Natural Gas Vehicle

1. Verify the customer concern by operating the system.
2. Visually inspect the components of the system for obvious signs of mechanical or electrical damage, using the following chart.

VISUAL INSPECTION CHART

Mechanical
- Damaged fuel tank(s)
- Damaged solenoid(s)
- Damaged fuel line(s)

Electrical
- Damaged fuse(s)
- Circuitry
- Damaged sensor or transducer

3. If the concern is not visually evident, use the New Generation Star (NGS) Tester to retrieve Diagnostic Trouble Codes (DTCs) and perform the On-Demand Self Test.

4. If the On-Demand Self Test is passed and no DTCs are retrieved, proceed to the Symptom Chart. Symptom Related Diagnostic Procedures

5. If DTCs are retrieved, proceed to the Natural Gas Vehicle (NGV) Module Diagnostic Trouble Code (DTC) Table. Diagnostic Trouble Code Tests and Associated Procedures

6. If the Natural Gas Vehicle (NGV) module cannot be accessed by the New Generation Star (NGS) Tester, GO to Pinpoint Test J. J: No Communication With The Module NGV