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Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 - Fixed #

Posted by Andy Bracher on January 21, 2011, 10:17 am

Year of Manufacture *: 2003
Engine Size and Code *: 2.5TDi BDG
( Optional ) Scanner Used: Autodiagnos , solus pro
( Optional) Fault Codes: 01268 Fuel quantity adjuster N146

Hi All,

I have the above vehicle as a non-start , cranks ok , in tank pump primes , fuel supply to injection pump ok but no fuel output to injectors.
Fault code for N146 fuel quantity adjuster is permanent. Also had three faults codes for control unit blocked , these have not re-occured but lead me to consider immobiliser problem.

No fault codes in instrument cluster but measuring block 2 shows the text " Receiver NOT OK" , dose this refer to signal from key reader or am I heading in the wrong direction.

Would the Fuel quantity adjuster fault cause a non-start?

Many thanks

Andy

Re: Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #

Posted by Matt Booth <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3028' width='330' height='300' border=0 style='border:none;'> on January 21, 2011, 7:52 pm, in reply to "Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #"
Matthew Booth

The early 2.5 TDIs suffered with this. The N146 is part of the pump and can't be changed. A new pump would fix the issue. The "Receiver NOT OK" relates to the radio clock and should be ignored.

Re: Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #

Posted by Andy Bracher <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3073' width='330' height='300' border=0 style='border:none;'> on January 22, 2011, 7:59 am, in reply to "Re: Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #"
Andy Bracher

Thanks Matt , are there any other tests to confirm the N146 as defective before I order a pump? . Have confirmed power & earth supplies at pump & continuity of wiring between pump & ECU.

Thanks again for your reply

Andy

Re: Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #

Posted by Matt Booth <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3028' width='330' height='300' border=0 style='border:none;'> on January 23, 2011, 1:11 am, in reply to "Re: Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #"

Make sure ECU and pump have good supply voltage (Min. 11.0 V). Make sure you have good fuel supply (fuel filter etc). Check MVB 018 block 3. Data below shows what to expect...

018 Injection pump
1) Injection pump supply voltage
[V]

2) Engine control unit supply voltage
[V]

3) Pump status word
0 0 0 0 0 0 0 0 No fault detected
X X X X X X X 1 Continuous current to quantity adjuster solenoid valve
X X X X X X 1 X Quantity adjuster solenoid valve defective
X X X X X 1 X X Injection pump speed sender defective
X X X X 1 X X X Injection timing defective
X X X 1 X X X X Commencement of injection not detected
X X 1 X X X X X Shut-off signal set
X 1 X X X X X X Engine speed not detected
1 X X X X X X X CAN bus data wire defective

4) Evaluation of engine speed sender pulses
0 0 0 0 One pulse outside, one pulse inside segment
X X X 1 No pulses outside segment
X X 1 X Several pulses outside segment
X 1 X X No pulses inside segment
1 X X X Several pulses inside segment

But the test plan basically states that the valve is part of the pump and if it's faulty you have to change the whole assembly. Also, these later ones have to be adapted to immo. HTH.

Matt

Re: Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #

Posted by Andy Bracher <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3073' width='330' height='300' border=0 style='border:none;'> on January 23, 2011, 1:46 pm, in reply to "Re: Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #"
Andy Bracher

Hi Matt ,

Many thanks for such a detailed reply ,will carry out tests as suggested .

Regards

Andy

Fixed #

Posted by Andy Bracher on February 3, 2011, 7:04 pm, in reply to "Re: Audi A4 Cabrio 2.5TDi BDG 2003 - Non Start, code 01268 fuel quality adjuster N146 #"
Message modified by board administrator February 11, 2011, 2:09 pm

Injection pump repaired by ECU Testing for £250 , (TPS retail for a new pump was £1600!).First time I've dealt with ECU Testing Ltd , good communication & quick repair & delivery.

Thanks again Matt for your help

Andy

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