Sidekick & Swift DOHC

To ensure power supply to power unit, disconnect primary wires connector at ignition coil. Turn ignition on. Using voltmeter, check for battery voltage between coil positive terminal (Black/White wire) and ground. See Fig 1 . If battery voltage does not exist, check ignition fuse circuit.
To check power unit resistance, turn ignition off. Remove power unit from under ignition coil. Tape together two 1.5-volt batteries in series to create a 3-volt power source. Install leads to 3-volt power source. Apply negative lead to "G" terminal and positive lead to terminal IB of power unit. See Fig 2 .
Using ohmmeter, connect positive lead to terminal "G" and negative lead to terminal OC of power unit. See Fig 2 . Check for continuity with 3-volt power source applied to terminal IB. Check for no continuity with 3-volt power source disconnected from terminal IB. Replace power unit if test results are not within specification.

Fig 1: Testing Ignition Coil Power Supply (Typical)

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Fig 2: Testing Ignition Coil Power Unit (Sidekick & Swift DOHC)

Courtesy of SUZUKI OF AMERICA CORP.