Swift (DOHC)

To ensure power supply to power unit, disconnect primary wires connector at ignition coil. Turn ignition on. Using voltmeter, check voltage between coil positive terminal (Black/White wire) and ground. Battery voltage should exist. If not, check ignition fuse circuit. See Fig 2 .
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 1 .
Using ohmmeter, connect positive lead to terminal "G" and negative lead to terminal OC of power unit. See Fig 1 . 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. See POWER UNIT RESISTANCE table. Replace power unit if test results are not within specification.

Fig 1: Testing Ignition Coil Power Unit (Swift DOHC)

Courtesy of SUZUKI OF AMERICA CORP.

Fig 2: Testing Ignition Coil Power Supply (Swift DOHC)

Courtesy of SUZUKI OF AMERICA CORP.

POWER UNIT RESISTANCE

Application	Ohms
3-Volts At Terminal IB	Continuity
No Voltage At Terminal IB	No Continuity