Electronic Ignition Timing Control

Ignition timing is calculated by PCM based on current engine status. PCM receives signals indicating vehicle speed, manifold vacuum, throttle position and engine coolant temperature. PCM selects an appropriate, preprogrammed ignition timing adjustment. A signal is sent from PCM to ignition control module and changes ignition timing accordingly.

For adjusting procedures, see IGNITION TIMING in ADJUSTMENTS - 1.0L article. Diagnostic Trouble Code (DTC) P1530 can set in PCM memory during ignition timing adjustment. For testing procedures, see TESTS W/CODES - 1.0L article.