All Models (Except GLI & GTI)

Disconnect Hall control unit. Set Digital Multimeter (US 1119 ) on 20 volt scale. Connect multimeter between negative terminal 2 and positive terminal 4 of Hall control unit connector.
Turn ignition on. Meter should indicate battery voltage. If reading is incorrect, find open wire in circuit and repair as necessary. Turn ignition off and reconnect control unit.
Remove terminal on Hall Effect sending unit. Connect digital multimeter between negative terminal 1 and positive terminal 15 on ignition coil. Turn ignition on.
Initial meter reading should be 2 volts minimum, then voltage must drop to zero after 1-2 seconds. If reading is incorrect, replace Hall control unit.
Check ignition coil and see if any sealing compound has leaked out. Replace coil if necessary. Briefly tap connector center terminal against engine ground.
Displayed voltage must increase a minimum of 2 volts for a short time. If reading is incorrect, find open in center wire and repair as necessary. If okay, replace Hall control unit. Turn ignition off. Connect multimeter to outer terminals from sending unit.
Turn ignition on. Voltage reading must be 5 volts minimum. If there is still a problem in spite of correct voltage readings, try to find fault in wiring between sending unit and Hall control unit. If no fault can be found replace control unit.
If wiring, ignition coil, and Hall control unit are okay, disconnect coil high tension wire from distributor and connect to ground. Remove rubber grommet from connector at Hall control unit. DO NOT disconnect unit.
Connect multimeter between connector terminal 3 and 6. Turn ignition on. Turn engine crankshaft, by hand, and note reading on meter. Voltmeter should display 0-2 volts alternating voltage. If not, Hall Effect sending unit is defective.