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 1 .
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 "IB" terminal 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 "IB" terminal. Check for NO continuity with 3-volt power source disconnected from "IB" terminal. See SWIFT POWER UNIT TEST table. Replace power unit if test results are not within specification.

SWIFT POWER UNIT TEST

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

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

Courtesy of SUZUKI OF AMERICA CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Swift DOHC