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!
You did not test the coil!! You checked for 12 volts from the Harness! That does not tell you if the coil is bad and is not a “Check of the coil”.
That’s right! by testing the harness you are in turn checking the coil! Thanks for commenting!
This would only work if the code tells you which cylinder is misfiring. If there is a generic misfire code then how would this test tell me which coil pack is bad?
Hi Sam, thanks for commenting.
If you aren’t sure which coil is misfiring, try having your engine idle and unplugging one coil at a time. This should be able to isolate the problem with your Toyota Sienna ignition coil.
what if the coils are working but the car is not pulling
Hi Alex, can you be a little more specific when you say that your Sienna is not pulling?
Does the engine still accelerate normally? or does it rev faster?
How many miles do you have on the vehicle?
Is there any misfire?
What should the ground read
Ben, using a multimeter the ground should provide power when the red lead is connected to your battery. Good luck
Hi John,
Thanks for the guide. My question is where is the 12v coming from? is it from a fuse or relay? I’m wondering if you can provide the schematic just for this section. Because my I’m not getting any 12 volts from ignition plug
I really appreciate any information.
Hi Anthony, thanks for reading.
The 12v Sienna coil signal will be coming from your ECM relay, and should be with the harness that leads to your Toyota ignitor / cam angle sensor. Is there a break in this signal or are you not getting a power signal?
Hi I tested the front three coils I did not get any reading from the pin1 but I did get a ground reading of 12.11 on pin3 I am having trouble with the van not starting and I’m not getting any spark any suggestions would be awesome. I am thanking about the ECM is there a way to check that?
If an entire bank of coils failed, it is not the ECU. More than likely you have a ignition subharness issue, or the ignitor is messed up which is causing a whole side of your engine not to fire.
Hi I am having problems with not getting any spark with any ignition coil I checked the front three and I did not get any voltage on pin1, I did check pin3 and got a ground reading of 12, I am thank about the ECM is there a way to check that? Any suggestions would help thank you
Odd that the 4th hole in plug is referred to as pin 3.
I too would like to test the coil, not the wiring.
Many sites suggest we interchange coils and try again; when servicing the rear bank, so many parts are off the engine (such as throttle body) that engine can’t be started for testing.
Hi there David, if you are having misfire issues, changing coils is the fastest way to help diagnose it. Have you confirmed that your Sienna coil wiring is good?
I have two codes – one for #3 and one for #4. I will be replacing all plugs and coils since they appear to be original plugs (136,000 miles), 90919-A2002. Have readings on coils for cylinder #2, 4 and 6 as follows, terminals 1-4 – #2 (3.02 M ohms), #4 (156.6 k ohms), #6 (176.4 k ohms). #1,3 and 5 aren’t out yet. New coil is 90919-A2007. Readings ar 1-4 – 2.625 k ohms. Is that correct? Really big difference from terminal 1-4 on old coils to new coil.
Hi Pat, thanks for reading;
Okay, so to sum things up, you have :
Toyota Terminals 1-4 – #2 (3.02 M ohms)
#4 (156.6 k ohms)
#6 (176.4 k ohms)
#1,3 and 5 aren’t out yet.
New coil is 90919-A2007. Readings ar 1-4 – 2.625 k ohms.
I would test 1,3 and 5. Do you have a code presently? or is it just misfire you are trying to track down?