VCDS fault code clearing

[Hannu]

Hi all, I've just replaced the EGR on my 2016 T6 180hp, (not easy but more of that in another post)
I'm trying to clear the many fault code this has now brought up, I do a full scan then clear all DTC's, I confirm I'm sure I want to do this and it seems to clear the fault code only to bring them all up again on the screen,
What am I doing wrong ?

 

[mmi]

I do a full scan then clear all DTC's,

How did you try to clear the codes?

(a) under Auto-Scan - clear all DTCs​

or​

(b) all controllers separately: VCDS > Select > Controller > Fault codes > Clear codes​

T6 doesn't honor very well broadcast message sent by method (a) thus fails to clear faults.

In my experience better use method (b) on T6.

 

[Hannu]

How did you try to clear the codes?

(a) under Auto-Scan - clear all DTCs​

or​

(b) all controllers separately: VCDS > Select > Controller > Fault codes > Clear codes​

T6 doesn't honor very well broadcast message sent by method (a) thus fails to clear faults.

In my experience better use method (b) on T6.

Yep been trying method A will try B in the morning,
Many thanks

 

[Pauly]

Or the faults are still present ?
Check the date/mileage on the faults and see if it’s the same after clearing, this will confirm if error has failed to clear or the fault is still present

If you need more help please post a full auto scan

 

[Hannu]

How did you try to clear the codes?

(a) under Auto-Scan - clear all DTCs​

or​

(b) all controllers separately: VCDS > Select > Controller > Fault codes > Clear codes​

T6 doesn't honor very well broadcast message sent by method (a) thus fails to clear faults.

In my experience better use method (b) on T6.

Hi again and sorry to be a pain, but, Method "B" seemed to work however I now have another fault as attached file. Glow plug light flashing and as stated I have an open circuit. I've double checked the connections I removed to do the job and all seem ok.

 

[mmi]

Hi again and sorry to be a pain, but, Method "B" seemed to work however I now have another fault as attached file. Glow plug light flashing and as stated I have an open circuit. I've double checked the connections I removed to do the job and all seem ok.

No worries. That's what the forum is for.

And no , the workshop manual doesn't mention need to adapt the new EGR or even need to connect factory diagnostics tool after replacement.

Perhaps you could make another pair of blockmap files. I'm highly confident we can at least narrow down where to look into. More than happy to look into the file to learn which of the sensors belong to "circuit B"

PS. CFCA engine doesn't have exhaust gas temperature sensor 2 - thus the deviating value in freeze frame data doesn't help.

 

[Hannu]

No worries. That's what the forum is for.

And no , the workshop manual doesn't mention need to adapt the new EGR or even need to connect factory diagnostics tool after replacement.

Perhaps you could make another pair of blockmap files. I'm highly confident we can at least narrow down where to look into. More than happy to look into the file to learn which of the sensors belong to "circuit B"

PS. CFCA engine doesn't have exhaust gas temperature sensor 2 - thus the deviating value in freeze frame data doesn't help.

Oddly although it created a Blockmap when engine running it didn't save any data, The screen flashed then gave me data in real time on the screen?

 

[mmi]

Oddly although it created a Blockmap when engine running it didn't save any data, The screen flashed then gave me data in real time on the screen?

Also the file you posted is too short - it has only 254 lines instead of full 640 lines.
I have seen that glitch happening every now and then, so just another try.

 

[mmi]

The abridged blockmap shows the following measureable discrepancies:



Was the blue connector/wiring around in the E-box worked on? Although also the pedal sensor 1 is fed through the connector so unlikely left open.

Did you drive the van? If not, perhaps you could twiddle with the pedal to see if any new faults appear.
Asking because I would expect the above to trigger faults related to accelerator position sensors.

Please post a new blockmap file so we can see if any other sensors are missing voltage.

 

[Hannu]

Also the file you posted is too short - it has only 254 lines instead of full 640 lines.
I have seen that glitch happening every now and then, so just another try.

This mornings block map, this is ignition on only, again when trying to perform the task with engine running it just gives live time data on screen and doesn't save a block map

 

[Hannu]

The abridged blockmap shows the following measureable discrepancies:

View attachment 269560

Was the blue connector/wiring around in the E-box worked on? Although also the pedal sensor 1 is fed through the connector so unlikely left open.

Did you drive the van? If not, perhaps you could twiddle with the pedal to see if any new faults appear.
Asking because I would expect the above to trigger faults related to accelerator position sensors.

Please post a new blockmap file so we can see if any other sensors are missing voltage.

I didn't no but wondering if anything pulled when sliding the front bumper out into "service position". Had a good look round but cant see anything, I have moved the throttle pedal. I believe the EGR cooler pump may be on circuit "B" and of course I have worked round that area and moved it, wondering if I've broken a wire. That's my next area to look at weather permitting.

 

[mmi]

this is ignition on only,

Hmmm.... seems to be engine running blockmap?? A very short one!

 

[mmi]

when trying to perform the task with engine running it just gives live time data on screen and doesn't save a block map

Hmmm... interesting. Wondering if ECU running posssibly in some kind of backup mode has something to do with it - too busy to serve diagnostics port??



Anyways, a map with ignition on only should be enough.

 

[mmi]

Worth to check charge air pressure sensor (G31) & wiring - seems to throw weird values. Perhaps even relates to reference voltage circuit???



Item "data missing" above relates to partial blockmaps.

the EGR cooler pump may be on circuit "B"

I don't think so - the reference circuit is just reference voltage for sensors. No electric loads can't be attached to reference circuit.

 

[Hannu]

Worth to check charge air pressure sensor (G31) & wiring - seems to throw weird values. Perhaps even relates to reference voltage circuit???

