Download 1. Verify the customer concern by operating the system. 2. Visually inspect for obvious signs of mechanical or electrical damage. Visual Inspection Chart Mechanical Fuel vapor hoses EVAP canister Vapor management valve (VMV) 3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step. 4. If the NGS tester does not power up, refer to the New Generation STAR tester manual. 5. Carry out the DATA LINK DIAGNOSTIC TEST. If the NGS tester responds with: CKT914, CKT915 or CKT70-ALL ECUS NO RESP/NOT EQUIP, REFER to Section 418-00. NO RESP/NOT EQUIP for Powertrain Control Module (PCM), REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual. System passed, retrieve and record the continuous diagnostic trouble codes (DTCs). 6. If the DTCs retrieved are related to the concern, go to the Diagnostic Trouble Code (DTC) Index. 7. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.