Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose).
I believe I can help on this concern if you still want or need help after this excessive wait time. This is not an answer to your question.
Lets start with the blue/black wire to the coils and ignition transistor. Is this wire powered with the key on?
Is the black wire to the transistor a good ground?
Do you have a scan tool to see if the computer is getting a signal from the crank sensor?
Will your OBD tool show you what sensor inputs to the computer are reading. The tool accesses the computer and then you watch the crank sensor. Then crank the engine to see if the computer is getting this signal.
So far this is going to be a CKP sensor or computer or ignition transistor failure for no spark.
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There are thousands of available scan tools. You would just need to research them to find one that fits your needs and see if it can monitor things called PCM/ECM inputs or freeze frame data. If it says those things then it will work.
You can monitor across both wires at the CKP while cranking looking for a AC voltage. This will tell you if the sensor is working but it will not tell you if the sensor is reading right, this test can only confirm, yes its doing something.
They can get expensive. You make a decision based on how much information you want and how often you are going to use it. I have a dealer tool and an aftermarket tool for all makes and models. Mine were around 2000$ each.
This tool would work.
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A scope is needed to check the ECM to ICM signal. The signal is pulsing power. You can mimic this by connecting a test light to battery positive and tap the test light point to the ICM signal input wires and see if spark is made by the coils. If a wire diagram would help, let me know.
Here is the diagram.
Hello again Chris here,
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Thanks for the update. Keep in touch on the results.
We are stuck at this point till we can see if the computer is getting a crank sensor signal.
It should show a speed reading in rpms.
It should produce a signal within a 10th of a second of the starter engaging and spinning the engine.
That is good crank sensor reading. So that leaves the ECM or ICM to blame for no spark. If there is no pulsing power from the ECM to the ICM then the ECM is to blame.
A scope is needed to check the ECM to ICM signal. The signal is pulsing power. You can mimic this by connecting a test light to battery positive and tap the test light point to the ICM signal input wires and see if spark is made by the coils. If the mimic makes spark then the ICM is good.
You do this with the key on and with a spark plug removed and grounded to see if the plug sparks as you tap the test light to the signal wires to the ICM.
Here are the 3 signal wires.
Yes those colors are correct. Each signal wire signals the transistor and the transistor sends a signal to a coil and that coil fires 2 plugs.
No spark bad transistor
Get spark bad ECM
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