DTC P125D-71: Fuel Flow Control Valve Performance Actuator Stuck [09/2015 - 05/2019]: Procedure

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

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTC P125D-71 is output	A
   DTC P125D-71 and other DTCs are output	B

   HINT: 

   If any DTCs other than P125D-71 are output, troubleshoot those DTCs first.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2015 - 09/2016]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2016 - 09/2017]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2017 - 05/2018]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [05/2018 - 05/2019] 

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Active Test / Activate the Fuel Pressure Discharge / Data List / Fuel Pressure (Low).

   Powertrain > Engine > Active Test 

   Active Test Display
   Activate the Fuel Pressure Discharge

   Data List Display
   Fuel Pressure (Low)

5. Perform the Active Test. Check that the fuel pressure fluctuates.

   Result

   Result	Proceed to
   Fuel pressure fluctuates	A
   Fuel pressure does not fluctuate	B

Result: 

B 

See step  4

Result: 

A 

See step  3

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

   Powertrain > Engine > Clear DTCs 

5. Turn the engine switch off and wait for at least 30 seconds.
6. Start the engine and warm it up.
7. Turn the Techstream on.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

10. Input the DTC: P125D-71.
11. 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
    N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Result

    Proceed to
    NEXT

Result: 

NEXT 

END 

1. Check the pressure discharge valve assembly installation.

   OK

   Pressure discharge valve assembly is installed correctly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Pressure Discharge Valve Assembly

   Result

   Proceed to
   OK
   NG

Result: 

NG 

SECURELY REINSTALL PRESSURE DISCHARGE VALVE ASSEMBLY. Refer to  INSTALLATION [10/2014 - ] 

Result: 

OK 

See step  5

1. Replace the pressure discharge valve assembly.

   Refer to REMOVAL [10/2014 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

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

   Powertrain > Engine > Clear DTCs 

5. Turn the engine switch off and wait for at least 30 seconds.
6. Start the engine and warm it up.
7. Turn the Techstream on.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

10. Input the DTC: P125D-71.
11. Check the DTC judgment result.

    Result

    Result	Proceed to
    ABNORMAL (DTC P125D-71 is output)	A
    NORMAL (DTCs are not output)	B

Result: 

A 

REPLACE ECM. Refer to  REMOVAL [10/2014 - 05/2019] 

Result: 

B 

END