P0452

Schematic:

CIRCUIT DESCRIPTION
The fuel tank pressure sensor is used in order to monitor the vacuum levels in the fuel tank. The fuel tank pressure sensor responds to the changes in the fuel tank pressure or vacuum. The signal voltage to the Powertrain Control Module (PCM) varies from a minimum of about 0.2 volts with pressure in the fuel tank to above 4.0 volts with a high vacuum in the fuel tank.

CONDITIONS FOR RUNNING THE DTC
The engine is running.

CONDITIONS FOR SETTING THE DTC
The fuel tank pressure sensor voltage is lower than 0.1 volt for more than 25 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The Malfunction Indicator Lamp (MIL) will illuminate.
^ The PCM will record the operating conditions at the time that the diagnostic fails. The Freeze Frame and Failure Records buffers will store this information.
^ A history DTC stores.

CONDITIONS FOR CLEARING THE MIL/DTC
^ Tue Malfunction Indicator Lamp (MIL) will turn OFF after 3 consecutive ignition cycles in which the diagnostic runs without a fault
^ A history DTC will clear after 40 consecutive warm up cycles without a fault.
^ Use a scan tool to clear the DTCs.

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the condition is present.
4. This step tests the 5 volt reference of the fuel tank pressure sensor.
5. This step tests if another component is causing the 5 volt reference circuit condition. If the voltage increases when a component is disconnected, replace that component.
6. If the scan tool displays 5 volts, the Fuel Tank Pressure sensor signal circuit, the Fuel Tank Pressure sensor 5 volt reference circuit and the PCM are OK.