Electronic Ignition With Hall Generator

The ignition control unit is fastened to a finned aluminium heat sink in order to keep the control unit from overheating. If a good control unit is plugged into the system for trouble shooting, it must fasten to the heat sink in order to prevent damage to the unit.





The following sequence is for a car which does not start.
Check idle stabilizer:
Remove both connectors from the idle stabilizer and connect them together. If engine starts, idle stabilizer is defective.
Check voltage supply to distributor:
Remove connector from distributor and connect a voltmeter to the outer terminals. With the key on, the voltmeter should show battery voltage.
If there is no voltage, before going to the next step, check the wire harness from the distributor to the control unit.





If there is no voltage at the distributor connector, check for voltage at the control unit:
Remove the connector from the control unit and connect a voltmeter between terminals 2 & 4. With the key on, the voltmeter should show about 12 volts. If the voltage is OK, then the control unit is the cause.





Check Hall generator:
Pull back the rubber boot on the control unit connector and connect a voltmeter between terminals 6 and 3. Make sure the connector is fastened securely to the control unit.
With the ignition key on and the trigger wheel shutter outside of the air gap, the voltage should be equal to or less than O.4v.





Rotate the engine until the shutter is in the air gap. The voltmeter reading should increase to about 9 volts.





Connect the voltmeter between terminals 5 and 3. With the ignition key on, the voltage should be a minimum of 7.5 volts
If any of the voltage readings are incorrect, replace the Hall generator.





Check ignition coil:
Remove all of the wires from the Coil and connect an ohmeter between terminals:
15 and 1 - resistance should be 0.52 to 0.76 ohms
4 and 1 - resistance should be 2.4 to 3.5k ohms





Check ignition control unit
Remove connector from distributor. Connect positive lead of voltmeter to terminal 15. Connect negative lead to terminal 1 of ignition coil. Turn ignition on. Voltmeter will show about 6 volts and must drop to 0 within 1 or 2 seconds. If the voltage does not drop, replace the control unit.