Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
HITACHI Electronic Ignition: Description
The Hitachi electronic ignition consists of a housing, rotor and distributor cap. See Fig 1. A reluctor, mounted on the shaft and governor assembly, combines with the pick-up coil to replace the conventional cam and breaker points.
With the ignition on, the distributor reluctor rotates past the pick-up coil. As each tooth of the reluctor approaches and passes the pick-up coil, a signal is sent to the ignition control unit. The control unit then turns the primary circuit in the ignition coil on and off as each tooth passes the pick-up coil.
This switching causes a build-up and collapse of a magnetic field in the coil, resulting in a high voltage surge in the coil's secondary circuit. This high voltage surge fires the spark plugs. See Fig 2.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.