The best way to Test for a Weak Ignition Coil Single Ignition Coil1Disconnect the cable from the negative battery terminal.2Mark and disconnect the coil wires.3Check the coil's major resistance. Connect the leads of your ohmmeter towards the good and unfavorable terminals on the coil. Every car has its personal specifications for right principal resistance.
Consult your vehicle's service manual for this details.4Check the coil's secondary resistance. Connect one of your ohmmeter leads to a single on the terminals on the coil. Connect the other bring about the huge, center high-tension terminal. Consult your vehicle's service manual for the right resistance.5Replace the coil as needed Auto diagnostic tools.Multiple Ignition Coils6Remove the ignition coil rail or coil pack assembly.7Test every coil's primary resistance Auto diagnostic tool.
Touch the ohmmeter results in the principal terminals. Check with your vehicle's service manual for the right major resistance values.8Test every single coil's secondary resistance. Touch the ohmmeter leads to one of your principal terminals plus the high-tension secondary terminal. Your vehicle's service manual will have the appropriate resistance values.9Diagnose ignition coil issues by making use of a diagnostic scan tool, which is often carried out on newer autos. Connect the tool towards the vehicle's diagnostic port. Evaluate any codes against the codes within your vehicle's service manual.10Replace the coil rail or coil pack if necessary.
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