Nissan 22157-21E01 Rotor - Head

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The Datsun/Nissan electronic ignition system, introduced in 1975, evolved from a transistorized circuit to an Integrated Circuit system and later to a dual spark plug system to meet emission laws. It ignites the compressed gas in the cylinders at the precise moment using a spark from the spark plugs. Some models use a crankangle sensor in the distributor as part of the Electronic Concentrated Control System (E.C.C.S.), which requires no adjustments. Maintenance involves inspecting and replacing spark plug wires, rotor head, and distributor cap every 30,000 miles or 24 months. Diagnosis, testing, and parts replacement should follow service charts.