Thursday, 9 April 2015

How to test Ignition Coil

Ignition Coil Test

Testing Car Ignition Coil

Step by step guide on how to test an automotive engine's ignition coil and trigger, this article pertains to most ignition coil systems.
Difficulty Scale: 4 of 10
Begin with the car on level ground, in park with the emergency brake on.
Step 1 - Identify the type of ignition system to be tested, most cars, use a coil over plug (COP) type of system, there are several variations but all work on the same principal.

Coil Over Plug Ignition System
Step 2 - When checking for a misfire while the engine is still running, the fuel pump must be disabled to avoid accidental ignition discharge. Using the owners manual identify the fuse location.

Fuel Pump Fuse

Step 3
 - Once the fuse is located use needle nose pliers or a fuse removal tool to remove the fuel pump fuse from the power distribution center (PDC.)

Removing Fuel Pump Fuse
Step 4 - Remove the safety from the coil electrical connector (red.) Some cars are not equipped with this feature.

Remove Ignition Coil Safety
Step 5 - After the safety has been removed, depress the electrical connector tab to remove the connector from the coil assembly.

Remove Coil Electrical Connector
Step 6 - Once the connector has been removed, located both terminals to be used for testing.

Coil Electrical Connector Terminals

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