SHOE 7S9557 - Caterpillar

Illustration 1 g00822915
(1) Ignition transformer
(2) Tube
(3) Extension
(4) Spark plug Each cylinder has an ignition transformer. To initiate combustion, the ECM sends a pulse of approximately 108 volts to the primary coil of each ignition transformer at the appropriate time and for the appropriate duration. The transformer increases the voltage which creates a spark across the spark plug electrode.Detonation sensors monitor the engine for detonation. The engine has one detonation sensor for each two adjacent cylinders. The sensors generate data on vibration that is processed by the ECM in order to determine detonation levels. If detonation reaches an unacceptable level, the ECM retards the ignition timing of the affected cylinder or cylinders. If retarding the timing does not limit detonation to an acceptable level, the ECM shuts down the engine.The ECM provides extensive diagnostics for the ignition system.