If high voltage disappears when the sensor is unplugged, check for the sensor’s ground and for proper reference voltage supplying the sensor. If voltage is still high with the sensor unplugged, inspect the wiring harness for a short on the signal wire. If the scan tool shows voltages above 4.5V, unplug the sensor (if possible) and recheck the voltage. A fluctuation in voltage during the wiggle-test could point to connector problems such as broken wiring, corrosion or dampness. Use a digital volt/ohmmeter to measure voltage at the signal wire while wiggle-testing wiring at the FTP sensor. A reading of around 2.7V with the gas cap off might indicate an intermittent problem. Normal voltages should be around 2.5 volts, and should never exceed 4.5 volts. Pay close attention to fuel tank pressure readings, using a scan tool. With key on/engine off, use a scan tool to retrieve the code from the engine’s diagnostic connector. How does a mechanic diagnose the P045 code? Other than a hard code and illuminated malfunction indicator light (MIL), the only other symptom might be a noticeable smell of raw fuel. Please note that on some vehicles, the FTP is incorporated into the electric fuel pump assembly in the tank. In a P4053 code instance, the EVAP sensor or fuel tank pressure (FTP) sensor is sending information to the PCM that indicates a higher than normal pressure in the EVAP system. EVAP systems feature a pressure sensor that monitors the system’s integrity, and at regular intervals the EVAP system performs a pressure test on itself, checking that there are no leaks in the system. Modern emissions systems include an EVAP canister which allows fuel tank vapors to be collected and purged back into the engine, where they can be burnt rather than expelled into the atmosphere. A P0453 code means that a reading from the engine’s evaporative pressure sensor is higher than normal, indicating changes in pressure that are out of factory specification.
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