How do you correct a code P1441 on a 1996 Nissan pickup?

Answer 1

This usually indicates a faulty Evaporative Emission (EVAP) Vacuum Cut Valve/Bypass Valve.

1. Verify battery voltage to the EVAP vacuum cut valve bypass valve on the Black/White wire with the key ON.

2. Verify the Green/White ground wire for the EVAP vacuum cut valve bypass valve is good all the way to the ECM. The Green/White wire goes to terminal 117 on the ECM.

3. Verify the EVAP vacuum cut valve bypass valve is closed (can not blow through it by mouth) when the EVAP vacuum cut valve bypass valve is de-energized.

4. Verify the EVAP vacuum cut valve bypass valve opens (can blow through it by mouth) with the valve powered up and grounded.

5. Check the EVAP vacuum cut valve to verify it allows flow only one way.