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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Tests W/Codes - 5.2L CNG) >> Self-Diagnostic System >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: DO NOT skip any steps in self-diagnostic tests, or incorrect diagnosis may result.

Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION  . Enter on-board diagnostics, and retrieve DTCs. Refer to the ENTERING ON-BOARD DIAGNOSTICS  . If DTCs are not present and/or Diagnostic Readout Box (DRB) or generic scan tool is used, proceed to one of the following tests: