When

The pressure is not down to zero when the purge valve is open.

Follow these steps

  1. For the pressure sensor for which the pressure is not down to zero, check the pressure sensor cable and connector for proper contact.

  1. Unplug the pressure sensor cable.
  2. Reconnect the cable. To ensure proper contact push the cable firmly into the connector.
  1. Perform a self-test.

  2. If the self-test produces a message, follow the remedial actions recommended for the message.