Engine cranks but does not start, no spark going to the plugs

If you have no spark, then we most likely have a crank sensor issue.

Here are a couple guides that will help with this:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

https://www.2carpros.com/articles/car-not-running-advanced

Basically, the crank sensor is what tells the PCM when to fire the coils so if we have injector pulse but no coils then we most likely have an issue with the crank sensor.

So, this means we need to make sure we have checked the injectors to see if they are in fact pulsing.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

I attached the wiring diagram below but let's start with this and go from there.

Thanks

Sorry. I thought I included that. Please see the attached for the details on the location.

Please let me know if you have other questions or what you find.

One more note, if you have not checked for codes then I would suggest starting with this as we could have something telling us what the issue is.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Thanks

Correct. Even if it is out of time, you should have spark when the crank passes by the tooth on the tone wheel.

So, if spark is the only thing not there, I suspect the crank sensor failed. Clearly that would be a coincidence, but the PCM needs the crank signal to determine when to fire the plugs.

Perfect. Yes. If the sensor is not the issue, then the PCM must have a driver circuit failure.

Can you make sure they know that there is no spark when they check the output voltage of the driver? They should be able to do that. A flash will most likely not fix this but if they return it with the latest software in it then that would be great as well.

Thanks for the update. Let us know how it turns out. Thanks

That works too. Thanks for the update. Please let us know the outcome.

Thanks

Okay. How sure are you that you are getting injector pulse? Clearly, we have made an assumption somewhere that led us down the wrong path.

Go to fuse M21 in the TIPM which is under the hood, and check for power on both sides of the fuse when you are in key on and cranking the engine. This is the ASD relay that feeds this fuse. The relay also feeds the injectors so if we have no injector pulse then the relay could be the issue.

Otherwise, we should have power on both sides of the fuse which means the coils are getting 12-volts, but the PCM is not commanding the high voltage spike. If that is the case, then there is another reason that the PCM is preventing spark.

However, if the PCM is not the issue and you put a crank sensor in it then I have to suspect that we have an issue with getting power to the coils through this fuse.

No. If spark is the only thing, then I would go to the coil and check for 12 volts first.

I assume you mean the wireless ignition node. The module that picks up the key signal.

If the engine cranks, then this is not the issue. The WIN is nothing more than the receiver that picks up the signal from the coded key to make sure it is a good key to start the engine. The starter would not turn if the WIN didn't send the signal.

I still think we have an issue with either getting power to the coils or the PCM is not seeing something it needs to fire the coils.

I would take that wiring diagram and just check for voltage at the coil.

Okay. It could be a harness issue, but did you check fuse M21 in the TIPM and make sure that this was not the issue?

Thanks for the update.

Okay. So, if you find the fuse below blown then that explains the no power. So, we need to replace it and check the operation.

It is a good idea to check the rest but clearly replacing that fuse should fix this issue as long as it doesn't blow again. If it does, then we have something that is drawing too much current causing them to blow.