DTC P2421: Notes

DTC P2421  : Evaporative Emission (EVAP) Canister Vent Shut Valve Stuck Open

Special Tools Required 

Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000B or equivalent, commercially available 

Vacuum/Pressure Gauge, 0-4 inHg 07JAZ-001000B 

How to use this manual .

NOTICE:  

• Before you troubleshoot, review the How to Troubleshoot .
• The fuel system is designed to allow specified maximum vacuum and pressure conditions. Do not deviate from the vacuum and pressure tests as indicated in these procedures. Excessive pressure/vacuum would damage the EVAP components or cause eventual fuel tank failure.