Refer to the EVAP System See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/EVAP System.
MONITOR DESCRIPTION
5 hours*1 after the engine switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission)
system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.
HINT
*1: If the engine coolant temperature is not below 35锟斤拷C (95锟斤拷F) 5 hours after the engine switch is turned off, the monitor check
starts 2 hours later. If it is still not below 35锟斤拷C (95锟斤拷F) 7 hours after the engine switch is turned off, the monitor check starts 2.5
hours later.
*2: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
- P0455: EVAP (Evaporative Emission) gross leak
- In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured.
If the stabilized system pressure is higher than [second 0.02 inch leak pressure standard x 0.2] (near atmospheric pressure), the ECM
determines that the EVAP system has a large leak, illuminates the MIL and sets the DTC (2 trip detection logic).
- P0456: EVAP very small leak
- In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured.
If the stabilized system pressure is higher than second 0.02 inch leak pressure standard, the ECM determines that the EVAP system has a small
leak, illuminates the MIL and sets the DTC (2 trip detection logic).
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