Self-Diagnostic System: Notes

The PCM is equipped with a self-diagnostic system which detects system failures or abnormalities. When a malfunction occurs, PCM illuminates the SERVICE ENGINE/THROTTLE SOON light located on instrument panel. When malfunction is detected and light is turned on, a corresponding trouble code is stored in PCM memory. Malfunctions are designated as either "hard failures" or "intermittent failures". For procedures on retrieving stored codes, see appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section below.

• TESTS W/CODES - 2.2L (for S10 Pickup)
• TESTS W/CODES - 4.3L (for all others)