Golf 7 2,0TDI Aussetzer im Teillastbereich | Posts 24+

Hi there,
The first error entry

Quote:

: Address 02: Transmission (J743) Label file: DRV\0D9-927-770.clb Part number SW: 0D9 300 041 N, HW: 02E 927 770 AQ. Part number: DQ250-6F MQB H53 4504. Revision: 03253104 Serial Number: TFK01409150204 Coding: 0014 Operating number: WSC 00028 028 00066 ASAM Dataset: EV_TCMDQ250021 001001 ROD: EV_TCMDQ250021.rod VCID: 23121F5A5B5C88A36F0-8076 Two error codes found: 10657 - Engine speed signal from the engine control unit. P0726 00 [002] - Implausible signal. Occasionally - unconfirmed - checked since last deletion. 10763 - Starter motor activation via the selector lever sensor. P1734 00 [002] - - Occasionally - unconfirmed - checked since the last deletion

still holds another possibility. Please, during the next test drive, if there is an error, read out the fault memory of the engine and transmission before stopping the engine.
It's not that the DSG (direct-shift gearbox) is malfunctioning – it wants to shift, but can't – and therefore the engine torque is being reduced. There are a few forum threads about this online.
hg
Herbert.

Hello everyone,

Even three months later, the problems unfortunately haven't gone away; in fact, they seem to be getting worse.
I visited two Volkswagen workshops in the meantime, and neither of them found any broken wires or other issues. Unfortunately, two independent garages also couldn't find anything.
I'm stuck and considering trading in the vehicle; it seems I can't make any further progress. Two weeks ago, I had the DSG oil changed as required at 120,000 km, because I thought the problem might be with the DSG transmission.

I'm having trouble with all these Log readings; I don't have much experience identifying errors. Last week, in addition to the usual jolts when stopped, the following occurred: While in "D" mode, the brakes were applied at a traffic light.
Suddenly, the engine cut out. There were no error messages, nothing on the display. I turned off the ignition and restarted the engine, and it ran normally. This happened for the second time this week. I checked all the wiring earlier, but I couldn't find any faults. Then, as a test, I disconnected the mass airflow sensor (MAF). The glow plug indicator blinked, which is logical. The car drove normally, although it still felt like it was misfiring. Therefore, I'm ruling out the MAF sensor for now.My girlfriend, who mainly drives the car, also thinks that when it stutters, it brakes as well – not normal engine braking, but a strong braking force during the jerks. I'm at a loss for what to do next; do you have any more suggestions?

Thank you very much. Best regards, Frank.

Hello, here is an API from Volkswagen.

Tachometer/Speed sensor is not required.

DQ250
Information:
The mechatronic unit for the DQ250 gearbox (MQB platform) is no longer compatible with...
Equipped with an input speed sensor. The transmission control unit uses this...
Signal from the engine control unit (ECU).
The signal is transmitted via a separate power connection between the motor control unit (MCU) and...
introduced to the transmission group.

Possible errors:
The error code P072600 – speed signal – is only recorded in the transmission control module (TCM) memory.
"Implausible signal from the engine control unit."
There may also be malfunctions in the transmission function (e.g., jerking). There may also be malfunctions in the transmission function (e.g., jerking).

Solution/Workshop/Action/Repair:
Check the power cable connection between the motor control unit (MCU) and the transmission control unit (TCU) (pin not connected).
(Locked/engaged, but the retaining clip on the transmission gear selector is not locked).

(If no error can be found, try replacing the cable as a test.)

Best regards,
Dago

Hi everyone, luckily I have a second vehicle with the same engine/transmission, and I was able to check it out. The car drives great, but it also has that speed signal error in the transmission.

I was able to create another log today.
What I've noticed is that the tachometer now drops to zero along with the engine speed during the misfires.
Attached is a log file.

Thank you very much.

Hello,

Is there a glitch or error in the log, and if so, where?

Best regards, Rainer.

Hello, at the 46-second mark, a marker was placed shortly after.

Best regards,

Hello,

Based on the data, I don't see any interruptions in the measured values or changes to the sampling grid of the measurements around the 46-second mark. Therefore, I would rule out problems with the power supply from the engine control unit.

Despite a slight increase in the accelerator pedal position, the target value for rail pressure decreases. This means that if you haven't been driving on an undulating road, the engine control unit likely intentionally reduced the injection quantity. Lower injection quantities are typically used with lower rail pressures.

Most likely, the problem is caused by faulty sensor signals. For example, this could be related to the mass airflow sensor (MAF), brake pedal position/brake pressure, or any of the various temperature sensors (coolant, exhaust gas temperature, charge air temperature). You should check these one by one if you experience jerking. It's also essential to inspect the wiring and connectors, as well as any areas where the cable harness for the engine control unit or the sensors might be chafed.

Sure, here is the translation of the text from German to English:

"LG" translates to "Best regards" or "Sincerely" in English. It is a common abbreviation used at the end of emails and letters.

Hello,

Here's a log of the turbocharger boost pressure; I'll be creating more logs using different sensors.
It definitely has to be a sensor that can shut off the engine while idling without storing any error codes. How does start-stop work? Does it come from the engine control unit (ECU)? Which signal does it cut off?

Best regards, Frank.

Hello,

In your log, I only found a marker at 333.92 seconds. A little earlier, there's an entry that says "Charging pressure sensor between ND and HD turbocharger: adapted" (why not simply log the actual charging pressure?). The value is 2697 mbar.
It's possible that the engine control unit is completely shutting off the fuel injection in this situation, which could explain the loss of power.
Normally, this should also generate an error code in the engine control unit's memory.

Given the sudden jump in value, I'm ruling out any issues with the turbos themselves. Is the wiring to the pressure sensor okay and undamaged?

Best regards, Rainer.

Hi there,

Has the bug been fixed? I'm experiencing the same problem, but I can't find any errors.

Best regards,
Done.

Hello, sorry for the late reply regarding what the error was.
While changing the oil with the engine running, I accidentally bumped the crankshaft position sensor, and the engine stalled.
I then had it replaced at a Volkswagen dealership, and so far everything is working perfectly again!

Thank you for your help.
Best regards,

Thank you for the feedback!

Maximilian wrote:

I wanted to leave a thank you here. I had the same problems with my Golf 7 2.0 TDI with a 6-speed DSG, manufactured in 2014, at just over 120,000 km. No one at the workshop could help me because the problem only occurred sporadically and there was no error code stored in the system's memory. I also fiddled with the crankshaft position sensor, and it sputtered briefly once. I then replaced the crankshaft position sensor, and since then everything has been running smoothly again .

Thank you!