Hall Control Unit, Checking

Hall control unit, checking

Work sequence

Test condition:
ignition coil OK, ignition OFF






- disconnect both plugs from idle stabilizer and connect them together (arrow)






- remove connector from Hall control unit
- connect voltmeter with + (plus) to terminal 4 and with - (minus) to terminal 2 in connector
- turn ignition ON
spec = approx. battery voltage
if not, check for wire breaks and repair (see wiring diagram)

- turn ignition OFF
- reconnect connector to Hall control unit
- disconnect Hall generator connector from ignition distributor






- connect voltmeter with + (plus) to terminal 15 and with - (minus) to terminal 1 of ignition coil
- turn ignition ON
spec. = 2 volts (min) for about 1 - 2 seconds and then drops to 0 volts
if not, replace Hall control unit and ignition coil

- touch center wire of connector on distributor briefly to ground
indicated voltage must increase briefly to 5 - 6 volts
if not, check for wire break in center wire and repair or replace Hall control unit if wire is OK

- turn ignition OFF






- connect voltmeter to outer terminals of Hall generator connector
- turn ignition ON
spec. = 5 volts (min)


Note: If readings are within specifications, but defect still exists, replace Hall control unit or check for wire breaks between Hall generator connector and Hall control unit; if necessary, repair


Note:
Metal shavings or other debris between the ignition control unit and heat sink can cause stress which may damage internal circuits of the control unit:
When replacing ignition control unit, thoroughly clean heat sink before assembly.