Engine Control System Tests W/Codes - 2.7L: Introduction: Notes

If no faults were found while performing basic diagnostic procedures in BASIC TESTING - 2.7L , proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) are present after entering self-diagnostics, proceed to TESTS W/O CODES - 2.7L article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).