (E2) - D1-85 (EPR)	Always	Below 1 Ω
   D61-3 (PR) or D1-86 (PR) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  8

Result: 

OK 

See step  5

1. Replace the fuel delivery pipe with sensor assembly LH (fuel pressure sensor (for high pressure side)).

   Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] , or refer to REMOVAL [08/2019 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

   Refer to INITIALIZATION [10/2015 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs.

   Powertrain > Engine and ECT > Clear DTCs 

5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the Techstream on.
7. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9. Read the pending DTCs.

   Powertrain > Engine and ECT > Trouble Codes 

   Result

   Result	Proceed to
   DTC P0191 is output	A
   DTCs are not output	B

Result: 

B 

END 

Result: 

A 

See step  7

1. Replace the ECM assembly.

   Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 03/2018] , or refer to REMOVAL [03/2018 - 08/2019] , or refer to REMOVAL [08/2019 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  11

1. Repair or replace the wire harness or connector.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  11

1. Replace the fuel delivery pipe with sensor assembly LH (fuel pressure sensor (for high pressure side)).

   Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019] , or refer to REMOVAL [08/2019 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

   Refer to INITIALIZATION [10/2015 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  11

1. Repair or replace the fuel leak point.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  11

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs.

   Powertrain > Engine and ECT > Clear DTCs 

5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the Techstream on.
7. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9. Read the pending DTCs.

   Powertrain > Engine and ECT > Trouble Codes 

   OK

   DTCs are not output

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END