DTC Advanced Diagnostics: P1454
DTC P1454:Fuel Tank Pressure (FTP) Sensor Circuit Range/Performance Problem

General Description


The fuel tank pressure is about 0 kPa (0 mmHg, 0 inHg) when starting a cold engine. When the fuel tank pressure (FTP) sensor output value is out of a specified range and the powertrain control module (PCM) judges that there‘s no other cause [no evaporative emission (EVAP) canister vent shut valve failure, etc.] for the FTP sensor zero point shift, the PCM detects an FTP sensor malfunction. However, if the FTP sensor output when starting the engine, is a prescribed negative value or less (excessive negative pressure is detected), the malfunction judgment should be done as follows because it is difficult to distinguish the FTP sensor zero point shift (P1454) from the EVAP canister vent shut valve failure (P2422).
1.
If neither Pending DTCs (P1454 nor P2422) are stored, both Pending DTCs are stored when excessive vacuum is detected at engine start.
2.
If both Pending DTCs (P1454 and P2422) are stored and excessive vacuum is detected, both Confirmed DTCs are stored.
3.
If either Pending DTC (P1454 or P2422) is stored and excessive vacuum is detected, the PCM stores the Confirmed DTC which the Pending DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Once per driving cycle
Sequence
P0452, P0453 are judged as OK
Duration
8.0 seconds or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
Elapsed time after starting the engine
10 seconds
–
Other
The EVAP canister vent shut valve is open
The EVAP canister purge valve is closed (the system is not purging)

Malfunction Threshold
The FTP sensor output fluctuates by 0.7 kPa (5 mmHg, 0.2 inHg) or more, or -0.7 kPa (-5 mmHg, -0.2 inHg) or less, for at least 8.0 seconds.
The FTP sensor output [FTP SENSOR] value is -1.4 kPa (-10 mmHg, -0.4 inHg) or less for at least 8.0 seconds.

[ ]: HDS Parameter

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
FTP sensor failure

Confirmation Procedure
Operating Condition
1.
Start the engine, and let it idle until the radiator fan comes on.
2.
When the diagnosis does not finish at idle, drive at 30 - 75 mph (48 - 120 km/h) at EVAP canister purge valve duty [EVAP PC DUTY] 20 % or more.
Drive the vehicle in the manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.