Self-Diagnostic System Check
SELF-DIAGNOSTIC SYSTEM CHECK is an organized approach to identifying a computer-controlled electronics problem. Understanding chart and using it correctly will reduce diagnostic time and prevent unnecessary parts replacement.
Use SELF-DIAGNOSTIC SYSTEM CHECK to begin diagnosis if any customer complaint does not directly relate to a specific subsystem. If SERVICE ENGINE SOON light fails to glow during cranking, problem could be in PCM power supply circuit. SELF-DIAGNOSTIC SYSTEM CHECK will direct technician to an appropriate diagnostic chart.
If DIC panel display is not operating properly, PCM computer self-diagnostics mode cannot be used and SELF-DIAGNOSTIC SYSTEM CHECK will direct technician to an appropriate diagnostic chart.
If a trouble code is identified by PCM computer system self-diagnostics mode, problem can be corrected following appropriate numbered code charts. If no trouble code has been identified, SELF-DIAGNOSTIC SYSTEM CHECK will direct technician to an appropriate diagnostic chart.