Mazda MX-5 NA silhouetteMX-5 NA

IGNITION SYSTEM — IGNITION COIL

G-21prose procedure

IGNITION COIL

Inspection

Ignition coil inspection

  1. 1
    Disconnect the ignition coil connector.
  2. 2
    Check for voltage at the positive (+) terminal of the ignition coil connector with the ignition switch in the ON position. Voltage: Approx. 12V
    Engine bay photo: voltmeter probes connected to the positive (+) terminal of the ignition coil connector to verify approx. 12V with ignition switch ON.
    05U0GX-047
  3. 3
    If there is no voltage check the main fuse, ignition switch, and wire harness.

Primary coil winding

Measure resistance of the primary coil winding of each coil with an ohmmeter. If not within specification, replace the coil.
Primary coil winding resistanceat 20°C [68°F]
0.78—0.94Ω

Secondary coil winding

Measure resistance of the secondary coil winding of each coil with an ohmmeter. If not within specification, replace the coil.
Secondary coil winding resistanceat 20°C [68°F]
11.2—15.2

Installation of Case

Use a 500V megger tester to measure the insulation resistance between the primary terminal and the coil case.
Resistance
10MΩ min.

Replacement

Ignition coil replacement

  1. 1
    Disconnect the high tension-leads and ignition coil connector.
  2. 2
    Remove the installation bolts and the ignition coil.
    Engine top view showing the ignition coil installation bolts and connector being removed during coil replacement.
    05U0GX-051
  3. 3
    Install in the reverse order of removal. Tightening torque: 19—25 N·m (1.9—2.6 m-kg, 14—19 ft-lb)
Tightening torque (ignition coil)
19 - 25N·m

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