Fuel Tank Leak Detection Control Module -J909 - / Fuel Tank Pressure Sensor -G400-, Checking: Notes

GENERAL DESCRIPTION 

The System Can Test The Evaporative System Integrity By Using Natural Vacuum After The Engine Is Shut Off. The Engine Control Module -J623- Monitors The Ability Of The System To Maintain Vacuum Through Signals Sent From The Fuel Tank Pressure Sensor -G400- / Fuel Tank Leak Detection Control Module -J909-. If The Vacuum Remains For A Specified Period Of Time, Then There Are No Evaporative Leaks, And A Pass Is Reported By The Engine Control Module -J623-. If There Is A Leak, The System Either Will Not Achieve A Vacuum, Or A Vacuum Cannot Be Maintained. Usually A Fault Can Only Be Detected After A Cold Start.

Special Tools And Workshop Equipment Required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.
• Hand Vacuum pump.
• EVAP Smoke Tester.

TEST REQUIREMENTS 

• Fuses OK.
• Battery voltage OK.
• Switch OFF All electrical and electronic accessories.
• Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
• Vehicles with Manual Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
• Observe all safety precautions: SAFETY PRECAUTIONS .
• View clean working conditions: CLEAN WORKING CONDITIONS .
• For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .