Only a few things that will cause that. Bad coils, bad wiring harness between the coils and the PCM or a bad PCM. Your testing shows that it is not the coils. The next thing to do would be to check for the control signal from the PCM. If you look at the wiring there are only the two wires per coil. Power is a common feed to all four on the red wire. The other wire is the trigger wire to the PCM. An easy way to test is to use a NOID light, just plug it into the connector and see if it flashes when you crank the engine.
Another way is to use a simple test light and connect one side to battery possitive and touch the trigger wire for the coil and see if it flashes when the engine cranks.
I would start testing right at the PCM itself. Disconnect the battery and remove the connector that goes to the coils. Check it for corrosion and connection. Reinstall it.
Next check the ground connection to the PCM battery and block.
Now connect the battery back up, connect the test light to battery positive and go to the connection on the PCM where the coil wires connect. Either use a T-Pin or thin wire probe to back probe the wires or just use a needle to punch a hole through the insulation close to the connector. (Use liquid electrical tape to seal it when you are done) Have someone crank the engine and see if you get a flashing light on each wire. If you do there is a break in the wires to the coils, if you do not then the PCM is bad as it is the only ignition controller on that engine.
Monday, May 28th, 2018 AT 8:11 PM