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Vw Transporter T5 1.9TDI no boost

Posted By Kaerby Monday, November 12, 2018 4:27:17 PM
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Kaerby
 Posted Monday, November 12, 2018 4:27:17 PM
Saturday Job

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Hi

Got this T5 in from another auto workshop that have given up on it.

spec:
year 2006
Engine : 1.9 Tdi AXB
Manuel gear
ECU 038 906 016N

Faults:

i makes no boost , the Turbo wacc aktuator is not being aktivatet

Fault codes:

at first

P0238 turbo boost to high
P0113 indtake air temp to high



Air indtake temp = 137G
Water temp = -7G
Fuel temp = 39G
Boost needs to be = 163,2 mBar
Boost it is = 2193,0 mBar ( it thinks it is but it is not)



now

P0237 turbo boost to low.



First i fixed the temp faults ,
the plus for water temp was on the fuel temp sensor . an the fuel temp plus on the water temp.

next i looket at Air temp , the wires from map sensor pin 1 ( Ground) was broken an pin 2 air temp signal
was not good. new wires og pins in Map sensor plug an Ecu plug

an the air indtake temp was fixed .

Now the fault code have change to P0237 ( boost to low )
it still thinks the boost is 2193 mBar with the engine off

went to check pin 2 an 3 in the map sensor
there i not 5 Volts in pin 3 . it goes to pin 62 in ecu an there i not 5 volts there also
Pin 4 i am not sure what to read there ?

i change the wires on pins in plugs , in Map sensor plug an Ecu plus

but stil no change to the problem.

if i run a turbo test with Vcds , the turbo an N75 works perfekt , but ecu can not see the boost in
the map sensor.

the Error code does not go away pops right up again every time i put KO

so i think the ecu is bad , godt an other from a auto braker
clone the to ecu no problems, but still no boost
an still it thinks i makes 2192 mBar KOEO



this have been change to new parts from the last workshop
Maf
N75
Map sensor
Water sensor
Fuel sensor.

i don´t know what my next move is now ?

i have also chek
fuses
12Volts live feeds to the ecu
ground feeds to ecu

no faults
sorry for my bad english i am from Denmark
SB126
 Posted Monday, November 12, 2018 5:09:11 PM
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if the ECU is thinking its seeing over 2 bar of boost it never going to open the N75, and let vacuum back to the turbo,

You need to see about 1 bar on the MAP KoEO, sort that out and the rest should fall into place..
Kaerby
 Posted Monday, November 12, 2018 5:35:59 PM
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Yes i Can see that.

But what Can make it not 5 volt to
The map sensor

I’am a bit stock on what my next step is now
columbo
 Posted Tuesday, November 13, 2018 3:52:39 AM
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pin 62 should be 5 volt output for boost sensor, but this might be shorted to ground.

cut the wire at the ecu plug and test output on wire.

pin 4 at boost sensor is signal back to ecu.

good luck

i have ran 4 new wires from ecu to sensor before as the wiring does get damaged/corroded.




oh and one more thing.............give it a wash.
Crasher
 Posted Tuesday, November 13, 2018 3:54:54 PM
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I had this a few months ago on the same model, it was water in the electrics box under the battery in the multi connector.

Vile Invention

Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

W.H. Auden (1907-1973), A Curse:



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