Electronic Spark Control Module: Testing and Inspection

NOTE: The ignition control unit should only be tested if the engine does not start and there is no spark at the spark plugs.
To further assist you during testing, use the wiring diagrams located in CHASSIS ELECTRICAL DIAGRAMS.

CAUTION: Always turn the ignition "OFF" when connecting or disconnecting Control unit harness connectors.
Be sure to check the integrity of the wires, connectors, battery terminals and fuses before replacing an expensive component.

1. Be sure the ignition coil is in good working order. If needed, test the coil first, refer to IGNITION SYSTEMS.
2. Turn the ignition "OFF".

Hall Control Unit Testing:

3. Disconnect the harness from the ignition control unit.
4. Connect a voltmeter between terminals 2 (-) and 4 (+) of the harness connector.
5. Turn the ignition "ON".

^ Reading should be approx. 12 volts.

If not, check wiring and connectors for damage. Repair as needed and retest.

6. Measure the resistance between terminal 1 of the ignition coil and terminal 1 of the Hall control unit harness connector.

8. The correct measurement should less than 0.5 ohms (continuity).

If the correct measurement is not obtained repair or replace the harness.

6. Turn the ignition "OFF" and reconnect the Hall control unit connector.
7. Disconnect the knock control unit harness connector.

Hall Control Unit Testing:

8. Connect a voltmeter between coil terminals 1 (-) and 15 (+).

NOTE: If necessary, connect the double terminal on ignition coil terminal #1 so that only the wire to the engine harness is connected.

9. Turn the ignition "ON". Reading should be:

^ 2 volts minimum at first and then drops to 0 volts after 1 or 2 seconds

If the correct measurement is not obtained replace the Hall control unit.

Hall Control Unit Testing:

10. Briefly connect a jumper wire between terminal 12 of the Knock sensor control unit harness connector and ground.

^ The voltage must increase briefly to 2 volts minimum.

If the correct measurement is not obtained replace the Hall control unit.