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VW Passat b5 - sensor error g40

grzegorz.pilu 12447 32
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  • #1
    grzegorz.pilu
    Level 12  
    Hello all. Good day. I have a problem locating the fault in the Passat b5 1.9 BLS. The problem concerns the camshaft sensor g40 sensor error. The customer came to me after exchanging a set. clutch and after a week said that the car started to burn heavily. Actually, you have to shoot about 3s. There is a constant error 00833 G40 impulsable signal (writes from memory). So I changed the sensor g40 and nothing, I replaced the sealer with a pulse ring behind the two-legged and nothing, raised starting doses on the map (KESS, WINOLS) and nothing. From the observation I can see that the VCDS in the engine in group 4 and in the 4th window shows 0.0, regardless of how I change the timing wheel. The client tells me that the problem was observed when he tried to fire once and when he was filming he heard a strong thunder, a thump and apparently from then on he smokes heavily. I attach still a photo from the oscilloscope of both shaft and shaft sensors and please confirm whether you can not see the synchronization and answer the question if it is possible that the pulley on the timing side is moved (no wedge) can cause such an error. I will add that the timing setting has been checked and is ok. VW Passat b5 - sensor error g40 VW Passat b5 - sensor error g40
  • #2
    adam7009

    Level 39  
    There is no signal from the shaft sensor, if it was out of range, you would not start it at all.
  • #3
    grzegorz.pilu
    Level 12  
    And the red impulses on the oscilloscope? It's just the shaft sensor, I even put a new beam from the sensor to the controller.
  • #4
    adam7009

    Level 39  
    Maybe the driver itself does not see the signal.
  • #5
    grzegorz.pilu
    Level 12  
    I thought about it too. I have already ordered alliedrogo driver to eliminate the next thing, theoretically it is possible.
    The error can be deleted, it returns after an attempt to fire.
  • Helpful post
    #6
    bolus11
    Level 14  
    oh ... b5 did not have a BLS, so I'm probably talking about B6 :) if b6 check the timing, synchro will not set as if it does not see the position of the shaft or shaft. In the passages b6 and probably all the vagas from these years, the peszel ate a bunch of cables that goes by the starter ... pull it out and see if it is not eaten ;) Of course, the timing checked whether it is in its place yes?
  • #7
    Michal2002
    Level 22  
    I once had a riveted engine beam in this model but I would check the timing.
  • #8
    waldek500
    Level 11  
    I'll warm up the topic. After replacing the engine, it does not start. Sensor error g 40. Timing at point.
  • #9
    bolus11
    Level 14  
    waldek500 wrote:
    I'll warm up the topic. After replacing the engine, it does not start. Sensor error g 40. Timing at point.

    do not heat up just check everything that was written above.
  • #10
    adam7009

    Level 39  
    waldek500 wrote:
    I'll warm up the topic. After replacing the engine, it does not start. Sensor error g 40. Timing at point.
    without a sensor, it fires, only a few times more must be turned off. Tune in the sensor and then try to smoke.
  • #11
    Krystian_85
    Level 2  
    Hello, I have a similar problem.
    What should voltage be on the pins?
    For me error 19464 camshaft sensor circuit, value out of limits, new sensor (replacement). The car is burning in a check. Sometimes, if it lights only on 3 gars. Is it also possible in this case that the crankshaft position sensor is dead? whether the indication of the computer is unambiguous.
  • #13
    Krystian_85
    Level 2  
    The beam is ok. The problem returns after the engine has been warmed up, there are no errors and no problems on the cold one.
  • #15
    Krystian_85
    Level 2  
    How can I check it? Now there is a 16725 error .... some circus.
  • #16
    grzegorz.pilu
    Level 12  
    Hello
    in my case, unfortunately, I did not find the reason because the customer recently sold the car (he even got used to the fact that it harder smokes)
    to sum up, I replaced the shaft and shaft sensors (the one on the back with sealant ... everything for locks), the bundles from these sensors, the controller (synchronization of the old one and the update in order that it was not there), the battery and finally the starter ... injections on the table needle
    I regret the fact because I like hopeless cases but I would have to buy it from the client to continue
    topic I think it is worth leaving open for a collection of useful information
  • #17
    leszek2712
    Level 2  
    after replacing the engine, attention was not paid to the camshaft wheel 99% is different
  • #18
    chymek1234
    Level 10  
    I have the same problem but in the B6 2.0 TDI BKP passat

    VcDS The problem is that in the engine 01, group 051 shows in position 2 the value of the camshaft sensor (g40) and they are the same as the shaft (g28), the car fires hard on warm.

