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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Engine Controls - Tests W/Codes - 2.5L) >> Self-Diagnostic System >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 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. Ensure self-diagnostic tests apply to engine being tested.

If no trouble codes were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION . Enter on-board diagnostics, and retrieve trouble code(s) using MIL or scan tool. Refer to ENTERING ON-BOARD DIAGNOSTICS . If trouble codes are not present and/or scan tool is used, proceed to TEST TC-1A. Perform indicated VERIFICATION PROCEDURE test after repairs.