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P1451





2GR-FXE ENGINE CONTROL: SFI SYSTEM: P1451-P1453: Fuel Tank Pressure Sensor Range/Performance
P1453 - Fuel Tank Pressure Sensor High Input

DTC SUMMARY





DESCRIPTION

The description can be found in the EVAP (evaporative emission) System EVAP System.

MONITOR DESCRIPTION

1. P1451: Pressure sensor abnormal voltage fluctuation or being constant

If the pressure sensor output voltage fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC.

Alternatively, if the sensor output voltage does not change for 10 seconds, the ECM interprets this as the sensor voltage being constant, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.

(Both the malfunctions are detected by 2 trip detection logic).





2. P1452: Pressure sensor voltage low

If the pressure sensor output voltage is below 0.45 V, the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).

3. P1453: Pressure sensor voltage high

If the pressure sensor voltage output is 4.9 V or more, the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P1451 (Noise Monitor)





P1451 (Stuck Monitor)





P1452 and P1453





Key-off monitor sequence 1 to 15

1. Atmospheric pressure measurement





2. First reference pressure measurement





3. Vent valve close stuck check





4. Vacuum introduction for canister





5. Purge VSV stuck closed check





6. Second reference pressure measurement





7. Canister leak check





8. Fuel tank closed valve (TCV) stuck closed check





9. Vacuum introduction for fuel tank





10. TCV stuck closed check





11. Fuel tank pressure sensor stuck check





12 Third reference pressure measurement





13. Fuel tank leak check





14. Fuel tank pressure sensor stuck check





15. Atmospheric pressure measurement





TYPICAL MALFUNCTION THRESHOLDS

1. P1451: Pressure sensor noise





2. P1451: Pressure sensor stuck





3. P1452: Pressure sensor low voltage





4. P1453: Pressure sensor high voltage





CONFIRMATION DRIVING PATTERN

NOTICE:
- The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the Techstream. It takes a maximum of approximately 34 minutes.
- Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
- Do not run the engine during this operation.
- When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.

2. Turn the power switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4. Turn the power switch off and wait for 30 seconds.

5. Turn the power switch on (IG) and turn the Techstream on.

6. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode [A].

7. After the Evaporative System Check is completed, check for DTC by entering the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

8. Read the Pending DTC [B].

HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.

9. Enter the following menus: Powertrain / Engine and ECT / Utility / All readiness.

10. Input the DTC: P1451, P1452 or P1453.

11. Check the DTC judgment result.





HINT
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.

12. If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel tank cap.
- Do not disassemble the canister pump module.
- The Techstream is required to conduct the following diagnostic troubleshooting procedure.

PROCEDURE

1. CONFIRM DTC AND FUEL TANK PRESSURE

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Read the DTCs.

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

(g) Read the EVAP (evaporative emission) pressure displayed on the Techstream.

Result:





B -- CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - BODY GROUND)

C -- GO TO EVAP SYSTEM EVAP System
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - ECM)

(a) Turn the power switch off.

(b) Disconnect the ECM connector.

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

Result:





(d) Reconnect the ECM connector.

B -- REPLACE ECM
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - ECM)

(a) Remove the fuel tank assembly.

(b) Disconnect the fuel tank pressure sensor connector.

(c) Disconnect the ECM connector.

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

Result:





(e) Reconnect the pressure sensor connector.

(f) Reconnect the ECM connector.

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - BODY GROUND)

(a) Remove the fuel tank assembly.





(b) Disconnect the fuel tank pressure sensor connector.

(c) Turn the power switch on (IG).

(d) Measure the voltage and resistance according to the value(s) in the table below.

Text in Illustration





Standard:





Result:





(e) Reconnect the fuel tank pressure sensor connector.

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- Continue to next step.

5. REPLACE FUEL TANK PRESSURE SENSOR

(a) Replace the fuel tank pressure sensor Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

6. REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT
If the exhaust pipe has been removed, go to the next step before reinstalling it.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

7. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the power switch off and wait for 30 seconds.

(f) Turn the power switch on (IG) and turn the Techstream on.

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

(h) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

(i) Input the DTC: P1451, P1452 or P1453.

(j) Check the DTC judgment result.

HINT
If DTC judgment result is NORMAL, the repair has been successfully completed.

NEXT -- END
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