Part 1

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456: Evaporative Emission Control System Leak Detected (Gross Leak)


Part 1 of 2

DTC SUMMARY





DESCRIPTION

The circuit description can be found in the EVAP (Evaporative Emission) System Component Tests and General Diagnostics.

INSPECTION PROCEDURE

Refer to the EVAP System Component Tests and General Diagnostics.

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned off, the electric vacuum 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
*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.





HINT






* P0455: EVAP (Evaporative Emission ) gross leak

* In operation C, the vacuum 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 vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than the 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).





Continued in Part 2 P0455