P0452
DTC P0452 Fuel Tank Pressure Sensor Low InputWiring Diagram:
Circuit Description
The evaporative (EVAP) emission system includes the following components:
- Fuel tank.
- EVAP emission vent solenoid.
- Fuel tank pressure sensor.
- Fuel pipes and hoses.
- Fuel vapor lines.
- Fuel cap.
- EVAP emission canister.
- Purge lines.
- EVAP emission canister purge valve.
- EVAP emission service port.
The EVAP emission system is checked by applying vacuum to the EVAP emission system and monitoring for a vacuum decay. The engine control module (ECM) monitors the vacuum level through the fuel tank pressure sensor signal.
At the appropriate time, the EVAP emission canister purge valve and the EVAP emission vent solenoid are turned ON, allowing the engine to draw a small vacuum on the entire EVAP emission system. After the desired vacuum level has been achieved, the EVAP emission canister purge valve is turned OFF, sealing the system.
The ECM supplies a 5 V reference signal and a ground to the Fuel Tank Pressure sensor. The fuel tank pressure sensor sends a voltage signal back to the ECM relative to the fuel tank pressure.
The voltage signal will vary from 0.2 v to 4.8 v.
Conditions for Setting the DTC
- Output is less than 5 AD counts (0.0978 volt).
- Ignition ON.
Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.
Conditions for Clearing the MIL/DTC
- The MIL will turn off at the end of 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.
- DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
If a DTC P0452 cannot be duplicated, the information included in the Freeze Frame data can be useful. Use the scan tool information data to determine the status of the DTC. If the DTC occurs intermittently, using the Diagnostic table may help isolate the problem.
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DTC P0452 - Fuel Tank Pressure Sensor Low Input