Chart C-3A EVAP Solenoid Purge Valve Check

Chart C-3A EVAP Solenoid Purge Valve Check:

EVAP Solenoid Electrical Schematic:

CIRCUIT DESCRIPTION
The use of the evaporative emissions canister is controlled by the Engine Control Module (ECM) through the Evaporative Emission Solenoid Purge (EVAP SP) valve. Only when the following conditions are satisfied will the ECM open the vacuum passage of the EVAP SP valve:

1. The engine has achieved normal operating temperature.
2. Engine speed is higher than a specified value.
3. Throttle valve opening not in the idle position.
4. Engine is running within a specified load.

When all of the above conditions have been satisfied, the fuel vapor is allowed to pass from the EVAP canister through the EVAP SP valve and purge hose to the intake manifold.

TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.

1. Checks for an open in WHT/BLU wire between FI relay and EVAP SP valve.
2. Checks for an open or a short to ground in RED/GEN wire between EVAP SP valve and ECM, a faulty ECM or a faulty EVAP SP valve.