1. Inspect the coil. If the plastic cover has chips, cracks, signs of overheating or oil leakage, the coil must be replaced.
2. Check the resistance of the primary winding of the coil. To do this, connect an ohmmeter to the low-voltage terminals of the coil. At 25°C, the resistance should be 0.4–0.5 ohms. If the resistance differs from the specified value, replace the coil.
3. Check the resistance of the secondary winding of the coil. To do this, connect an ohmmeter to the high-voltage terminal and the low-voltage terminal "B" of the coil. At 25°C, the resistance should be 4.5 - 5.5 kOhm. If the resistance differs from the specified, replace the coil.
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4. Check the insulation resistance to "ground". To do this, connect the ohmmeter to the coil body and to each of the terminals in turn. In all cases, the ohmmeter should show a resistance of at least 50 MOhm. If the resistance is less, replace the coil.