View attachment 269639

Item "data missing" above relates to partial blockmaps.


I don't think so - the reference circuit is just reference voltage for sensors. No electric loads can't be attached to reference circuit.

OK So today I took the belly pan off again double checked all the connections from the underside with no joy. Took the cover off the E-box and checked all the fuses before the weather stopped play.
I'm now thinking with what you said about the blue wire and the zero reading on the accelerator and that I've moved the front bumper into the service position, if I've pulled a wire from under the E-box. That the next area to look at.
Thanks for all your help and input, its much appreciated

 

[mmi]

If the blockmap won't work you can select max 12 items for a real time view/log by

VCDS > Select > 01-Engine > Adv. Meas. Values... then tick the desired items for monitoring

The following would be interesting ones to have a closer look

IDE00191 Charge air pressure: actual value​

IDE03276 Charge air pressure sensor: unconditioned voltage​

​

IDE00348 Intake air temperature​

IDE03267 Intake air temperature: unconditioned voltage​

ENG105146 Air_flow_sensor_temperature_raw_value​

​

IDE00086 Accelerator pedal position​

IDE00392 Accelerator pedal: sensor voltage 1​

IDE01880 Accelerator pedal position 2​

IDE00393 Accelerator pedal: sensor voltage 2​

 

[mmi]

It seems that there is possibly three (3) issues with the wiring as the following sensors are on different circuits

(1)​

Charge air pressure sensor G31 is wired separately to the ECU​

(2)​

Also accelerator pedal has it's own wiring between the pedal and the ECU​

(3)​

Circuit D141 in wiring diagram has the following sensors (common 5 Volts with all sensors)​

(possibly the "Reference voltage circuit B"??)

G28 Engine speed sender​

Data seems to be ok.

---

G69 Throttle valve potentiometer​

---

G212 Exhaust gas recirculation potentiometer​

---

G247 Fuel pressure sender​

2000 bars ! Not plausible.

---

G584 Regulating flap potentiometer (turbo actuator)​

Couldn't identify related data labels - possibly mislabeled in VCDS. Anyways, suspect items missing on latest blockmap (30-31.12 logs)..

 

[Hannu]

It seems that there is possibly three (3) issues with the wiring as the following sensors are on different circuits

(1)​

Charge air pressure sensor G31 is wired separately to the ECU​

View attachment 269722

(2)​

Also accelerator pedal has it's own wiring between the pedal and the ECU​

View attachment 269734

(3)​

Circuit D141 in wiring diagram has the following sensors (common 5 Volts with all sensors)​

(possibly the "Reference voltage circuit B"??)

G28 Engine speed sender​

Data seems to be ok.

---

G69 Throttle valve potentiometer​

View attachment 269732

---

G212 Exhaust gas recirculation potentiometer​

View attachment 269733

---

G247 Fuel pressure sender​

2000 bars ! Not plausible.

View attachment 269730

---

G584 Regulating flap potentiometer (turbo actuator)​

Couldn't identify related data labels - possibly mislabeled in VCDS. Anyways, suspect items missing on latest blockmap (30-31.12 logs)..

Ok so, I had a day off yesterday, losing the will to live. As you stated there are different circuits involved here but all leading to the ECU, this morning I rechecked all under bonnet connections and vacuum pipes removed the air sensor cleaned and replaced, removed the battery and checked the ACU, nothing found.
Tried a blockmap with those you suggested but it would only allow me to check 6 on the tick boxes.
The pictures are ignition on with no throttle and one with full throttle depressed. Strange pedal position % and te sensor voltage 1 was fluctuating all the time ¯\_(ツ)_/¯

 

[mmi]

Thanks for the blockmap - much better, now 529 lines (of total 638 lines). The earlier ones were only 152 and 253 lines (of total 638 lines).
Anyways, the map confirms the weird values in post #17.


Could you please try to create a map only IGNITION ON (engine not running)?

would only allow me to check 6 on the tick boxes.

Very strange - sounds like a VCDS issue. Perhaps either reinstall the VCDS, or try the Beta version Ross-Tech: Current Beta Version
The Beta would save logs in folder C:\Ross-Tech\VCDS-Beta\Logs

all leading to the ECU, this morning I rechecked all under bonnet connections

All the mentioned sensors in post #17 are on ECU wiring loom, thus wired "directly" to connector at ECU. I'm suspecting the wiring loom got pinched somewhere.

Strange pedal position % and te sensor voltage 1 was fluctuating all the time

Partially damaged wire perhaps?

 

[Hannu]

Thanks for the blockmap - much better, now 529 lines (of total 638 lines). The earlier ones were only 152 and 253 lines (of total 638 lines).
Anyways, the map confirms the weird values in post #17.


Could you please try to create a map only IGNITION ON (engine not running)?



Very strange - sounds like a VCDS issue. Perhaps either reinstall the VCDS, or try the Beta version Ross-Tech: Current Beta Version
The Beta would save logs in folder C:\Ross-Tech\VCDS-Beta\Logs




All the mentioned sensors in post #17 are on ECU wiring loom, thus wired "directly" to connector at ECU. I'm suspecting the wiring loom got pinched somewhere.


Partially damaged wire perhaps?

What a day, I'm just thawing out, its flippin freezing .
So, removed the front of the van again and found NO trapped or pinched wiring, everything appears free and checked all the wring that may have been pulled when I placed it in "service position". I have to say that I didn't pull the front out to its full extent and couldn't see anything that may have been unnecessarily stressed.
I then tested the system by pulling off the wiring to each sensor / wiring connection around the engine. Each one pulled up a further fault code except the EGR cooler pump which made no difference ¯\_(ツ)_/¯.
I did note that during this process the original fault that I'm trying to trace did clear but returned when tested again.
At a loss again