What this code means
P1454 means the fuel tank pressure sensor output is outside its specified range.
P1454 concerns the fuel tank pressure sensor output being outside its specified range. The diagnosis uses the FTP reading to select the applicable inspections, then examines the vent hoses, vent shut valve, sensor and EVAP canister under their individual test conditions.
The same pressure range appears at several stages, but the physical setup changes. The first reading is taken with the emergency fuel funnel inserted. Later readings are taken after the particular hose disconnection or sensor removal stated in that step. The value and the setup together identify what is being evaluated.
What the vehicle may do
- The FTP sensor output may be outside its specified range.
Possible fault areas
- Possible fault areas include the FTP sensor and its vent hose.
- The EVAP canister, vent hose, drain tube joint, or vent shut valve may also be involved.
The HDS connection and recorded data come first. The listed function paths identify the data view and the vent-valve command used in the procedure. The initial FTP reading then determines which inspection group applies.
When the initial reading is within the stated range, the group includes the canister vent hose and vent shut valve as well as the common FTP sensor/canister checks. Outside that range, the group covers the common FTP sensor/canister checks. Preserve that distinction when moving through the component inspections.
Diagnostic path
Understand the stored condition
P1454 means Fuel Tank Pressure (FTP) Sensor Circuit Range/Performance Problem. The PCM controls this system. It stores this code when the FTP sensor output is outside its specified range. The checks cover the sensor and related EVAP components.
Connect and read the HDS
To check this system's information, select PGM-FI on the HDS. If the system indicators stay on, turn the vehicle to OFF (LOCK) mode. Then connect the HDS to the data link connector, or DLC. Turn the vehicle to ON mode. Check that the HDS communicates with the vehicle. If it does not, the DLC circuit needs troubleshooting. Check the DTC and note it. Also check the freeze data and on-board snapshot data for applicable systems.
The HDS can read DTCs, freeze data, current data, and each system's data. Freeze data shows the system conditions when the first malfunction that activated the indicator was detected. Use the indicated DTC to choose the appropriate troubleshooting procedure.
Understand the inspection outline
Depending on the failure conditions and the vehicle, you may be able to rule out some inspection items.
HDS functions used for these checks
To find CVS ON on the HDS, select PGM-FI, Function Test, EVAP TEST, SINGLE SOLENOID, then CVS ON. For data readings, select PGM-FI, then Data List.
Check the initial FTP reading
Insert the emergency fuel funnel into the fuel filler neck. You will find it in the trunk tool box. With the funnel inserted, check the HDS [FTP Sensor] reading. It should be -0.67 to 0.67 kilopascals. If the reading is within that range, the checks include the EVAP canister vent hose and vent shut valve, along with the FTP sensor vent hose, sensor port, and EVAP canister.
If the reading is outside that range, the checks cover the FTP sensor vent hose, sensor port, and EVAP canister.
This is the branching reading, so its setup is important: the emergency fuel funnel is inserted before the FTP value is checked. Read the within-range or outside-range outcome in that condition. The result chooses the inspection group; the later pressure readings serve the individual component checks under their changed setups.
Run the confirmation conditions
Start the engine. Let it idle without load, in P or N, until the radiator fan comes on. Then monitor the HDS [EVAP PC Duty], which is purge control duty. Hold the engine speed at 3,000 rpm with HDS [EVAP PC Duty] at 20 % or more. Maintain those conditions for at least 4 minutes. Then let the engine idle. Monitor the HDS [OBD STATUS (PGM-FI)] for DTC P1454 and/or P2422.
The confirmation combines engine speed, purge-control duty and a minimum operating period. Those requirements belong together before the engine returns to idle and the specified OBD status is monitored. This operating confirmation has a different role from choosing the inspection group with the initial FTP pressure reading.
Check the EVAP canister vent hose
Disconnect the vent hose from the EVAP canister. Turn the vehicle to ON mode. Check the HDS [FTP Sensor] reading. A normal reading is -0.67 to 0.67 kilopascals. If this check is abnormal, there is a problem with the EVAP canister vent hose or drain tube joint.
Check the vent shut valve
The EVAP canister vent shut valve must already be removed for this functional check. Connect the connector (2P) to the valve. Turn the vehicle to ON mode. Then select the HDS [CVS ON]. Check the valve's operation. It should be free of corrosion and operate properly. If this check is abnormal, there is a problem with the EVAP canister vent shut valve.
The valve is removed for this functional check, but its specified connector is attached. The HDS command is used to check operation, and the result also includes the corrosion condition. Both of those observations contribute to the normal result; checking only one would not describe the full criterion given here.
Check the FTP sensor vent hose
Disconnect the FTP sensor vent hose from the FTP sensor. Check the HDS [FTP Sensor] reading. A normal reading is -0.67 to 0.67 kilopascals. If this check is abnormal, there is a problem with the FTP sensor vent hose.
Check the FTP sensor port
Disconnect the FTP sensor vent hose from the FTP sensor. Keep the sensor's connector connected while you remove the FTP sensor from the EVAP canister. Turn the vehicle to ON mode. Check the HDS [FTP Sensor] reading. A normal reading is -0.67 to 0.67 kilopascals. If this check is abnormal, there is a problem with the FTP sensor.
This step changes the sensor's physical installation while retaining its electrical connection. The sensor is removed from the canister with its connector still connected, and the pressure reading is then checked in the stated vehicle mode. That setup distinguishes the sensor-port check from a reading taken with only the vent hose disconnected.
Evaluate the remaining canister
If all the other inspection items check out normally, the remaining EVAP canister is the cause.
After troubleshooting
After troubleshooting, clear the DTCs with the HDS.
Final check
The FTP readings and component checks can help identify the listed fault area.
The result should connect each pressure value to the setup that produced it, along with the valve's operation and corrosion findings. The initial branch and the later component conclusions answer different questions. The remaining-canister conclusion applies only when all the other inspection items are normal.
