Lambda sensor control (electrical) (Fault in the electrical circuit) - T4 V6

Hello everyone,

When driving my bus, a very sudden and poor engine performance occurred while accelerating. Error memory says:

Address 01: Motor Label file: None
Part Number: 022 906 032 C
Part and/or Version: MOTRONIC ME7.1 G 0004
Encoding: 00013
Operating Number: WSC 60712
VCID: 0B1E634A395E711
6 errors found:

17559 - Bank 1; Mixing Adaptation Area 1
P1151 - 35-10 - Undernutrition threshold crossed - Sporadic
17560 - Bank 1; Mixing Adaptation Area 2
P1152 - 35-10 - Undernutrition threshold crossed - Sporadic
16514 - Bank 1 Probe 1
P0130 - 35-10 - Electrical Malfunction in Circuit - Intermittent
16684 - Combustion failure detected
P0300 - 35-10 - Sporadisch
16689 - Cylinder 5
P0305 - 35-10 - Combustion misfire detected - Sporadically
16686 - Cylinder 2
P0302 - 35-10 - Combustion misfire detected - Intermittent

Readiness: 0000 0000



No problems in gasoline operation.

I now want to check the lambda sensor. The repair manual specifies that you should use the basic settings to call up measurement block 034, which should then initiate a test run, which requires an increase in the idle speed so that the catalyst can reach the required temperature of 350 degrees Celsius. This is not working: the idle speed remains unchanged. Question: Why?

I then performed a test run with the input of the MWB (Motor Control Unit) directly into the engine control unit: while the test run for sensor 2 is quite quick, the message for sensor 1 (before the cat) fluctuates several times between "TEST on" and "TEST off" before finally displaying a message indicating that the sensor is OK after a few minutes. Is this delay normal, or could it be a sign of the impending failure of the lambda sensor?

I'll focus my ears/eyes.

Greetings
Stephan

PS: As you can see, the label file is missing. The file was present in version 10.6.4, but for some unknown reason, it has disappeared in version 11. Is this fixable? In the label files, you can find the file (This is called: Label file: RKS\022-906-032-BDB.lbl)

Hello,

Before you adjust the lambda sensor, you should first check the air-fuel mixture adjustment in block 32 after the engine has been running for a short time with gasoline/gas.

If everything is okay with gasoline operation and the engine is running lean on gas, it probably means it's not getting enough of it.
Possible approaches: Gas nozzle, pressure regulator, leaks.

Background information:
/viewtopic.php?t=21836

To the label file: This might be due to the fact that your motor is an AMV and not a BDB.
We will investigate why it is not active/is not active. In the meantime, you can install VCDS-RKS 11.11.5: http://shop.dieselschrauber.de/support-downloads.php

Best regards, Rainer

Gas nozzles and their wiring (system with...) (Vaporizers) are okay?
This failure, or malfunction, is not necessarily detected by the engine control unit (ECU), if it is detected at all.

Thank you for the answers!

I currently cannot compare long-term correction values. There are currently simply too many combustion failures on 2 cylinders when it comes to gas. The value for gasoline is 6.3% after 115 km.

A faulty pressure sensor (gas system) was replaced 9 months ago, after diverging correction values made starting the engine on gasoline in cold weather almost impossible. This issue has completely disappeared since the replacement. Therefore, I don't suspect the same cause, although the "lean" reading definitely comes from the gas, but it has also occurred in the past, as soon as the wet and cold season began. "He was idling" also, but that he runs poorly on gas is a new development.
I just want to check everything around it thoroughly before I contact the gas company; after all, they live a few hundred kilometers away.

Label-Datei: After the update, it picks up the AMV.clb (which was already in the Label folder before), and everything seems to be working fine.

Greetings
Stephan

To avoid losing sight of the original questions:
Why doesn't the test routine start via the default settings?
Does need to meet a specific threshold to be considered positive?
Greetings
Stephan

Hello,

Quote:

Why doesn't the test routine start through the basic settings?

Due to the errors?

Best regards, Rainer

Hello Rainer,
auf Ihren Hinweis, ich kann keinen Reim finden, oder soll er tatsächlich bedeuten, dass eine bestimmte Prüfroutine durch VCDS von Fehlern, die im Betrieb ausgelöst werden, unterbunden werden könnte?
In this case, the errors caused by gas operation were, in fact, cleared - the throttle valve was re-calibrated via MWB 060, but a few dozen kilometers had also been driven on gasoline.
Greetings
Stephan

Hello,

This can happen, but it doesn't have to. In this specific case, I lack the necessary experience, but one should consider this possibility.
With newer engines, the conditions must also be right, e.g.

Quote:

; activate basic settings ; Press the brake pedal while simultaneously pressing and holding the accelerator

Was was the error memory empty when you tried the default setting?

Best regards, Rainer

Hello,

yes, the error memory was (properly) cleared.

However, the RLF does not mention pressing the accelerator pedal. Only the operation and holding of the brake pedal is required; the increase in engine speed should be controlled by the engine control unit.

Greetings
Stephan