Toyota Sienna Ignition coils are coil on plug (COP) style units that directly mount to the top of your spark plug. While it’s not common for these coils to fail, this can happen over time resulting in a check engine light being triggered on your Sienna dash. The check engine trouble code can point to misfire or inconsistent spark issues that can be caused from your one faulty Toyota Sienna Ignition Coil.
Today we’ll be showing you how to test the coil in your Toyota Sienna with a 3.5 liter V6. Our test vehicle today is a 2012 Toyota Sienna Sport with the 2GR-FE engine in it.
Symptoms of a bad Toyota Sienna Ignition Coil
- Rough idle
- OBDII misfire code
- Poor gas mileage
If you have any of these symptoms, and you think that the ignition coil could be the culprit, you’re gonna need a multimeter. Want to learn how to use a multimeter to test your ignition coil circuit?
The Toyota part number for this ignition coil is 90919-A2007, and it can also be found under the Toyota part number interchange of 91919-02251. If neither of these part numbers are in stock at your local Toyota dealer, try these part numbers that will also fit :
- 90919-02255
- 90919-A2002
- 90919-A2004
To get started using our How To guide on the Toyota Sienna ignition coil, open your hood to your 3.5 liter Toyota.
Grab the front lower lip of the engine cover and lift to remove the 2GR-FE panel. You will be lifting up gently and then pulling towards you to uncover your V6 engine.
When you have the engine uncovered, you must locate the cylinder or ignition coil that is having a problem. Often times your OBDII trouble code will inform you which cylinder that’s misbehaving. If you have a generic Toyota misfire code, this could complicate matters as you’ll have to test the circuits one by one until you find the bad coil.
Our problem cylinder is thankfully located up front where it’s much more easier to reach the ignition coil harness and coil itself. Unplug the ignition coil and then get your multimeter ready to test the 3.5 liter Toyota engine harness.
Once you have the ignition harness unplugged, use the diagram below to see what terminals we’ll be testing.
Looking at the Toyota Sienna connector from the front of the plug, you will be testing the red and black PIN 1 using your multimeter. Make sure when you are testing this Toyota Sienna harness with your multimeter, you do not force the probe into the plastic housing. Damage could occur which would only complicate your ignition coil issues, not solve them.
Test the Toyota Sienna engine harness for power
The black probe of your multimeter must be grounded, preferably on your battery. Check PIN 1 and the value you are looking for is 12 volts at this wire. PIN 1 is the one shown above outlined red with a black circle.
The next wire you will be testing is the negative terminal of the ignition coil, this is PIN 3, or the PIN shown above that has a white ring around a gray circle.
There should be a ground signal here at this wire, and if you have both power and ground chances are your ignition coil is bad and must be replaced. Remove the bolt and then pull up on the Toyota Sienna ignition coil to replace the bad unit. Once you have the new part installed and properly tightened, use a scan tool to remove the check engine trouble code on your dashboard.
Have any questions about our guide on how to test your Toyota Sienna Ignition Coil? Leave us a comment below and let us know!