Engine Controls - Basic Testing - 5.4L: Summary

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to SELF-DIAGNOSTICS in appropriate article:

For gasoline vehicles, see TESTS W/CODES - 5.4L GASOLINE .

For CNG vehicles, see TESTS W/CODES - 5.4L CNG .

If no trouble codes are found in self-diagnostics, proceed to appropriate article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures:

For gasoline vehicles, see TESTS W/O CODES - GASOLINE .

For CNG vehicles, see TESTS W/O CODES - 5.4L CNG .