Ignition Coil And Electronic Control Unit Check

1. Turn the ignition switch to the "ON" position. Connect positive voltmeter lead to ignition coil positive terminal. Connect remaining lead to ignition coil negative terminal. See Fig 1.
2. Quickly move a magnet back and forth over impulse sender coil. If voltmeter needle moves, but engine would not start, replace ignition coil. If needle does not move, replace ignition control unit.

NOTE: This is only necessary when vehicle will not start, and other tests have been performed.

Fig 1: Voltmeter Hookup for Checking Ignition Coil & Electronic Control Unit Attach leads to primary coil terminals.