P0452
DTC P0452
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 less than 0.1 volt, DTC P0452 sets.
The table illustrates the relationship between the FTP sensor signal voltage and the EVAP system pressure/vacuum.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
P0452 Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage
CONDITIONS FOR RUNNING THE DTC
DTC P0452 runs continuously when the ignition is ON.
CONDITIONS FOR SETTING THE DTC
- The FTP voltage is less than 0.1 volt.
- The above condition is 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 MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- 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 emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
DIAGNOSTIC AIDS
The rear body pass-through connector may be a convenient point for testing.
TEST
