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Fuel injector problem

Tiny
READYRANGERS
  • MEMBER
  • 2004 AUDI A3
  • 90,000 MILES
Hi, I have been having problems with my car for months. It kept throwing up implausable signal in my injectors, I had replaced them with reconditioned ones. I put the injectors away to be tested they all came back faulty, I bought four new ones. The harness under the rocker cover was also replaced as the wire was bared going to one of the injectors.I had a faulty tandem pump, pulling oil into my diesel so it was replaced. The fuel line and the tank was emptied and flushed out, the egr and the turbo viens were cleaned. When it was all put back together today and started it sounded great, it done the normal thing reached 50 degrees then threw up four injector faults. Have you any idea what can make this happen as soon as it hits 50 degrees? Oh the ecu had also been sent away and tested, it was meant to have have numerous faults and was replaced. It was sent to a different place then back to where I bought it and showed up as being fine.

Thank you
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Thursday, March 28th, 2013 AT 8:49 PM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What are the exact codes?

Roy
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Thursday, March 28th, 2013 AT 11:08 PM
Tiny
READYRANGERS
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  • 17 POSTS
Hi I dont have all the four codes just now, two off the codes are pump jet valve cylinder 4 (n243) implausible signal p1269, 17674 pump jet valve cylinder 3 implausible signal p1266. I hope this helps, I will try getting the other codes for you later.
Thank you
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Friday, March 29th, 2013 AT 9:16 AM
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
Sounds like the FP relay and load reduction relay are faulty. When you have multiple faults like that, it's usually those relays that act up.
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Friday, March 29th, 2013 AT 12:49 PM
Tiny
READYRANGERS
  • MEMBER
  • 17 POSTS
Hi thanks for the reply, I forgot to add when he had the probe on the ecu it was showing one injector running at 12v and the other three running at 40v. Would the relay problem cause this?
Thank you
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Friday, March 29th, 2013 AT 12:55 PM
Tiny
READYRANGERS
  • MEMBER
  • 17 POSTS
Hi again, I went and asked him to check the two relays. He tested them and said they were both were ok. When he had been using his probe this are the two things he said. Hold currant is missing and the beginning injection period is all over the place.
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Friday, March 29th, 2013 AT 3:16 PM
Tiny
READYRANGERS
  • MEMBER
  • 17 POSTS
Hi again, here are the fault codes it is showing. I also have a few graphs from pico scope if that would help any?
Thanks

The 4 fault codes are listed below.
4 Faults Found:
17671 - PD Unit Injector: Cylinder 2 (N241)
P1263 - 000 - Implausible Signal
Freeze Frame:
RPM: 1806 /min
Torque: 74.0 Nm
Speed: 47.0 km/h
Load: 21.6 %
Voltage: 14.29 V
Inj. Quantity: -0.49 mg/str
Temperature: 31.5°C
(no units): 16.0

17668 - PD Unit Injector: Cylinder 1 (N240)
P1260 - 000 - Implausible Signal
Freeze Frame:
RPM: 1806 /min
Torque: 74.0 Nm
Speed: 47.0 km/h
Load: 21.6 %
Voltage: 14.29 V
Inj. Quantity: -0.21 mg/str
Temperature: 31.5°C
(no units): 16.0

17677 - PD Unit Injector: Cylinder 4 (N243)
P1269 - 000 - Implausible Signal
Freeze Frame:
RPM: 1785 /min
Torque: 76.0 Nm
Speed: 46.0 km/h
Load: 21.6 %
Voltage: 14.29 V
Inj. Quantity: -1.20 mg/str
Temperature: 31.5°C
(no units): 16.0

17674 - PD Unit Injector: Cylinder 3 (N242)
P1266 - 000 - Implausible Signal
Freeze Frame:
RPM: 1701 /min
Torque: 80.0 Nm
Speed: 46.0 km/h
Load: 21.6 %
Voltage: 14.29 V
Inj. Quantity: 1.95 mg/str
Temperature: 31.5°C
(no units): 16.0
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Monday, April 8th, 2013 AT 6:52 PM
Tiny
LASARO
  • MEMBER
  • 2 POSTS
Hello. How dd you solve your problem? I sm having the exact problem on my 2.0 Tdi
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Monday, March 6th, 2017 AT 8:25 PM
Tiny
READYRANGERS
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  • 17 POSTS
Hi Lasaro. I got to the bottom of the problem in the end, after near  3000. I had sent the ecu away to three different places, it came back as being ok. They could only test about 90% of it without having the car, my fault was in the 10%. I found a company online who supplied plug and play ecu's, they sent me one out to try. It sorted the problem straight away, just took a couple attempts to get the coding right.
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Tuesday, March 7th, 2017 AT 11:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Yep I after reading this thread it makes sense, injector driver problem.

Great addition to this thread! Please feel free to help out on the site whenever it can add information that will help.

Best, Ken
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Friday, March 10th, 2017 AT 11:43 AM
Tiny
READYRANGERS
  • MEMBER
  • 17 POSTS
No problem Ken, I hope it saves somebody  1000's on repair bills. Hopefully somebody is able to help me with my question I posted.
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Monday, March 13th, 2017 AT 12:09 PM

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