Inspection and Verification

Inspection and Verification
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 chart.

Visual Inspection Chart:

Visual Inspection Chart

3. If the concern is not visually evident, use the scan tool 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. Diagnosis By Symptom - Natural Gas - Instrument Cluster
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 NGV module cannot be accessed by the scan tool, GO to Pinpoint Test J. Test J: No Communication With the Module-Natural Gas Vehicle