NOTE: Before starting test, ensure battery is at or near full charge.

Disconnect 2-prong connector at leading side ignitor. Connect a voltmeter between "BY" wire terminals. Turn ignition switch to "ON" position. Ensure voltage is about 12 volts. See Fig 1.

Fig 1: Leading Side Ignitor Voltmeter Connections
Turn ignition switch to "OFF" position. Disconnect voltmeter and negative battery cable. Connect Ignitor Checker (49 F018 002) between 2-prong connectors.
CAUTION: Do not misconnect ohmmeter leads. Ensure "+" lead goes to ground and "-" lead goes to "B" wire. Be sure negative battery cable is disconnected before removing "B" wire from coil with ignitor, or system will be damaged.
Disconnect "B" wire from coil with ignitor. Reconnect negative battery cable. Connect an ohmmeter between "B" wire and ground. Turn ignition switch to "ON" position. Push up "SW2" switch on ignitor checker while checking ohmmeter. Pointer needle on ohmmeter should jump to about the 1/3 scale, then drop. See Fig 2. Replace ignitor as necessary.

Fig 2: Ignitor Checker Connection Location

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

Leading Side IGNITOR