Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: Intermittent fuel injector errors - TDV6 3.0

  1. #1
    Join Date
    Jun 2016
    Location
    Carnegie, VIC
    Posts
    42

    Post Intermittent fuel injector errors - TDV6 3.0

    Last week, my 2014 Disco TDV6 3.0 suddenly started to run rough over the last km or so on my way home. It felt like the engine was misfiring (it's been smooth as silk for the past 206,000km). I made it home without incident, and the next time I drove it, it was back to its usual smooth self.

    Today after approx 50km it did it again, and I pulled over and switched off for a while. Next start, it shut itself down immediately with an engine fault:
    P062D-11 (AF) Fuel injector driver circuit performance - bank 1 - General electrical failure - circuit short to ground

    I cleared the fault (IID GAP tool is always plugged in...), and tried again - engine started and ran perfectly. I drove to my next job 80km away without an issue.

    The next startup an hour later was fine, but as soon as I reversed onto the road, the engine shuddered and stopped with another fault light. This time the fault was:
    P0261-00 (AC) Cylinder 1 injector circuit low

    I cleared this fault, the engine started fine and didn't miss a beat for my remaining 3x trips for the day, around 100km all up.

    Does anyone have any advice on what I could check? There are no signs of leaks near any of the injectors. Are there any electrical plugs I could check or clean, or does this sound like an imminent injector failure? The vehicle runs perfectly and has plenty of power apart from these 3x brief moments.

  2. #2
    Join Date
    Sep 2014
    Location
    Baldivis WA
    Posts
    952
    Sounds like you need the injectors tested for flow. Sounds like #1 is reaching the limits of serviceability.

    They do wear over time and the ecu can only compensate fuelling for them so much out of the trim tables. Issue is they are normally not serviceable if worn, the tolerances are too fine.
    Good thing is they are not too dear, from the uk about 260 - 300 aud each. Problem is your best off replacing all 6 at the same time, but they do come with new fuel pipes and crush washers.

  3. #3
    Join Date
    Nov 2014
    Location
    Nirvana near Albany W.A.
    Posts
    1,740
    check the wiring from number 1 injector ( including connector) through to the ECU , for chafing or bad connections

  4. #4
    Join Date
    Jun 2016
    Location
    Carnegie, VIC
    Posts
    42
    Thanks for the responses guys!

    I've never had an injector fail before, so I'm not sure if my symptoms clearly point to the injectors themselves. I would have thought a worn injector would cause a decrease in performance until it eventually fails completely...? I can't seem to find any live values to monitor for the injectors with the GAP tool.

    My suspicion at this stage is a faulty connection - either damaged wiring or a dirty plug connection. The engine runs perfectly most of the time, but when the problem occurs it is obvious. I've only had this issue pop up 6 times now over the past week. The last couple of times it happened as I was about to reverse into a parking spot - engine was running smoothly until I selected reverse gear. Immediately I could feel the engine stutter and misfire. Idle went back to normal if I selected P, N, or D, but the misfire returned each time I selected Reverse...!? The engine cut out as soon as I tried to actually move in Reverse, then it wouldn't start at all (after resetting the fault it would start, idle rough for half a second then shut down again). I repeated this 3 or 4 times before I gave up, popped the hood, removed the engine cover and inspected the wiring loom from injector 1, around the back of the engine to where it disappears through the battery box on its way to the ECU. No sign of any damage I could see, but after disturbing the wiring loom the engine started and ran smoothly for the next day and a half.

    I'll try to find time over the weekend to disconnect a few things so that I can inspect the loom more closely (otherwise I'll surely be doing it in the emergency lane of the freeway in the pouring rain when it fails next:-). I'll update this thread if I find anything, or if it ends up in a workshop getting injectors replaced.

    Another point I should add is that I had the inlet manifold replaced on this side around 6 weeks ago by my local indie, but I've covered plenty of trouble free Km before this issue arose last week.

  5. #5
    Join Date
    Nov 2014
    Location
    Nirvana near Albany W.A.
    Posts
    1,740
    when you're parked in your drive with engine running in park , give the harness a wiggle till you find the bad connection.
    If its an easy fix do it then.
    If it's not , take it back to Indy
    .

