EVAP Purge Flow Sensor Circuit High

Where it lives

For P0468, the circuit described runs through the sensor. The description of P0468 reports a fault at the sensor.

Check these first

• A purge flow sensor reporting a signal above its expected range
• A short to voltage on the sensor signal wire
• An open in the sensor ground circuit
• A cracked or disconnected purge line at the sensor

What to do next

1. Inspect the sensor wiring for a short to voltage
2. Check the ground circuit for opens and high resistance
3. Read the purge flow signal with the key on and engine off
4. Inspect the purge line for cracks, splits or a loose connection
5. Check the purge valve for a stuck open condition
6. Replace the purge flow sensor if the signal stays high on a good circuit

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