Actually they do. You have to trace back to the ECM Relay pin 18 from the relay supplies power to the ECM/VB pin 119 & 120. From that same relay pin 17 is tapped with pin 18. Pin 17 supplies power to the Coils W/L wire while pin 18 powers CMP & CKP a R wire.udibl wrote: ↑Wed Aug 30, 2023 6:07 ami have another harness here in my office which i do not need, so i was wondering about the wires. i have open part of the hrnessfrom the CMP onwords and i have discovered that the CMP does not share same power and not even same ground with the coils. both IVT, CMP and CKP share same power and same ground.
still i will test the power while running the engine
2006 M45 running same with and without cam sensors
Re: 2006 M45 running same with and without cam sensors
Re: 2006 M45 running same with and without cam sensors
I have check power and ground and they are perfect. No issue there. I have tested the cam and ckp with my lab scope (have ordered 8ch USB scope, its on the way) and at least from what i understand from your advices, it looks ok. See attachments and let me know what you think. So all is ok but the problem stays. Iffff
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VStar650CL
- Technical Expert
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- Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S
Re: 2006 M45 running same with and without cam sensors
The timing looks fine but that garbage at the high phase of the crank doesn't, or the thick transition lines on many of the edges. That signal has a major noise problem. Do you have the wires to the CKP routed past anything electrically noisy?
Re: 2006 M45 running same with and without cam sensors
Actually the harness routes as original. Nothing special. I see that the signal wire is not shielded. Normal wire
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VStar650CL
- Technical Expert
- Posts: 8458
- Joined: Thu Nov 12, 2020 1:25 pm
- Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S
Re: 2006 M45 running same with and without cam sensors
Well, something is noising it out. Do you have any electrical components laying around, resistors and capacitors? The Hall outputs are open-collector (they can pull the circuit to ground but can't push it high). The high voltage comes from a pullup resistor inside the ECM, the sensor overpowers the pullup and grounds the wire when it detects metal. That arrangement makes the circuit very vulnerable to both broadcast RFI and common-mode noise (noise in the power rail) in the high signal phase, because the sensor output is "floating" and the only bias is coming from the ECM pullup. You might find that a small capacitor (say, 1 or 10 nanoFarad) across the signal and ground wires straightens it right out. If it's broadcast RFI coming from something outside the drivetrain, some household tinfoil around the harness grounded at one end may squelch it.
Re: 2006 M45 running same with and without cam sensors
Yes thats the story. I have electronic company here so i better take first, a shielded cable and bypass the original harness. Only for the signal wire. If it will solve any isdue, i will do it profffesionaly
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VStar650CL
- Technical Expert
- Posts: 8458
- Joined: Thu Nov 12, 2020 1:25 pm
- Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S
Re: 2006 M45 running same with and without cam sensors
I'd throw some tinfoil at it first as a test, just to see if it's RFI. If it isn't then you know you're looking at common-mode gremlins or weak bias in the ECM. On a resto like that, you might also try some old school condensers (as in points-and-condenser) at a few places on the main power rail to squelch noise coming out of the alternator or high-current stuff inside the car like the blower motor. If it's weak bias you might fix it by adding some extra pullup to the circuit.
Re: 2006 M45 running same with and without cam sensors
As i think about it more and more, im a fool... actually for the test, i have connected 3 meter of 0.75mm wire from the ckp signal, to the scope probe, and the second probe to the cmp, so the ckp wire was actually long and lying on the engine intake, since the scope probes are short....so eventualky i did not measure the signal from the ECM side, so it does not matter what kind of cable was there. Next time i will make the test only for the ckp, directly from the scope prob to the sensor connector
Re: 2006 M45 running same with and without cam sensors
Do the enclosed parameters make sense? Especially yhe injector pulsed with high rpm. Bank 2
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Re: 2006 M45 running same with and without cam sensors
Sorry I arrived quite late to the party, but did you solve this issue?
If not, I am curious what you have going on at the signal plate area. Did you use an M45 transmission as well, or is the engine adapted to something else? The engines can be a little finicky when it comes to the crank sensor picking up signal.
If not, I am curious what you have going on at the signal plate area. Did you use an M45 transmission as well, or is the engine adapted to something else? The engines can be a little finicky when it comes to the crank sensor picking up signal.
Re: 2006 M45 running same with and without cam sensors
hi. no it was not solved. yes i have used the M45 tranny but i think it cannot be the signal plate because the scope signal is ok, and it is synchronised correctly with the camshaft timing.
i have noticed that i also does not get speed signal in the OBD and TCC is not locked. i have checked the CAN and it seems to be ok
still the engine is running lean and idling is not stable with RPM moving up and down from 60 to 900 RPM
i have noticed that i also does not get speed signal in the OBD and TCC is not locked. i have checked the CAN and it seems to be ok
still the engine is running lean and idling is not stable with RPM moving up and down from 60 to 900 RPM
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