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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 25 (Engine Controls - Tests W/Codes - 2.5L) >> Self-Diagnostic System >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. 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 the 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.