No spark

Got a 2007 tacoma 2.7... I'm getting spark to cylinder 3 and 4 but no spark going to coil 1 and 2.. swap the coils and still the same outcome no spark in cylinder 1 and 2. What could this be? Thanks for your help and input

 

Watching question

 

Does the engine run?
Have you checked for power (With a test light not a meter) (Pin 1 Black/Red) and ground (Pin 4 White/Black) at the coils?
If those are good you are missing control (Toyota uses a 4v signal to fire the coils), without a scope to see it all you can do is ohm out the control wires.

 

Tested and still no coil control going to coil 1 and 2 but got coil control going to coil 3 and 4. Any ideas or lead way? Does the 2 grounds on the back of the motor have anything to do with this? I have installed a new crank and cam position sensor and nothing has changed for me. Thanks for your help and time

 

How are you testing for coil control?
Have you tested it at the ECM?

 

Yes testing it right at the ecm plug wires with ecm plugged in.. only getting control to the 2 coils and nothing to the other 2. Got an new ecu from flagship and told them the situation and to said send it back to test it. But the thing that consurns me is that with the old ecu plugged in its doing the same thing? Cut apart whole wire harness to see if wire was cut or frayed and can't find anything? Should I remove those 2 grounds on the back of the motor and clean them up and see if that's does anything? Have no idea what to do so any ideas and your help is well appreciated.. thanks again

 

What are you using to test coil control?
Have you confirmed that you have a good ground to both coils?

 

Really need a scope to see the pcm grounding/controlling the coils

 

Check for rodent damage

 

I do have power and ground going to coil 1 and 2 as well as 3 and 4... how do I test to see if I'm getting coil control to those coils/ cylinder 1 and 2? Thanks for your help

 

Lab scope

 

There is no other way to test it at the ecu?

 

I'm getting spark to cylinder 3 and 4 but no spark at cylinder 1 and 2. Got power and ground? How do I test it to see if I am or not getting control to those cylinders

 

Did this show up after doing the parts change out? If this happened after installing or changing something out back track and see if anything was damaged or left up plugged.

 

This is crank position sensor.. should this wire be like this? Is this correct?

 

Looks like rodents. Are the wires broken and touching?

 

That one wire going to brown wire on connector isn't incased in insulation

 

Looks like green is open and touching the other open wire.

 

It's not supposed to be, it's the shield wire for the crank sensor signal wires and it connected to sensor ground.
The other wires should be fully insulated though.

 

With the above diagram you should be able to ohm out the wires between the pcm and sensor. If the wiring is good you may have a bad pcm