Distributor ignition systems
Examination
1. Turn the ignition key to the OFF position.
2. If the ignition coil is located in the distributor, remove the distributor from the engine (see paragraph 9).
3. If the coil is located outside the distributor, in the engine compartment, disconnect the electrical connector of its primary winding.
4. Measure the resistance of the primary winding of the coil with an ohmmeter and compare the obtained result with Technical data (figure 7.4).
5. Measure the resistance of the secondary winding between the high voltage terminal of the coil and the positive terminal of the primary winding. Compare the obtained value with Technical data (figure 7.5).
6. The measured resistance values may differ slightly from those indicated in Technical data depending on the coil temperature. IN Technical data resistance values are given for a temperature of 21°C.
7. If the resistance of at least one of the windings differs significantly from the required value, replace the coil.
Replacement
8. Disconnect the negative cable from the battery.
Warning. If your vehicle's audio system is equipped with anti-theft protection, make sure it is enabled before disconnecting the battery. that you know the unlock code.
9. If the ignition coil is located inside the distributor, then, according to the manufacturer, the coil can only be replaced together with the distributor as a single unit. However, before you decide on such a replacement, still look for a coil for sale separately from the distributor - perhaps you will be lucky.
10. If the coil is located separately from the distributor, disconnect the connectors from it, unscrew the mounting nuts and remove the coil.
11. Installation is carried out in reverse order.
Distributorless ignition systems
Examination
12. Disconnect the electrical connector from the coil pack (figure 7.12). Measure the resistance between the ground (-) terminal and each of the positive terminals of the connector. If the measured values are outside the limits specified in Technical data, replace the coil unit.
13. Label the high voltage wires to avoid confusion during reinstallation and disconnect them from the coil pack. Measure the resistance between each pair of terminals (figure 7.13). Compare the measurement results with the values given in Technical data. If any of the measured values is outside the permissible limits, replace the coil pack.
Replacement
14. Mark the high-voltage wires and their terminals on the coil block to avoid confusion during reinstallation. Disconnect the connector wires from the old block.
15. Unscrew the coil unit mounting bolts and remove it from the engine (figure 7.15).
16. Installation is carried out in reverse order.