Distributor Ignition

The ignition coil is grounded (triggered) by the Ignition Control Module (ICM). When coil is grounded, secondary voltage from the ignition coil is then distributed to each spark plug by the distributor.

The ICM is switched on and off by the Engine Control Module (ECM)/Powertrain Control Module (PCM). ECM/PCM uses input signals from Top Dead Center (TDC), Cylinder Position (CYP) and Crankshaft Position (CKP) sensors for basic ignition timing. In addition, ignition timing is influenced by Throttle Position (TP) sensor, Engine Coolant Temperature (ECT) sensor and Manifold Absolute Pressure (MAP) sensor.