Ignition coil resistance measurement

Reliable measurement is possible if the engine control unit is working properly. Ignition systems on 96 Series models can be tested with a multimeter in resistance test mode.



SEQUENCE OF WORK

1. Turn off the ignition.

2. Disconnect the high voltage wire from the ignition unit.

Primary resistance measurement

3. Disconnect the universal electrical connector.



Pic. 9.9. Location of pins in the universal electrical connector

4. Connect an ohmmeter in series to pins 1 and 2, 3 and 2 (pic. 9.9).

5. Resistance should be in the range of 0.4-0.6 ohms. Otherwise, replace the ignition unit.

Secondary resistance is not measured

In older Fiesta models, you can still measure the resistance of the primary and secondary windings of the ignition coil. If the results obtained are below the required values or the measuring device shows infinity, the ignition coil must be replaced. The measurement must be carried out at room temperature (20°C). Before measuring, turn off the ignition and remove or disconnect all wires from the ignition coil. Resistance is measured between contacts «15» / «+» And «1» / «–» «masses», as well as contacts «1» / «–» And «4». Turn-to-turn fault cannot be diagnosed by measurement. If large discrepancies are found during measurement, replace the ignition coil.