Electronic Spark Control Module: Testing and Inspection

Ignition Coil With Power Output Stage:

It is not necessary to test the power output stage unless there is no spark or intermittent spark.


1. Disconnect harness connector from power output stage.

2. Connect DVM between terminals #1 and #3 of harness connector, set to 20 volt scale.

3. Turn ignition ON and note voltage.

^ Should have battery voltage.

If not, check for:

a. Open or short to ground in wiring between terminal #1 of power stage and terminal B15 of fuse relay panel.
b. Open circuit between power stage terminal #3 and engine ground connection on intake manifold.

Repair as necessary.

4. Connect LED test light between terminals #2 and #3 of power stage harness connector.

5. Crank engine and observe test light.

^ LED should flash while cranking (if connected with proper polarity).

If not, check for:

a. Open ground circuit between terminal #3 of power stage harness connector and engine ground connection on intake manifold.
b. Open or grounded circuit between ignition control unit terminal #16 and terminal #2 of power stage harness connector.
c. Faulty hall sensor.

Repair as necessary.

If hall sensor is OK, no wiring problems are found and LED still does not flash in step 5, then ignition control unit is faulty (no ignition signal from ignition control unit terminal 16).

If LED does flash and there is no spark, check ignition coil.

If ignition coil checks out OK and there is still no spark, replace power output stage.