How to Troubleshoot a Coil in a 2000 Ford F-150 Triton


The Ford F-150 was introduced in 1975 and eventually replaced the Ford F-100 completely. The 2000 Ford F-150 was equipped with a 4.2-liter V-6 engine in the base truck, although a 4.6-liter V-8 and 5.4-liter Triton V-8 were optional. The ignition coil distributes the spark to the spark plugs on the engine and is controlled by the ignition control module. Testing the ignition coil is somewhat easy. The Triton V-8 has separate coils over each cylinder, whereas the other V-6 and V-8 engines use coil packs that provide spark to multiple coils.

Things You'll Need

  • Multimeter
  • masking tape
  • black marker

Checking for Power Between the Ignition Control Module and the Coil

  • Enter the driver's side of the F-150. Turn the ignition key to the "on" position without starting the truck's engine. Open the hood on the truck. Set your multimeter to the volts setting.

  • Remove one of the electrical connectors from an ignition coil by hand. Turn the connector end to face you. Insert the red and black probes from your mutimeter into each one of the electrical connector plug holes. These holes are the start/run plug hole, and the CD plug hole. Test the voltage between the ignition control module, or ICM, and the coil. The reading on your multimeter should be no less than 1-volt and no more than 10-volts.

  • Repeat Step 2 to complete the test on all eight ICM to ignition coil wire connectors. If readings for one or more connectors are not within the provided specifications, then the entire ICM to coil wiring harness or the ICM is bad.

Checking the Ignition Coil Resistance

  • Open the hood of the F-150. Disconnect the negative battery cable with a ratchet and socket. Set your multimeter to the ohms setting.

  • Remove one of the ignition coil electrical connectors from the coil. Insert the red probe from one coil onto one of the electrical prongs on the coil. Insert the black probe onto the second electrical prong. The measurement on the multimeter should be between 0.3 and 1.0 ohms.

  • Repeat Step 2 of this section to complete the resistance testing on all eight coils. Replace coils as needed if they do not fall within the provided specifications for resistance. Install the electrical connector when you are done testing or replacing any of the coils.

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