Ignition Systems - Integrated Electronic Ignition
Six Cylinder Integrated Electronic (EI) Ignition Waveforms
The PCM acts as an electronic switch to ground in the coil primary circuit. When the switch is closed, battery positive voltage (B+) applied to the coil primary circuit builds a magnetic field around the primary coil. When the switch opens, the power is interrupted and the primary field collapses inducing the high voltage in the secondary coil windings and the spark plug is fired. A kickback voltage spike occurs when the primary field collapses. The PCM uses this voltage spike to generate an Ignition Diagnostic Monitor (IDM) signal. IDM communicates information by pulsewidth modulation in the PCM.
Typical Crankshaft Position (CKP) Sensor
Camshaft Position (CMP) Sensor
Horizontal Connector Six Tower Coil Pack
Series 5 Six Tower Coil Pack
Series 5 Four Tower Coil Pack