Grounds

zzdiesel

Veteran Member
Joined
Dec 10, 2010
Location
sask. mostly now Wa.
TDI
05 passat tdi Geared BSM and Bewcam 2nd 2005 deleted ,converted and bew cam stage 2 Malone3 tune.
I am getting a few electrical codes on the Passat TDI. A few years ago there was a thread about ground locations. Anyone have it marked or know the locations. As usual no luck with the search.
 

zzdiesel

Veteran Member
Joined
Dec 10, 2010
Location
sask. mostly now Wa.
TDI
05 passat tdi Geared BSM and Bewcam 2nd 2005 deleted ,converted and bew cam stage 2 Malone3 tune.
All are engine related. MAF, implausible signal repeatably. Engine temperature once. Several times low boost. With the MAF unplugged the low boost doesn't repeat.
 

QuickTD

Veteran Member
Joined
Feb 25, 2002
Location
SW Ontario
TDI
2003 Audi A4Q 5spd 2.0 TDI 2056VK R783, 2006 Audi A4Q 6spd 2.0 TDI, 2007 A4Q 6spd 2.0 TDI
I ran into a MAF implausible code on one of my swaps last week. It had no boost leaks, new cam nothing that would normally cause a MAF code. Turned out that the MAP sensor was bad. The scaling was about 200millibar high with key on, engine off. Not enough to set a map code, but enough to cause the ECU to think the MAF value was off.
 

zzdiesel

Veteran Member
Joined
Dec 10, 2010
Location
sask. mostly now Wa.
TDI
05 passat tdi Geared BSM and Bewcam 2nd 2005 deleted ,converted and bew cam stage 2 Malone3 tune.
Is the MAP sensor on the turbo tube before the 90 degree tube into the manifold?
 

QuickTD

Veteran Member
Joined
Feb 25, 2002
Location
SW Ontario
TDI
2003 Audi A4Q 5spd 2.0 TDI 2056VK R783, 2006 Audi A4Q 6spd 2.0 TDI, 2007 A4Q 6spd 2.0 TDI
Yes. Best way to check it is to compare MAP to atmospheric pressure in VCDS with key on engine off. They should be relatively close.
 

zzdiesel

Veteran Member
Joined
Dec 10, 2010
Location
sask. mostly now Wa.
TDI
05 passat tdi Geared BSM and Bewcam 2nd 2005 deleted ,converted and bew cam stage 2 Malone3 tune.
So , MAP

Atmospheric---969 milibar
Actual----------958.5
Specified-------193.8

Is the sensor good? Strange specified. I am still repeatedly getting the MAF Po-101 I changed the MAF sensor, no improvement.
 

QuickTD

Veteran Member
Joined
Feb 25, 2002
Location
SW Ontario
TDI
2003 Audi A4Q 5spd 2.0 TDI 2056VK R783, 2006 Audi A4Q 6spd 2.0 TDI, 2007 A4Q 6spd 2.0 TDI
Sensor value seems legit. Ignore the specified. The boost map falls of a cliff to ~195millibar at 0rpm. That's normal.

Cam is good? Sure you don't have a boost leak? Maybe just a minor one. Or partially stuck EGR? Though in that case idle quality usually suffers when cold...
 

zzdiesel

Veteran Member
Joined
Dec 10, 2010
Location
sask. mostly now Wa.
TDI
05 passat tdi Geared BSM and Bewcam 2nd 2005 deleted ,converted and bew cam stage 2 Malone3 tune.
The cam is new. I have been wondering about a minor boost leak. I did have the EGR apart and it seemed good, seemed to function normally.

If I were to cap the ends of the boost assembly should it be able to hold pressure?
 
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