Initial Inspection and Diagnostic Overview

Inspection and Verification

1. Verify the customer concern by operating the system.

2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical Electrical

- Fuel vapor hoses Loose or corroded connector(s)
- 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
- For additional information, refer to Information Buss. Information Bus
- NO RESP/NOT EQUIP
- for Powertrain Control Module (PCM) concerns, Computers and Control Systems.
- 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 Symptom Chart to continue diagnostics.