Engine Controls - Tests W/Codes - 4.3L: Introduction: Notes

Most engine control problems result from mechanical failures, poor electrical connections or damaged vacuum hoses. Before condemning the computer system, perform checks and inspections covered in appropriate F - GASOLINE BASIC TESTING article in this section. See list below. Failure to do so may result in lost diagnostic time.

• F - BASIC TESTING (for Astro & Safari)
• F - BASIC TESTING (for "S" & "T" Series)
• F - BASIC TESTING - GASOLINE (for "C" & "K" Series)
• F - BASIC TESTING - GASOLINE (For "G" & "P" Series)

If no faults were found while performing BASIC TESTING PROCEDURES, proceed with DIAGNOSTIC PROCEDURE. If no fault codes or only a non-running Code 12 is present and driveability problems exist, proceed to appropriate TESTS W/O CODES article in this section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.). If only intermittent codes are present, see INTERMITTENTS in appropriate TESTS W/O CODES article in this section. See list below.

• H - TESTS W/O CODES (for Astro & Safari)
• H - TESTS W/O CODES (for "S" & "T" Series)
• H - TESTS W/O CODES - GASOLINE (for "C" & "K" Series)
• H - TESTS W/O CODES - GASOLINE (For "G" & "P" Series)