Hall Effect Sensor: Testing and Inspection

1. Ensure that the following components are OK,
a. Hall control unit.
b. Ignition coil.
c. Wiring between Hall control unit and ignition coil.
d. Connector pins and sockets on Hall generator, distributor and Hall control unit.
2. Disconnect harness plugs from the idle stabilizer and connect them together.
3. Disconnect coil wire from center of distributor cap and connect to ground using a jumper wire.
4. Pull rubber boot back from Hall control unit plug.
5. Connect voltmeter positive lead to terminal 6 and negative lead to terminal 3.
6. Turn ignition switch ON.
7. Slowly turn engine manually (in running direction) while observing voltmeter.
8. Voltage should be:

Fig. 37 Testing Hall Sending Unit With Shutter Open:

From 0 to .7 V DC when aperture rotor is open to Hall generator, Fig. 37

Fig. 36 Testing Hall Sending Unit With Shutter Closed:

From 1.8 V DC to battery voltage when aperture rotor is closed to Hall generator, Fig. 36

9. If voltage is not within specification, replace Hall generator.
10. Pull back boot on wiring harness connector to Hall generator at distributor.
11. Connect positive lead of voltmeter to green wire terminal and negative lead to black/white wire terminal, leaving plug connected to distributor.
12. Switch ignition ON and observe meter while manually rotating engine.
13. If reading alternates between 0 and 2 volts, Hall generator is satisfactory.
14. If reading does not alternate between 0 and 2 volts, replace Hall generator.
15. If no start condition persists, replace ignition coil.
Note: In isolated cases, malfunctions in Hall system cannot be located using previous procedure and related component tests. If this condition persists, substitute new control unit or Hall generator and retest system.