EVAP System Leak Detection Pump Sense Circuit Range/Performance

Where it lives

For P2404, the part to look at first is the pump named here.

Check these first

• A pump sense signal that drifts outside its expected range
• A failing leak detection pump
• High resistance in the pump sense wiring
• An intermittent connection at the pump sense connector

What to do next

1. Read the pump sense value on a scan tool and compare it to the commanded pump state
2. Measure resistance of the pump sense wire
3. Wiggle test the pump sense connector while watching the signal
4. Check the pump for correct output
5. Replace the leak detection pump if the circuit tests good
6. Clear the code and retest

Look up another code