Ignition Hall Effect Sensor: Testing and Inspection

TESTING PROCEDURE:

NOTE: While trouble shooting, always check the wiring, fuses and connectors for good condition and routing. Use the wiring diagrams found in SCHEMATIC DIAGRAMS to supplement your testing efforts.

Accessing Ignition ECU Connector:

1. Turn ignition OFF.
2. Access ignition ECU by removing the panel under left hand side of instrument panel.
3. Remove ECU connector by pushing out the catch and folding out the wire cluster.

Checking Ground Connections:

4. Check ignition ECU ground connections at intake manifold. They should make good contact.

Removing Protective Cover:

5. Remove connector protective sleeve.
IMPORTANT: ^ Never check connections from the front. Connectors can get damaged and worsen the problem.
^ Check connections through the holes in the connector.
^ Connection pin numbers are printed on the connector side.

Checking Terminal Pins:

6. Check that terminal contacts have been pushed down evenly in connector.
7. If any connectors have been pushed down to far, poor connection may result.
8. Reconnect ECU connector without protective sleeve.

Checking Hall-Sensor Terminal #3:

9. Disconnect distributor connector.
10. Turn ignition ON.
11. Connect a voltmeter between positive terminal #3 (red) and ground.

Reading should be: 12 volts

If not, check and repair wiring to ECU.

Checking Hall-Sensor Terminal #2:

12. Connect a voltmeter between terminal #2 (blue) and ground.

Reading should be: 5 volts

If not, check and repair wiring to ECU.
13. Turn ignition OFF.

Checking Hall-Sensor Terminal #1:

14. Connect an ohmmeter between terminal #1 (black) and ground.

Reading should be: 0 ohm

If not, check and repair wiring to ECU. If wiring is in good condition, fault is ECU or ECU ground connection related, see ELECTRONIC CONTROL UNIT. Repair as needed.
15. Reconnect distributor connector.

Checking Hall-Sensor:

16. Disconnect white-red and blue leads from ignition coil to prevent arcing damage.
17. Connect a voltmeter at rear of ECU connector between pin 24 (blue) and ground.
18. Turn ignition ON.
19. Rotate crankshaft by hand.

Reading should be: over 1.8 volts when a vane passes hall sensor

Reading should be: less than 0.7 volts when an opening passes hall sensor

If reading is incorrect, replace and retest with new hall sensor unit.
20. Turn ignition OFF.
21. After testing, disconnect all test equipment, reinstall protective sleeve and reconnect all connectors (including the ECU connector) and remount all panels.