What is the coil on plug on a Toyota Corolla?
A 2008 Toyota Corolla came to me with a check engine light and misfire. I scanned the vehicle for codes and found a P0354: Ignition coil “D” primary/secondary circuit. Ignition coil D is cylinder 4. Ignition coils are a common failure for this vehicle, so I swapped the coils with no change. Time to do some more involved testing.
Do you need a DSO for Toyota coil on plug?
Many manufacturers do not use DSO diagnostics in their dealerships, however Toyota recommends using a scope on these systems. Service information will actually include known good waveforms and thorough information about the system. Here is a known good waveform of 1ZZ-FE.
Where is the igniter on a Toyota coil on plug?
When testing a coil-on-plug (COP) ignition system, one of the first steps is to understand the system operation. The location of the ignition module that actually drives ignition primary coil is located in each COP. Toyota calls this module the igniter. The PCM still decides when to fire the ignition coil based on various inputs.
What causes a coil on a spark plug to fail?
Coils fail in two ways. Coils can fail where they do not fire the spark plug, which will obviously cause an issue. There are some cases however where the ignition coil is firing fine, but the coil is not capable of pulling the IGF signal to ground. This code can also be caused by an open in the IGF circuit, and very rarely a PCM issue.
Where are the spark plugs in a Toyota?
Spark plugs are a serviceable, yet extremely important, part of your Toyota’s engine. They sit inside the cylinder head where they create the spark that ignites fuel — the combustion that enables your engine to run. Spark plugs that have outlived their time will cause misfires in your engine — robbing it of efficiency and performance.
When testing a coil-on-plug (COP) ignition system, one of the first steps is to understand the system operation. The location of the ignition module that actually drives ignition primary coil is located in each COP. Toyota calls this module the igniter. The PCM still decides when to fire the ignition coil based on various inputs.
A 2008 Toyota Corolla came to me with a check engine light and misfire. I scanned the vehicle for codes and found a P0354: Ignition coil “D” primary/secondary circuit. Ignition coil D is cylinder 4. Ignition coils are a common failure for this vehicle, so I swapped the coils with no change. Time to do some more involved testing.
Coils fail in two ways. Coils can fail where they do not fire the spark plug, which will obviously cause an issue. There are some cases however where the ignition coil is firing fine, but the coil is not capable of pulling the IGF signal to ground. This code can also be caused by an open in the IGF circuit, and very rarely a PCM issue.