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Camshaft sensor (CAS) voltage test results.. need help here?

Car is an Eagle Talon 96 2G ESI. I've been having a cutoff problem and trying to narrow it down.

Symptoms: Car dies while driving or idling within a half hour, sometimes 10 minutes. Can start up usually after 5 minutes or so but then repeats the cutting off.

Results: When car dies and immediately will not start back up I test the power going to the coils and only 0.07v. When the power shows 12v I plug back in coil pack and starts. So I know that the ASD (MFI) relay is either cutting off and bad or something is telling the PCM to not send power to it. In this mode the fuel pump does not prime either. I'm pretty sure the PCM send the command to the ASD (MFI) relay which then allows power to pump, coil pack and injectors.

I tested volts on the cable that goes to the camshaft position sensor because I'm suspicious of it but the results don't make sense but I am a newby with a multimeter :s

The middle wire appears to be black and ground and doing an ohms test it appears to read either 001 or 002 set on range 20ohms on meter. Most things seem to say 2 ohms or less is good.

I test for voltage on the other two wires being blue with red stripe and one is yellow. Both show 0.68v with the key turned to the ON position. My understanding is that one should be 12v and the other is the signal which should be anywhere from 1.5v to 5v. I'm not sure if that is correct but the Haynes manual says and also read on forums.

One important note is that I can tell if the car will start with key in the ON position because it will show the check engine light along with the red indicator lights when you turn key to ON. Also the radiator reservoir symbol. If I pull the plug on the camshaft sensor and turn the key to ON it shows only the red indicator lights and will not start but the strange thing is if I plug the camshaft back up and turn key to ON after doing that it will not start for awhile. Like something has alreadt told the PCM something and now on a timer before allows to start. weird.

My personal opinion of this is the test doesn't mean much unplugged because the second the PCM realizes the camshaft sensor is not connected or functioning it appears it cuts power to it as well as the coil, pump, injectors, etc. So the test of voltage may mean nothing and makes sense I guess.

I think if I was to remove the insulation on the power wire and signal wire that while it's connected I would get actual voltages. Because the PCM shuts power to everything immediately if sensor is not communicating or senses it. And just the same, the car will not start if I have CAS unplugged.

So no reason to bother to test voltage while cranking.

What do you make of all of this??????????????????????

Thanks in advance :)

Update:

It's a 95 but wouldn't make a difference

Update 2:

I've read about the ECU/PCM's capacitors doing so but mine is filled with the goo stuff so water proof I guess. Capacitor could go bad but it wouldn't be able to leak.

Actually I went ahead and put a new CAS on it, cleaned the throttle body. Got a throttle body sensor code at Advance earlier.

I just drove the hell out of the car and never cut off once but it could still start doing again.

It seems like the original CAS connector was shorting out because before I rewired the new connector for CAS I tested and then the power wire was giving 9v which I think is correct. The manual says 12v but most things I've read online says 9v.

2 Answers

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  • 1 decade ago
    Favorite Answer

    The Eagle Talon and Mitsubishi Eclipse both have the same common problem that happens so often you need to start by checking it out. The capacitors in the ECU leak and burn the circuit boards. Pull the ECU, remove the 2 cover plates and look at both sides of the circuit board. You will probably find black "burn" marks which are caused by the leaking capacitors. Time for a new ECU. I'm surprised you have not heard about this already since you've been on the internet looking for clues.

    Source(s): Mitsubishi Master Tech
  • 5 years ago

    surely i am going to furnish you with a effectual clue. If in any respect accessible eliminate the crankshaft position sensor besides because the camshaft position sensor. make positive the aiming eyes are sparkling. we've considered really some dirty ones lately from vehicles which have not had the oil replaced usually or they use crappy motor oil. Sorry about no longer answering your question. to finish that, we favor the year, make, type and engine that's contained in the motorized vehicle.

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