Hall Control Unit Test
- Ensure ignition coil is okay. Disconnect plugs from idle stabilizer and connect them together. Disconnect Hall control unit. Connect voltmeter positive lead to terminal 4, and negative lead to terminal 2 on control unit connector.
- Turn ignition on. Voltmeter should indicate battery voltage. If not, check for open circuit in wiring. Repair as necessary. Turn ignition off and reconnect Hall control unit.
- Disconnect Hall generator connector from distributor. Connect voltmeter negative lead to terminal 1, and positive lead to terminal 15 on ignition coil. Turn ignition on.
- Voltmeter reading should be 2 volts minimum, then voltage must drop to zero after 1-2 seconds. If reading is incorrect, replace Hall control unit and ignition coil.
- Briefly tap center wire from disconnected Hall generator sending unit connector to ground. Voltage must increase briefly to a minimum of 2 volts. If not, check for open circuit in wiring to Hall control unit. If wiring is okay, replace Hall control unit. Turn ignition off.
- Connect voltmeter to outer terminals of Hall generator connector. Turn ignition on. Voltmeter should indicate a minimum of 5 volts. If reading is correct, but defect still exists, replace ignition system control unit and check for open wiring between generator and control unit. Repair as necessary.