Crankshaft Position Sensor Relearn Procedure

[el dooderino]

Hi everyone,

A little background info on my situation. I took my 2010 Genesis 4.6 for a trans and rear diff fluid change, and the car ran fine after the maintenance was done. The next day though, I turn my car on and it idled really rough in park. Then when I came to the first stop in my parking lot, my engine shut off while in gear! All of the lights on my dash illuminated and then shutoff just as quickly. The radio was still on, and I was getting AC. No code was thrown and the mechanic who looked at it couldn't replicate the issue, nor could they tell that anything was out of place on the car, so they told me not to worry about it... it has happened twice since then...

After doing quite a bit of reading through the forums, I found a few people describe nearly identical experiences as mine, and they found that their crankshaft position sensor was that cause of the issue.

So as a DIY kind of guy, I ordered a new sensor, and read through the service manual and some guides on switching out the part. Seems simple enough to replace if you do the reading, but I'm unsure of one thing. The packaging for the new sensor says that a possible relearn procedure may be required after installing.

Nothing in the service manual, guides, or threads I've found on here regarding the sensor mentions a relearning procedure.

Does anyone know if the 2010 Genesis 4.6 has a relearn procedure for the crankshaft position sensor? I don't have a capable OBD2 monitor to initiate a relearn procedure, so I'd like to find out before I replace the sensor.

 

[air540g]

I don't think it is crank sensor problem. If this sensor is failure it is difficult to start the engine.

Buy a cheap obd scanner is very easy to find problem.

ebay: NEW Bluetooth OBD2 OBDII Car Diagnostic Code Reader Scanner Tool Android/PC/iOS

 

[el dooderino]

I don't think it is crank sensor problem. If this sensor is failure it is difficult to start the engine.

Buy a cheap obd scanner is very easy to find problem.

ebay: NEW Bluetooth OBD2 OBDII Car Diagnostic Code Reader Scanner Tool Android/PC/iOS

My diagnostic tool isn't showing any codes.

 

[mikec]

The crankshaft position sensor is just a Hall effect sensor - a magnetic field and electrical coil work together to detect metal teeth passing by. It is located on the transmission bellhousing, very close to where it bolts to the back of the engine. Standing at the driver side fender, peer downwards towards the bellhousing. The CPS is almost at the very top and is fairly easy to remove if you have long extension shafts for your tools. Follow its wires upwards and you will see where they are clamped at various spots and you will see the connector. There is no "learn" procedure or post-installation calibration/adjustment step necessary; just install it and start the engine. Clear any OBD-II codes with your scanner.

The CPS is fairly critical to the engine fuel and ignition system; without it none of the "timed" functions work so the engine flat-out won't run. The PCM (engine fuel/ignition computer) is pretty stupid when it comes to detecting a bad CPS however: it sets an error code if the PCM sees multiple camshaft signal pulses without seeing CPS pulses... but only while the engine is trying to start. Once the engine is running, if the CPS dies at that point, the engine will stall but no OBD-II error code will be set.

My 2009 V8 had similar symptoms: after sitting OFF overnight, it would start normally and run properly. But coming to a stop light, after it had been running about 5 minutes, it would stall. Generally it would re-start easily. Once past 10 minutes of running, it never stalled again for the rest of the day... even after being parked for a couple of hours during the day. Only after an overnight shutdown did it act stupid. A dealer re-seated every electrical connector they could find and that helped for several months... then when the problem returned it quickly got worse... to the point the engine would stall anytime and ran rough sometimes as well. At this point it randomly spit out "random misfire" OBD-II codes; a few days later the dealer's code reader could not even connect to the PCM. That's when the dealer finally decided the PCM must be kaput. The cure was a new PCM. Over $1600 for the part.

mike c.

 

[Ozy44]

If you are kind of a DIY guy, I would start with cleaning the MAF sensor and throttle body. This may not fix your issue but certainly won't do any harm. How many miles on the car?

 

[el dooderino]

If you are kind of a DIY guy, I would start with cleaning the MAF sensor and throttle body. This may not fix your issue but certainly won't do any harm. How many miles on the car?

Yeah I'll definitely give that a try. I've got 91K on my 4.6. Really hoping that I can put a few thousand more on it after fixing this.

 

[el dooderino]

Update on this. I took my Genesis to a dealership on a coworkers recommendation. Turns out the folks who did the transmission fluid exchange did not fill to the correct level. Nearly 2 quarts low is what the dealership reported. Had the dealer top off the fluid, and the car has run as smooth as ever since. Problem hasn't occurred in nearly a week since I got it back from the dealer. Hopefully this did not cause any significant wear and tear or damage to the tranmission, otherwise

 

[Ozy44]

So your car was stalling because of low transmission fluid? I didn't know that was possible.

 

[joegr]

So your car was stalling because of low transmission fluid? I didn't know that was possible.

It's (causing an engine to stall when the fluid is low) not an uncommon symptom with automatic transmissions in general.

 

[el dooderino]

What was explained to me was that the transmission couldn't generate enough hydraulic pressure while moving at low speeds, such as coming to and from a stop, so the transmission cuts off in an attempt to prevent damage. Why this didn't throw a code is beyond me though.

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[Ozy44]

Did some reading after my above post and discovered that it is possible. Also read that when it gets to the point of stalling, it may have already done some damage. If I were el dooderino, I would be contacting the shop that did the drain and fill and give them an ear full. Maybe even see if they will warranty the work. Yes , I know that's never going to happen. This is why I do my own work whenever I can.

 

[el dooderino]

Did some reading after my above post and discovered that it is possible. Also read that when it gets to the point of stalling, it may have already done some damage. If I were el dooderino, I would be contacting the shop that did the drain and fill and give them an ear full. Maybe even see if they will warranty the work. Yes , I know that's never going to happen. This is why I do my own work whenever I can.

Yeah I like doing most of the maintenance myself, but unfortunately I don't have the proper equipment to perform a transmission fluid exchange. I've gotten in touch with the shop that did the job, and they are launching an investigation. The Hyundai dealer that discovered the low fluid documented this well and I'm prepared to take the situation to the BBB after getting a transmission specialist to diagnose any damage.