Electronic Ignition Timing Control

Ignition timing is calculated by PCM according to information supplied by various sensors. A signal is sent from PCM to distributor igniter and changes ignition timing accordingly. If a fault occurs in Camshaft Position (CMP) sensor circuit or CMP sensor fails, DTC P0340 can set in PCM memory. For testing procedures, see TESTS W/CODES article. For adjusting procedures, see IGNITION TIMING in ADJUSTMENTS article.