Is crank sensor wiring different on Gen4 and Gen5 blocks ?

[Lakegoat]

I am using a Gen 5, L83 long block with(port injection) with an E38 (late) computer. Cranking, I don't have any rpm reading. It fires up and dies immediately. I see cam counts. I guess it is getting fuel and spark since it fires up. Vats and starter checks are disabled. Here is a short scan---and the tune. I was wondering if the sensors were different or if it matters if the wires are switched around? Thanks for any info.

[Lakegoat]

I pulled the starter and unplugged the crank sensor. I have the two outside wires reading 5.00 volts and the middle wire showing 0.

I signed up for Alldata for a month. The 2012 wiring and the 2015 wiring on the crank sensor have the two outside pins reversed. I have the ICT conversion pigtail so that is built into their plugs. I pulled the sensor and checked the sensor itself and it shows to be BAD!! I hope that's it---

[Lakegoat]

The old sensor had an ohms reading of 380 (on the 2000k selection). The new sensor was about 800. I installed the new sensor and still no rpm reading when cranking. I have all the spark plugs pulled. Good oil pressure though . I need to poll for parameters---I guess. Head scratcher

[kingtal0n]

I've come across a few cars where the owner bought the wrong sensors or had the wrong wiring its very easy to mix them up with all the pigtails and harness flops and years and misleading colors.

Some sensors are 12v some are 5v. Some have harnesses with internal wire flips. I collected these maybe this will help













Despite these informations I have still had a slew of issues with aftermarket brand new out of the box sensors. Some of the gray ones turned out to be 'black' voltage and some of them just seem to work poorly. Since then I have resorted to using and collecting only OEM sensors from junkyard engines from which I Can verify the year and exact wiring and voltage. Either the companies producing the aftermarket sensors are making them poorly or perhaps customers are buying and returning bad or wrong sensors into the boxes which are later then re-sold to us. Either way, my advice is simple,

1. Figure out which harness wiring and which type of voltage sensor you have, what YEAR MAKE MODEL you need
2. Find a junkyard vehicle and take the sensor, harness
3. Wire it like a stock sensor from that vehicle, use continuity at the ECU to verify wiring, dont assume anything.

If this fails keep in mind the reluctor could be walking. I've had engines where pressing the clutch pushed the crank thrust forward resulting with lost crank sensor pickup. Not sure if thats an LS thing or not but you should always remember how these things work and that it takes a physical disc of some kind with teeth to pass over the sensor.

[Lakegoat]

THANK YOU!
I have the 58x sensor on the Gen V. It doesn't fit in a gen4 block. Different size sensor. As I understand it, the two outside pins are reversed from the gen 4 . The swap harness has the wires reversed, but both outside pins have 5 volts with the key on. The drawings show that only one pin should have 5 volts. Don't know where the other 5v is coming from. I will call the harness supplier this morning and see if they can get me a wiring schematic. If you think of anything else, let me know.

[kingtal0n]

yeah it should be one 5volt, one ground, one signal. Sounds like a wiring short or mess up]

thats pretty much hall effect sensors
https://www.homemade-circuits.com/li...ors-explained/

[Lakegoat]

I put that page in favorites just in case. I am still waiting on the harness mfg to call me back.

[ahmedabri97]

Did you find out the issue?
I am having same issue using same crank sensor adapter.

[Lakegoat]

On the adapter, I cut and crossed the two outside wires. You could do the same on the wiring harness if it is easier.

[tectactical]

Following. I didn't start mibe yet but it's a 2019 GenV L82 but had a harness made for an E92 vs the E90. Hope that the harness was made for the V sensors vs IV

[Lakegoat]

Since I posted that, I went out and looked at the harness and I switched the wires back. Made so many changes, I forgot.
If it's an E92, Then it should be for the GenV sensors.

[Lakegoat]

It's easy to troubleshoot once it happens to you. Hook up your scanner, spin the motor, if no rpm shows, switch the two outside wires on the crank sensor. If no cam counts, switch the two outside wires on the cam sensor. If you still have VVT and all that, then I don't know.