IGNITION COIL INSPECTION[AJ (3.0L Duratec)]

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Primary Coil Resistance

1.  Disconnect the ignition coil connector.

2.  Using a tester, measure the resistance between the ignition coil terminals A—B.

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•  If not within the specification, replace the ignition coil.
Ignition coil primary coil resistance (reference) [25 °C {77 °F}]
0.45—1.15 ohms


Secondary Coil Resistance

1.  Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

2.  Using a tester, measure the resistance between the ignition coil terminal A and ignition coil boot socket.

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•  If not within the specification, replace the ignition coil.
Ignition coil secondary coil resistance (reference) [25 °C {77 °F}]
5.0—6.0 kilohms


Insulation Resistance of Case

1.  Disconnect the ignition coil connector.

2.  Using a tester, measure the resistance between the ignition coil terminal A and the ignition coil case.

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•  If not as specified, replace the ignition coil.
Ignition coil insulation resistance of case (reference) [25 °C {77 °F}]
10 Megohms