    Sensor replaced, beam checked with a multimeter for a break from the sensor to the controller - everything ok.

    Have any ideas ???

    Sync angle to 0.
  • #19
    repcak11
    Level 12  
    Hello.
    In this case, gentlemen, plug in the oscilloscope and check the actual mileage from the shaft and camshaft sensor, compare it with the waveform library, e.g. (...) I will not mention the name of the company for obvious reasons, do not follow VCDS. These problems appear, for example, after replacing the timing, a badly seated sensor.
  • #20
    chymek1234
    Level 10  
    Write to me on priv with what should I compare it. Tomorrow I will check the seating of the camshaft sensor. Thank you . I'll let you know tomorrow.
  • #21
    adam7009

    Level 39  
    chymek1234 wrote:
    the car starts hard on warm.
    this is not a problem of the shaft, the standard improvement is the starting dose for a warm engine and it burns from the "shaft rotation".
  • #22
    chymek1234
    Level 10  
    adam7009 wrote:
    chymek1234 wrote:
    the car starts hard on warm.
    this is not a problem of the shaft, the standard improvement is the starting dose for a warm engine and it burns from the "shaft rotation".


    Adam may be right, but why doesn't he show me the correct values for the camshaft sensor?

    It can be set by vcds or you need to change this dose by the tuner
  • #23
    adam7009

    Level 39  
    I do not know why it shows that, I know that changing the dose by the tuner will help, vcds can only be changed slightly.
    You have something to read and write the driver, you can contact us, we will advise you.
  • #24
    chymek1234
    Level 10  
    In the cold, the camshaft synchronization is 0.35 and in the warm one 0.0.

    I have nothing to do with eprom

    I will add that the car muli up to 2,000 revolutions then it's ok.
    This is also why I lean on the camshaft
  • #25
    grzegorz.pilu
    Level 12  
    chymek1234 wrote:
    I have the same problem but in the B6 2.0 TDI BKP passat

    VcDS The problem is that in the engine 01, group 051 shows in position 2 the value of the camshaft sensor (g40) and they are the same as the shaft (g28), the car fires hard on warm.

    Sensor replaced, beam checked with a multimeter for a break from the sensor to the controller - everything ok.

    Have any ideas ???

    Sync angle to 0.

    hello ... I think the problem is stereotypical and it's called hotStart and it's not about the size of the doses but the threshold (turnover) of their occurrence, you have to read the flash, not the eeprom. For example, Mpps is diabolically without a problem, but it seems to me that the last update will also solve the problem, because apparently Volkswagen made a patch for it ... apparently
    greetings
  • #26
    chymek1234
    Level 10  
    Maybe you are right, but explain to me what the starting dose for a strange start on warm, when cold is great.
    Besides, why are the values of the camshaft position sensor wrong?

    I would like to very much scan the same engine with passat b6. The indications show as I thought so changing a hotstart dose is unnecessary and not needed because this is not the problem. I will replace the sensor with another one
  • #27
    marszałekkom
    Level 24  
    Changing the dose is not a solution to the problem but a workaround. The cause of the problem is unknown.
  • #28
    grzegorz.pilu
    Level 12  
    marszałekkom wrote:
    Changing the dose is not a solution to the problem but a workaround. The cause of the problem is unknown.

    Hello
    yes, it is impossible to disagree, but to paraphrase a classic of recent times is an alternative fact
    By studying the moza temperature map you will find out that VW Passat b5 - sensor error g40
    fuel injection starts from 200 rpm at 20 degrees C, but at 70 from 250 rpm
    up to 20 degrees injection in full range and the magic of hotstart is that the engine (read starter) due to its condition is not able to reach 250 rpm after reaching 70 and more
    This may serve as a clue when looking for an answer to the bug
    greetings
  • #29
    marszałekkom
    Level 24  
    So you can check if the hot engine starts easily with disconnected temperature sensor, or with a 3 k? resistor inserted, which corresponds to a temperature of approx. 20 °.
  • #30
    chymek1234
    Level 10  
    marszałekkom wrote:
    So you can check if the hot engine starts easily with disconnected temperature sensor, or with a 3 k? resistor inserted, which corresponds to a temperature of approx. 20 °.


    Try to fire after disconnecting the fuel sensor ?? Do you think the sensor is nuts?

    You're right that changing the dosage is not a solution at all.
    It is as if you hit your right finger because your left hand hurts and you forget about the pain in your left hand.

    Today I replaced 3 wires from the sensor to the engine controller. Unfortunately, to no avail: / it still does not show the value of the rotational camshaft sensor :(