Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Fuel Rail Pressure Sensor "A" Signal Stuck in Range (P01902A,P019064)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Fuel Rail Pressure Sensor "A" Signal Stuck in Range (P01902A,P019064)

DESCRIPTION

Refer to DTC P019011.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P01902A

Fuel Rail Pressure Sensor "A" Signal Stuck in Range

When target high pressure side fuel pressure changes, the change in fuel pressure sensor value is abnormal (2 trip detection logic).
  • Fuel pressure
  • Fuel pressure sensor (for high pressure side)
  • Open or short in fuel pressure sensor (for high pressure side) circuit
  • ECM

Comes on

DTC stored

SAE Code:

P0191

P019064

Fuel Rail Pressure Sensor "A" Signal Plausibility Failure

Although engine has been stopped and left as is for a long time, high pressure side fuel pressure is higher or lower than threshold (2 trip detection logic).
  • Fuel pressure
  • Fuel pressure sensor (for high pressure side)
  • Open or short in fuel pressure sensor (for high pressure side) circuit
  • ECM

Comes on

DTC stored

SAE Code:

P0191

MONITOR DESCRIPTION

Fuel Pressure Sensor Stuck Monitor

If the fuel pressure sensor (for high pressure side) value does not follow the change in the target high pressure side fuel pressure, it is judged as a malfunction. If this malfunction is detected in 2 consecutive driving cycles, the ECM will illuminate the MIL and store DTC P01902A.

Fuel Pressure Sensor Correlation Monitor with Barometric Pressure

If the fuel pressure sensor (for high pressure side) value is less than or higher than the threshold value when a cold start is performed after the engine has been warmed up and then stopped, it is judged as a malfunction has occurred. If this malfunction is detected for 2 consecutive driving cycles, the ECM will illuminate the MIL and store DTC P019064.

MONITOR STRATEGY

Related DTCs

P0191: Fuel pressure sensor rationality (correlation monitor with barometric pressure)

P0191: Fuel pressure sensor rationality (stuck monitor)

Required Sensors/Components (Main)

Fuel pressure sensor (for high pressure side)

Required Sensors/Components (Related)

Atmospheric pressure sensor (ECM)

Frequency of Operation

Continuous

Duration

Less than 10 seconds: Correlation monitor with barometric pressure

Less than 30 seconds: Stuck monitor

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Correlation Monitor with Barometric Pressure

All of the following conditions are met

-

Engine coolant temperature sensor malfunction (P0117, P0118)

Not detected

High pressure fuel pump malfunction (P1235)

Not detected

Fuel pressure sensor (for high pressure side) circuit malfunction (P0192, P0193)

Not detected

Soak timer malfunction (P2610)

Not detected

Battery voltage

8 V or higher

Engine switch

Off

Soak time

5, 7 or 9.5 hours

Atmospheric pressure

76 kPa(abs) [11 psi(abs)] or higher
Stuck Monitor

All of the following conditions are met

-

Engine coolant temperature sensor malfunction (P0117, P0118)

Not detected

High pressure fuel pump malfunction (P1235)

Not detected

Fuel pressure sensor (for high pressure side) circuit malfunction (P0192, P0193)

Not detected

Battery voltage

11 V or higher

Fuel cut

Off

Injection mode

NOT PFI (Port fuel injection)

TYPICAL MALFUNCTION THRESHOLDS

Correlation Monitor with Barometric Pressure

Malfunction counter

5 seconds or more

Fuel pressure sensor (for high pressure side) output

Less than -1.394 MPa (-14.2 kgf/cm2, -202.1 psi), or higher than 2.035 MPa (20.8 kgf/cm2, 295.1 psi)
Stuck Monitor

Malfunction counter

5 times or more

Fuel pressure sensor (for high pressure side) output deviation

Less than 0.3 MPa (3.1 kgf/cm2, 43.5 psi)

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
  9. Drive the vehicle for 15 minutes or more [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  10. Turn the engine switch off.
  11. With the engine stopped, leave the vehicle as is for 5 hours or more [D].
  12. Turn the engine switch on (IG) [E].
  13. Enter the following menus: Powertrain / Engine / Trouble Codes [F].
  14. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  16. Input the DTC: P01902A or P019064.
  17. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [B] through [F] again.
    • [B] to [F]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

Refer to DTC P019011.

Click here

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P01902A OR P019064)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P01902A or P019064 is output

A

DTC P01902A or P019064, and P008700, P008800, P017100, P017200, P017400 and/or P017500 are output

DTC P01902A or P019064 and other DTCs are output

B

HINT:

  • If DTC P01902A or P019064, and P008700, P008800, P017100, P017200, P017400 and/or P017500 are output simultaneously, troubleshoot for DTC P01902A or P019064 first.
  • If any DTCs other than P01902A or P019064 are output, troubleshoot those DTCs first.
B

GO TO DTC CHART

A

2.

CHECK FUEL LEAK

(a) Check around and beneath the vehicle for fuel leaks, fumes, etc.

OK:

No fuel leaks present.

NG

GO TO STEP 11

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE TARGET FUEL PRESSURE OFFSET)

(a) Connect the Techstream to the DLC3.

(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Target Fuel Pressure Offset / Data List / Coolant Temperature and High Fuel Pressure Sensor.

Powertrain > Engine > Active Test

Active Test Display

Control the Target Fuel Pressure Offset

Data List Display

Coolant Temperature

High Fuel Pressure Sensor

(e) 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

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
B

GO TO STEP 10

A

4.

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) - ECM)

(a) Disconnect the fuel pressure sensor (for high pressure side) connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D61-3 (PR) - D2-87 (PR)

Always

Below 1 Ω

D61-2 (E2) - D2-133 (ETHW)

Always

Below 1 Ω

D61-3 (PR) or D2-87 (PR) - Body ground and other terminals

Always

10 kΩ or higher
NG

GO TO STEP 8

OK

5.

REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY LH (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE))

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

Click here

HINT:

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

Click here

NEXT

6.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTC.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

NEXT

7.

CHECK WHETHER DTC OUTPUT RECURS (DTC P01902A OR P019064)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

(c) Read the pending DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P01902A or P019064 is output

B
A

END
B

GO TO STEP 9

8.

REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Repair or replace the wire harness or connector.

NEXT

GO TO STEP 12

9.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

GO TO STEP 12

10.

REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY LH (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE))

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

Click here

HINT:

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

Click here

NEXT

GO TO STEP 12

11.

REPAIR OR REPLACE FUEL LEAK POINT

(a) Repair or replace the fuel leak point.

NEXT

12.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTC.

Powertrain > Engine > Clear DTCs

(e) Turn the engine switch off and wait for at least 30 seconds.

NEXT

13.

CHECK WHETHER DTC OUTPUT RECURS (DTC P01902A OR P019064)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

(c) Read the pending DTCs.

Powertrain > Engine > Trouble Codes

OK:

DTCs are not output

NEXT

END
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