Turn ignition off. Disconnect Ignition Control Module (ICM) connector, install Test Harness (49 F018 003) and Ignitor Checker (49 F018 002). See Fig 1 . Connect ignitor checker to large lead of test harness and to battery. Turn ignition on. Ignitor checker switch SW1 may be in either position.
CAUTION: Ensure voltmeter is installed with (+) lead to ground and (-) lead to single-pin wire of test harness. DO NOT reverse leads, or damage may result.
Using analog voltmeter, connect (+) lead to ground and (-) lead to Black (leading side) test wire of test harness.
Ensure voltmeter displays battery voltage. Push up ignitor checker switch SW2 and verify voltmeter needle fluctuates. Release switch SW2. If voltmeter does not operate as specified, replace ICM.
Repeat steps 2) and 3) for Brown (front rotor trailing side) test wire and Gray (rear rotor trailing side) test wire. If ICM does not cause voltmeter needle to respond, replace ICM.

Fig 1: Checking Ignition Control Module

Courtesy of MAZDA MOTORS 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

Ignition Control Module