Self-Diagnostic System Check
SELF-DIAGNOSTIC SYSTEM CHECK is an organized approach for identifying a computer-controlled electronics problem. Understanding this chart and using it correctly will reduce diagnostic time and prevent unnecessary replacement of parts.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Use SELF-DIAGNOSTIC SYSTEM CHECK to begin diagnosis if any customer complaint does not directly relate to a specific subsystem. If Malfunction Indicator Light (MIL) fails to illuminate during cranking, problem could be in PCM power supply circuit. SELF-DIAGNOSTIC SYSTEM CHECK will direct technician to an appropriate diagnostic chart, test procedure or article in section. If DIC panel display is not operating properly, PCM self-diagnostics mode cannot be used and SELF-DIAGNOSTIC SYSTEM CHECK will direct technician to an appropriate diagnostic chart, test procedure or article in section. If a diagnostic trouble code is identified by PCM computer system self-diagnostics mode, problem can be corrected following appropriate numbered code charts. If no diagnostic trouble code has been identified, SELF-DIAGNOSTIC SYSTEM CHECK will direct technician to an appropriate diagnostic chart, test procedure or article in appropriate section. If no diagnostic trouble codes are present and no messages have been displayed, check appropriate system for which is exhibiting problem condition. Refer to appropriate diagnostic chart, test procedure or article in appropriate section.