Diagnostics and fuel vapor control checks

Inspection and verification

1. Check the customer complaint.

2. Perform a visual inspection for obvious signs of mechanical or electrical damage.

Visual inspection table

Mechanical factors	Electrical factors
– Vacuum line(s) – Carbon canister for the evaporative emission control system (EVAP) – EVAP system hose(s) – EVAP carbon canister purge valve	– Fuse(s) - Wiring harness – Plug connector(s)

3. If an obvious cause for the problem you identified or the customer described is found, correct it (if possible) before proceeding with further actions.

4. If the problem is not visually obvious, check the symptom and contact WDS to diagnose the system.