2015 4cyl - Will Crank, No Fuel, No OBD, Stuck in park

So, you have no power to EFI No.2 fuse (#7)?
This fuse should have power with Key On.
It’s powered by the EFI Relay . The EFI Relay also powers the Fuel Pump.

 

Negative on #7 power with key off or key on. I even pulled it to double check the actual fuse.

 

There’s a problem

We are getting somewhere now.
Next thing to do is pull the EFI relay, and see what pins have power.
Pins #1 and #5 should have power with key ON/Run.

See my fuse box diagram above for Pin # of relay.

 

Please note, I replaced this image with red lines on the hot legs since I first posted this image.

On that relay R10, there are two legs that have power. According to the chart above, they would be 1& 3 or 5&2?? A line from one leg to the the would be a diagonal (like a 45-degrees across the fuse, if that makes any sense. not right across from each other. Relay R6 the. C/OPN relay has power to only one leg with the key on. I hope the picture helps!

As well, I tested the horn relay and both the EFI & C/OPN "blew the horn" when I swapped them into position R15. SO both of those relays seemed "to work" as horn relays.
Thanks

 

You need to use this diagram.
R10 on your diagram is the mag clutch relay for the AC. You need power to pins 1 and 5 of the EFI relay. Key on.

 

I am hoping to get to the correct relays TnSHooter. This is a relay chart that I could interpret. I hope it does not frustrate you : )) If I need to adjust something, I will. I'm just not reading the relay legend on your diagram as well.
KEY ON - HOT LEGS MARKED IN RED
Thank you.

 

I had similar problem with the immobiler. Not sure if this was suggested or not but the easiest way to identify if its the immobiler is put the key in, turn it on. If the "red truck light" near the hazard/clock still flashes your truck will NEVER start. Stop chasing ghosts until you confirm that otherwise it can get expensive (ask me how I know ). I had a faulty immobilizer that only acted up over 90 degrees in the summer.

 

My key does not have a chip. Thanks though, as well.

 

I thought they were standard no? Mine is a 2011 and looks like this. Took a few minutes to time the light right for the picture but that light flashes every 2.89 seconds. Put the key in and the light stays off (unless its 90+ degrees out and the truck was in the sun. Then I have to let the interior cool or blow into the ignition a few times). If you put the key in and it still flashes that is a problem.

Not trying to argue (you know your truck) and I'll drop it but people have spent a lot of money chasing ghosts with a bad immobilizer because it still cranks over but no spark.

 

In the US only V6 trucks have an immobilizer, 4cyl trucks do not.
Good suggestion though.

 

Promise, no chip! I'm not sure why, but a few of the 2015's did not have them. I appreciate the heads up though.
Here some interesting reading I found on this forum. Thanks again.
https://www.tacomaworld.com/threads/do-i-actually-have-a-chip-in-my-key.741793/

 

Good info. I didn't know it was only un the V6 trucks. My bad. Hope you track it down soon! Let us know once you do. Good luck!

 

You need power to 1 and 5 of this relay with key on. (EFI Relay #13)
I’m fairly certain the 2nd Gen trucks don’t need a crank signal before the ECM command power to the #1 pin.
@Dm93 might know for sure?
I would try checking Pin #1 for power while cranking as well.

The ECM sends power to Pin #1. This energizes the Relay.
The relay the makes connection between #5 and #3.

If you have no Power to pin #1, then you either have 1 of the following.

1. Bad ECM - This is HIGHLY UNLIKELY
2. The ECM isn’t seeing the correct signals to to send power to the EFI relay.
3. Bad wiring between the ECM and Relay.

At this point I’m going with 2.

Im going to have t9 go back and reread all you prior post and see if I missed any clues.

 

TnShooter, I appreciate you! I am going to take the door panels off to see about a crackling speaker that had a short. Don't know if they may be connected in any way. I also took apart my shifter recently and cleaned everything and made sure it rests nicely in the Park position as well as Neutral position. Used electrical cleaner on the harnesses. I've taken the dash plastic off to check for any obvious wire to ground.

Interesting is that the truck recognizes the gear selector because I can remove my key out of the ignition, ONLY in the Park position.

When my truck won't shift out of Park and I could hear it dry cranking (even before I pulled a fuel line to find no fuel pressure), something told me the truck / computer, is not recognizing the key being on, the brake pedal depressed and the truck in Park, all necessary to tell the computer to send a signal to the fuel pump for fuel. So I did not panic and instantly replace the fuel pump.I replaced the ignition switch, but have not tested the back wires of the new switch. Should I and if so which wires? I also replaced the plunger type harness at the bottom of the brake pedal as it was not an expensive part when I first tossed parts at it. TnShooter, thanks so much.

 

The EFI fuse and relay look to to supply the Main Power for the ECM.
We need figure out why the EFI relay isn’t being commanded on.

 

Perfect!

 

Check your PM’s

 

The PCM should turn on the EFI Relay the moment it powers up, it will not turn on the C/OPN Relay until it sees a Start signal from the ignition switch and/or an RPM signal from the engine.

I haven't read the whole thread but is your check engine light on when you turn the key on?

 

Yes it is Dm93. Thanks for checking in on this.

 

We have more than one issue here.
I did a little digging, and found that the control wire for the EFI Relay should in fact read 12v with key On.

But we need to figure out why you have no communication with a scan tool.
That I’ll have to research a bit more. I would think you are getting power to the scanner, other wise it would come on? Unless you scanner has its own battery?

I suspect there is a problem with the ECM communication?
That doesn’t mean the ECM is bad, but it’s looking like you’re going to need to check the ECM for powers and grounds.