Note. For circuit reference, see WIRING DIAGRAMS article.
Scheme 9
Circuit Description
The enhanced ignition system uses the Crankshaft Position (CKP) sensor in order to provide a timing input to control module. Ignition Control (IC) spark timing for each cylinder is based on this input. The control module provides ignition timing signal to Ignition Control Module (ICM) to control the ignition coil. Each timing pulse detected by ICM allows PCM to energize ignition coil. A large secondary ignition voltage is induced in the secondary coil by the primary coil. This high voltage is switched to the correct spark plug by the distributor. This DTC will set if PCM detects an unusually high or low voltage on the ignition timing signal circuit.