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Volco ec240 cam position sensor

kevman6

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229973-ce25e7f05155c86cb70f5a8b405f04b9.jpg
 

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kevman6

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229978-ba2cb3d8996f57964b86983c27917bac.jpg
Also have this loose wire with no place to go. We also have the wrong valve cover on this it appears because it will not allow the EGR solenoid to mount
 

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kevman6

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Those came through great Thank You. Loose wire is blue wire 7.9V and white with maybe black tracer-ground
 

BigWrench55

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I am totally lost. When you check for continuity from the sensor connector back to the ecm. What pin location are they going to? Are they indeed going back to EA45 and 46? Or are they going to another pin location. I'm wit FWF on this. Sounds like the right engine but wrong application.
 

kevman6

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When I checked for continuity, battery off, key off, Top rectangular connector at ECU. Numbers go four in a row, 41-44, then 45-48, then 49-52 I checked continuity from all three connections at the harness end where cam sensor would connect, back to 45, then 46. There was no continuity to either wire
 

BigWrench55

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OK. Where the engine harness connects to the speed sensors. Is there a third wire in the engine harness at the sensor connector? And if so where does that wire pin at ecm? At this point I am not sure how your engine is running but I am confident that we can figure this out.
 

kevman6

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229985-bf1824cedc8af6eeeb3455e051eb6ba3.jpg
Yes these have 3 pin connectors at the cam sensor and the crank sensor
 

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BigWrench55

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FWF can probably help understand this conundrum better than I. He has been working on these a lot longer than I have. And he would know all of the idiosyncrasies of Volvo's over engineering better than I. I am wondering if you were to isolate that third wire that is seemingly tied to both sensors. That it would solve your problem.
 

kevman6

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Keep in mind that if the cam sensor is plugged in, it will not start, but if unplugged it starts and runs great. If I plug the cam sensor in once it is running it continues to run, but trips a second code 2703-08. Once shut off it will not start again until cam sensor is unplugged.
 

BigWrench55

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These engines are designed to run with just one crank/cam position sensor. My thinking is that you have a engine from another serial number break or machine altogether. And it just so happens that 4 of those wires are pinned the same as the original engine harness. And I am also thinking that these sensors will work with just two wires. And that when both are plugged in then that third wire is causing a issue. That is why I am curious to where that third wire winds up at the ecm. It may be getting voltage and causing issues with the sensors. Did you say that the cam position sensor was new? I can't remember.
And you are welcome this is what this forum is for. There is a ton of knowledge and experience here and some of the nicest people that are willing to share that knowledge and experience.
 

funwithfuel

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Let's get back to a starting point. ECU and sensors disconnected.
A)From cam sensor pin 3 to crank sensor pin 3 we want to see less than 1 ohm. Now from pin 3 of either sensor to pin 1 and pin 2 of each sensor. There must be infinite resistance. This is measuring the shielding ground against the 2 sensor circuits for cross bleed.
B) from pin 1 to pin 2 of each sensor connector of the harness. There should be no continuity. It must be an open circuit. Now measure from Connector EA pin 30 to pin 1 of SE2701. You're looking for less than 1 ohm. Measure from Connector EA pin 31 to pin 2 of SE2701. You should again have less than 1 ohm. Look at sch 18 posted in reply #40. Additionally look at passive measuring for 128 . This is measuring resistance values at the engine ecu connector of solenoids and sensors. The values you want to see are shown.
Write down your results, take pics of results, we'll get through this, you just might not have all your hair.
 
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funwithfuel

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Eng won't start plugged in cuz it's getting a crap signal. Take away the crap signal and the computer figures out if its coming up on 1 or 6. It bases everything off that reference vs the missing cam. It will run off one or the other but it must have 1. Cam signal is more refined since the wheel is moving at half crankshaft. Running off crank only, fuel isn't optimized to the level that Volvo wants. She'll still dig smooth and everything else she's asked to do.
 

BigWrench55

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I'm going to sit back from this to keep the confusion down to a minimum. If you guys need different technical material then let me know and I will get it to you.
 

funwithfuel

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It should be caused by incorrect engine timing. Disassemble the valve cover and check whether the camshaft signal generator is damaged, which has nothing to do with the sensor
This is a Deutz engine. The cam gear is in the flywheel housing. Not the larger bore Volvo engine. Welcome to the forums. Have you stopped by new member introductions yet?
 

kevman6

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cadillac, Mi
Using a second person up on top and me at ECM. I do have continuity at pin 45, and 46. Pulling the big square plug apart on the metal bracket where wires connect to ECM harness, ground wire connects to a blank plugged pin. No continuity from third wire to pin #5. Cam sensor is in the housing just above the starter. Sorry for the continuity mistake. You spent a lot of time because of that. Yes it is a new Cam sensor
 
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