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Which trigger replaced the contact breaker in early electronic systems?

  • A.An optical sensor, which is the only arrangement used in electronic ignition systems fitted to production vehicles
  • B.A pressure sensor
  • C.A crankshaft position sensor, which reads a toothed wheel and is the arrangement used in distributorless systems
  • D.A magnetic pulse generator or Hall effect sensor

Answer: D

Reluctor and Hall sensors in the distributor triggered the module without contacts to wear. Crankshaft sensors came with distributorless ignition, which makes the last option correct for a later generation. Optical triggers genuinely were used by some manufacturers. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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