Circuit Description
The EVAP system contains:
- Fuel tank
- Fuel filler neck
- Fuel cap
- Vapor hose(s)
- Charcoal canister
- Vapor canister purge solenoid valve (EVAP canister purge control solenoid valve)
- EVAP system leak detection pump
- Pressure sensor
- ECM/PCM
- Diagnostic trouble codes (DTCs)
Symptoms
- MIL (Malfunction Indicator Lamp) illumination
- Possible fuel vapor odor inside or outside the vehicle
Possible Causes
- LDP circuit open or shorted
- LDP faulty
- ECM faulty
Diagnostic Trouble Code (DTC) Detection Conditions
- The ECM continuously monitors the status of the LDP control circuit.
- The ECM sets DTC P1457 when any of the following occurs for more than 2 seconds.
- The LDP control circuit is open for 35 ms or longer.
- The LDP control circuit is shorted to voltage for 35 ms or longer.
Component(s) Associated with DTC
- Leak Detection Pump (LDP)
- Evaporative Emission System (EVAP) Canister Purge Solenoid Valve
- Pressure Sensor
Leak Detection Pump (LDP) Location
The leak detection pump is located at the rear of the vehicle, near the fuel tank.
Evaporative Emission System (EVAP) Canister Purge Solenoid Valve Location
The evaporative emission system (EVAP) canister purge solenoid valve is located on top of the engine.
Pressure Sensor Location
The pressure sensor is located on the EVAP canister.