  6. #6
    Join Date
    Sep 2014
    Location
    Baldivis WA
    Posts
    952
    Perhaps a long shot, but have you ever had the transmission serviced? This could be a sign of a partially blocked reverse gear solenoid. In the transmission, there's a bank of solenoids, one for each gear. These talk to the engine ecu via the transmission ecu or "mechatronic", also in the transmission. Is it selecting gears smoothly or with a bit of a clunk?

    If it cant select a gear properly, this maybe confusing the ecu as to what fuelling to provide, and appear as an injector issue.

    A suggestion would be to put it in "sport" mode and drive it briskly (but safely of course) with a heavier right foot, the mechatronic is adaptive to how you drive, and it does get "lazy" from time to time. Harsh shifts or flaring (engine revs increase between shifts) from gear to gear are signs that a transmission valve body and fluid change are needed.

    Like I said, a long shot if the injector loom etc doesn't show any damage.

  7. #7
    Join Date
    Jun 2013
    Location
    NSW Australia
    Posts
    568
    So.... When I changed my inlet manifolds my D4 3L refused to leave the shed. I end up having to change the plug on the fuel rail sensor, and then the sensor itself.

    Then to make it worse, the ECU logged a circuit driver fault and wasn't supplying power to the turbo actuator sensor. I finally diagnosed it as a engine ECM and bought a new second hand one for Cambo @old Jaguar to flash. I plugged the new ECM in and the fault was gone and power returned, Just before I set off for he's house cam said. Just plug the old one back in.. for no reason at all it was now wiring again and has worked ever since. I was able to return the ECM. I am an Auto electrician and had rechecked everything thinking there was no way for a failed ECM after a manifold change. I admit I was hard on the plug for the rail sensor which I had to change and maybe dropped the rail and damaged the sensor. But not the turbo wiring or ECM.

    Happy to take a call later if you need anything cleared up.

    My phone put this in the wrong post earlier, oops
    If at first you do not succeed, maybe your just no good and should quit!

  8. #8
    Join Date
    Jun 2016
    Location
    Carnegie, VIC
    Posts
    42
    Thanks again for the responses. FYI - transmission service was carried out 3 months ago, but thanks Eric for the suggestion.

    I spent a few hours wiggling, jiggling, disconnecting and inspecting as much of the wiring loom as I could access, but again found nothing obvious, and couldn't get the misfire to return.

    I measured resistance of all bank 1 injectors, all look good at around 170kohms (service manual says 150-250K). Eventually I gave up and put everything back together, and the vehicle drove superbly for the next few days...

    ...until I was 3/4 of the way around a roundabout, and without a hint of warning the engine cut out completely. Sudden loss of power steering and brake boost almost had me mowing down pedestrians on the footpath, but I managed to wrestle the steering and roll to a halt, blocking the exit of the roundabout! I quickly fired up the GAP app and confirmed it was the original fault that had cut out the engine:
    P062D-11 (AF) Fuel injector driver circuit performance - bank 1 - General electrical failure - circuit short to ground

    I cleared it, but it returned twice more on the short drive home, cutting the engine and rolling to a stop each time. I eventually managed to limp it around the corner to my local indie workshop, the mifire almost permanent now (at least when reverse is selected...) They have confirmed that it's not the injectors (swapped in a couple of new ones to test, but fault still occurs), and have checked and tested the loom, but it all measures OK. A final test was a temporary swap of the ECM from a donor vehicle, and the problem disappeared. Swapped mine back in and the misfire returned straight away. LR have one in stock, so I've given the go ahead for them to order it in and it will hopefully arrive to be fitted sometime on Monday.

    I've got my fingers (and wallet...) crossed in the hope that this is the last I see of these fault codes!

  9. #9
    Join Date
    Jun 2013
    Location
    NSW Australia
    Posts
    568
    I got one from all 4x4 Kotara. Was very well priced. They waved the restocking fee from memory which I was happy to pay. I bought some other gear at the same time. Maybe that helped. What's the Ecm worth
    If at first you do not succeed, maybe your just no good and should quit!

  10. #10
    Join Date
    Jun 2013
    Location
    NSW Australia
    Posts
    568
    PS I wish yours came back to life like mine did!!
    If at first you do not succeed, maybe your just no good and should quit!

Page 1 of 2 12 LastLast

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Search AULRO.com ONLY!
Search All the Web!