A 7-Step Guide to Replacing Your Toyota Ignition Coil
The Toyota ignition coil is responsible for leveling up the low-voltage power of your battery into high-voltage power, so that your vehicle's spark plugs can spur into life. Sometimes, the ignition coil malfunctions when the ignition module gets too hot. As a result, your vehicle runs very poorly until your engine suddenly jerks and dies from out of the blue. Since the ignition coil is such a crucial part of your vehicle, you shouldn't put off replacing it when it is damaged. Here is a step by step guide to help you do this task by yourself.
Required skill level: Intermediate
Needed tools and materials:
- Clean rags
- Electronic tester for the ignition module
- Insulated shoes
- Needle nose pliers
- Overhead lighting
- Protective goggles
- Screwdriver set
- Service manual
- Tray of bolts, nuts, and screws
Ensuring that the ignition coil is the root of the problem
Plug the electronic tester and the ignition module together and consult the Toyota service guide for specific instructions. You will find the ignition module near the distributor in the engine housing. If the reading projects low energy, then that means that the ignition coil is indeed the cause of the problem. Your Toyota ignition coil is not transmitting enough energy to the ignition module, so your car naturally cannot start.
Removing the old ignition coil
Before you remove the ignition coil, disconnect the battery cables first from the engine and the battery. After that, loosen the screws that hold all the electrical wiring to the ignition module. Keep the screws together so as not to mess them up. Take out the outer covering that houses the ignition module. Finally, yank out the part that looks like a huge cylinder with a lid and two electrical leads on top. That's the ignition coil.
Scrutinizing the old ignition coil
Double check the old ignition coil for signs of cracked housing, wobbly cap, damaged wire connections, and broken electrical leads. What you will find will lead you to the cause of the problem. Once you know the cause, try to prevent it in the future.
Checking the ignition module thoroughly
Just like you did with the ignition coils, examine the ignition module to track what caused the system to malfunction. Look for anything that is bent, cracked, broken, missing or twisted in all of the components of the ignition module. If a lot of things are not in place, prepare to replace the entire ignition module, and not just the ignition coil.
Assembling the new ignition coil
When you are fully certain that the problem only lies in the ignition coil and not in the ignition module, proceed in placing the new ignition coil into the ignition module. Put it exactly where the old one was, then reassemble the ignition module. Rejoin the leads and the wires together, then place the ignition module back to where it is supposed to be. Use the old bolts, nuts, and screws to secure it into place. Carefully check that all wires are connected, and that nothing is sticking out from the ignition module housing.
Reassembling the ignition module
Reconnect the battery cables with the ignition block and the battery. This will supply electrical power to the ignition module.
Start the engine and see if the new ignition coil works. You will know that the process is successful if the vehicle starts with no trouble.