DTC P1451: Fuel Tank Pressure Sensor Range/Performance; DTC P1452: Fuel Tank Pressure Sensor Low Input; DTC P1453: Fuel Tank Pressure Sensor High Input [10/2017 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) (do not start the engine).
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 

6. Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Tank.

   Powertrain > Engine and ECT > Data List 

   Tester Display
   Vapor Pressure Tank

7. Read the fuel tank pressure displayed on the Techstream.

   Result

   Display (DTC Output)	Test Result	Suspected Trouble Area	Proceed to
   P1451	-	Fuel tank pressure sensor	C
   P1452	Less than -17.1875 kPa(gauge) [-2.493 psi(gauge)]	Wire harness/connector (fuel tank pressure sensor - ECM) Fuel tank pressure sensor Short in ECM circuit	A
   P1453	Higher than 23.9375 kPa(gauge) [3.4721 psi(gauge)]	Wire harness/connector (fuel tank pressure sensor - ECM) Fuel tank pressure sensor Open in ECM circuit	B

Result:  2

B 

See step  4

Result:  3

C 

See step  5

Result:  1

A 

See step  2

1. Disconnect the ECM connector.
2. Measure the resistance according to the value(s) in the table below.

   Result

   Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
   A43-49 (PTNK) - Body ground	Always	Below 10 Ω	Wire harness/connector (fuel tank pressure sensor - ECM) Short in fuel tank pressure sensor circuit	A
   		10 kΩ or higher	Wire harness/connector (fuel tank pressure sensor - ECM) Short in ECM circuit	B

Result:  2

B 

See step  7

Result:  1

A 

See step  3

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

   Result

   Tester Connection	Condition	Specified Condition	Suspected Trouble Area	Proceed to
   A43-49 (PTNK) - Body ground	Always	10 kΩ or higher	Short in fuel tank pressure sensor circuit	A
   		Below 10 Ω	Wire harness/connector (fuel tank pressure sensor - ECM)	B

Result:  2

B 

See step  6

Result:  1

A 

See step  4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the fuel tank pressure sensor connector.
2. Turn the power switch on (IG).
3. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   c1-3 (VC) - Body ground	Power switch on (IG)	4.75 to 5.25 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   c1-1 (E2) - Body ground	Always	Below 10 Ω

   Result

   Result	Suspected Trouble Area	Proceed to
   Voltage and resistance within standard ranges	Open in fuel tank pressure sensor circuit	A
   Voltage and resistance outside standard ranges	Open in wire harness/connector (fuel tank pressure sensor - ECM)	B

Result:  2

B 

See step  6

Result:  1

A 

See step  5

1. Replace the fuel tank pressure sensor.

   Refer to REMOVAL [11/2016 - ]

NEXT 

See step  8

NEXT 

See step  8

1. Replace the ECM.

   Refer to REMOVAL [11/2016 - ]

NEXT 

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 power switch on (IG).
7. Turn the Techstream on.
8. Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

   Powertrain > Engine and ECT > Utility 

   Tester Display
   All Readiness

10. Input the DTC: P1451, P1452 or P1453.
11. Check the DTC judgment result.

    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

NEXT 

END