Author Topic: Need help understanding a code 0x3A1B61  (Read 4972 times)

Thebmwman

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Need help understanding a code 0x3A1B61
« on: August 03, 2023, 09:03:41 AM »
Hi there to all

Have a 2019 BMW R1200GS Adventure LC (K51) with the following code 0x3A1B61
Odometer 4044 km
VIN WB10A0207JZ961523
Been searching in the forum for this code with no result
Not much info on the web in this regard either
Is there any document or web page where to search for this code and his transcription if available?
GS 911 code description is "Camshaft sensor input signal, no signal edge detected, input level low"
Could someone help me to understand this code?

Kind Regards
Ray

Jughead

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Re: Need help understanding a code 0x3A1B61
« Reply #1 on: August 03, 2023, 09:59:09 AM »
I would just reset it and see whether the error reoccurs.

Thebmwman

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Re: Need help understanding a code 0x3A1B61
« Reply #2 on: August 03, 2023, 10:10:36 AM »
The code has been reseted and persist

schuppi

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Re: Need help understanding a code 0x3A1B61
« Reply #3 on: August 03, 2023, 11:33:29 AM »
Hello

Fault Code Description
DME detects no signal from the camshaft sensor.
No camshaft signal is present within several crankshaft revolutions.
Service Plan
Check wiring, wiring harness and plug connector to camshaft sensor.
Check wiring harness plug connector to DME
Check camshaft sensor.
Remove camshaft sensor and check for contamination (metal abrasion).
Check sensor gap to camshaft.
Fault Impact
Emergency operation with limited vehicle dynamics.
Significantly reduced maximum engine speed.
Camshaft adjustment, not functional.
Service Notes
After rectifying the fault, reset the mixture preparation adaption values.
Schönen Tag
Wolfgang
                                       talk less, drive more

Thebmwman

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Re: Need help understanding a code 0x3A1B61
« Reply #4 on: August 03, 2023, 11:44:36 AM »
Check wiring, wiring harness and plug connector to camshaft sensor.    DONE, cleaned, and checked
Check wiring harness plug connector to DME.    DONE, cleaned, and checked
Check camshaft sensor.   Is there any procedure to check this sensor as such?
Remove camshaft sensor and check for contamination (metal abrasion).   DONE, cleaned, and checked, no debris found
Check sensor gap to camshaft.
Fault Impact
Emergency operation with limited vehicle dynamics.
Significantly reduced maximum engine speed.
Camshaft adjustment, not functional.    Does it means that any camshaft could be out of time?
Service Notes
After rectifying the fault, reset the mixture preparation adaption values.    Have not make it yet
« Last Edit: August 03, 2023, 11:47:05 AM by Thebmwman »

schuppi

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Re: Need help understanding a code 0x3A1B61
« Reply #5 on: August 03, 2023, 11:07:56 PM »
functional description
The camshaft sensor is designed as a non-contact Hall sensor. It records the 6 different flanks of the increment wheel on the intake camshaft.

From this, the DME calculates:
camshaft speed
Exact position of the camshaft
If the camshaft sensor fails, an emergency engine operation is possible with the crankshaft sensor.

BMW recommends an oscilloscope to measure this Hall IC.
Voltage change between 0 and 5V.

Wiring connector
1 > sensor output
2 > ground
3 > voltage supply 12V
Schönen Tag
Wolfgang
                                       talk less, drive more

Thebmwman

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Re: Need help understanding a code 0x3A1B61
« Reply #6 on: August 04, 2023, 06:28:06 AM »
Is there any parameter in this regard that can be measured with the GS911 data? If so, would you instruct me how to do it?

Borgia

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Re: Need help understanding a code 0x3A1B61
« Reply #7 on: August 04, 2023, 06:53:14 AM »
In the absence of an oscilloscope I would disconnect the sensor from the bike and apply 12V to the sensor and connect an LED with a resistor to the 5V logic level output and rotate the engine by hand. The LED will indicate the presence/absence of the signal as the cam rotates.
Hey BMW: No service manual = no new bike.

Thebmwman

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Re: Need help understanding a code 0x3A1B61
« Reply #8 on: August 04, 2023, 07:17:47 AM »
Oscilloscope is available but I was wondering if there may be a function, data, or similar that can help analyze the sensor at the GS911.
« Last Edit: August 04, 2023, 07:26:28 AM by Thebmwman »

Thebmwman

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Re: Need help understanding a code 0x3A1B61
« Reply #9 on: August 05, 2023, 10:07:10 AM »
BMW recommends an oscilloscope to measure this Hall IC.
Voltage changes between 0 and 5V.

Try with an oscilloscope and digital voltmeter with the following results at the connector with the sensor unplugged

Wiring connector
1 > Sensor output.    11.4 Volts
2 > ground.   0 volts
3 > voltage supply 12V.   12.5 volts

Since there is 11.4 volts where the sensor signal of 5 volts should be, shall I assume the ECU is a culprit?

Will bench-test the sensor and show the results to validate I am doing the test in the right way.

Thebmwman

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Re: Need help understanding a code 0x3A1B61
« Reply #10 on: August 07, 2023, 08:21:21 PM »
Here is a video on the oscilloscope test at the camshaft position sensor, please help me to confirm a lousy sensor fault or any other comment in this regard
https://youtube.com/shorts/BoDeLelpKKQ?feature=share


schuppi

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Re: Need help understanding a code 0x3A1B61
« Reply #11 on: August 07, 2023, 11:10:27 PM »
Hallo

Thats how the pictures looks on BMW scope
Schönen Tag
Wolfgang
                                       talk less, drive more

Thebmwman

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Re: Need help understanding a code 0x3A1B61
« Reply #12 on: August 07, 2023, 11:53:07 PM »
Well

According to the pictures, the sensor should be generating something around 10 volts right?
This sensor is generating barely 500 mv
Take a look at the volts scale on the osciloscope

There is also the volts at the connector

Wiring connector
1 > Sensor output.    11.4 Volts
2 > ground.   0 volts
3 > voltage supply 12V.   12.5 volts

Is there a valid reason why to have just barely 1-volt difference at terminals 1 and 3?

Am I right?

« Last Edit: August 08, 2023, 12:02:08 AM by Thebmwman »

Thebmwman

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Re: Need help understanding a code 0x3A1B61
« Reply #13 on: September 02, 2023, 02:09:47 AM »
Finally, the problem has been solved

A faulty sensor was the problem

However, it took 3 sensors to find a working one (the first 2 purchased at the local dealer)

A Third OEM part from a remote stealer solved the problem

I strongly think the local BMW stealer is selling Chinese BMW spare clones or something like that (not the first time this has happened with other parts)

Even some BMW Motorrad services have been made with HiFlo and Mahale filters as I have seen

Is this something common to happen with the BMW dealers to sell non-OEM spares?

Have someone else experienced the same issues before with the stealers?

sarausa

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Re: Need help understanding a code 0x3A1B61
« Reply #14 on: June 14, 2024, 06:41:10 AM »
This error code indicates that the vehicle's control system cannot receive or process the signal Suika game from the camshaft sensor correctly. This can lead to problems such as difficulty starting the vehicle, unstable operation or loss of power.