DTC P0451: Fuel Tank Pressure (FTP) Sensor Range/Performance Problem: General Description
The fuel tank pressure (FTP) sensor is installed on the evaporative emission (EVAP) canister. The FTP sensor is used to detect leaks in the EVAP system. The engine control module (ECM) monitors the FTP sensor output voltage. The FTP sensor output voltage rises as the fuel tank pressure increases. Conversely, the FTP sensor output voltage drops as the fuel tank pressure decreases. Rapid changes in the FTP sensor output voltage due to electrical noise or an intermittent open during the EVAP leak detection may cause incorrect leak detection, so abnormal output is monitored.
If the FTP sensor output voltage changes a specified number of times within a set time, the ECM detects a malfunction and stores a DTC.
MONITOR EXECUTION, SEQUENCE, DURATION, DTC TYPE, OBD STATUS
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 20 seconds or more |
| DTC Type | Two drive cycles, MIL ON |
| OBD Status | PASSED/FAILED/NOT COMPLETED (STILL TESTING) |
ENABLE CONDITIONS CHART
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time after starting the engine 2 | seconds | - |
| Throttle position | Fully closed | |
| No active DTCs | P0122, P0123, P0222, P0223, P0452, P0452, P0453, P0453, P2101, P2108, P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176, U0107 | |