P0453
DTC P0453
CIRCUIT DESCRIPTION
The fuel tank pressure (FTP) sensor measures the difference between the air pressure or vacuum in the Evaporative Emission (EVAP) System, and the outside air pressure. The engine control module (ECM) supplies the following circuits to the FTP sensor:
- A 5-Volt reference circuit
- A low reference circuit
- A signal circuit
The FTP sensor signal circuit voltage varies depending on EVAP system pressure or vacuum. If the ECM detects that the FTP sensor signal voltage is more than 4.9 volts, DTC P0453 sets.
The table illustrates the relationship between FTP sensor signal voltage and the EVAP system pressure/vacuum.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0453 Fuel Tank Pressure (FTP) Sensor Circuit Voltage
CONDITIONS FOR RUNNING THE DTC
DTC P0453 runs continuously when the ignition is ON.
CONDITIONS FOR SETTING THE DTC
- The FTP sensor voltage is more than 4.9 volts.
- The condition is are present for more than 10 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
CONDITIONS FOR CLEARING THE DTC
- A current DTC Last Test Failed clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Clear the DTC with a scan tool.
TEST
