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Disco 4 (LR4) 3 fault codes

Discussion in 'Land Rover Discovery' started by Grrrrrr, Oct 19, 2017.

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  1. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    Hi there,

    My mate with the Disco 3 upgraded to a Disco 4. And, of course, it has a niggle. The check-engine light sometimes flashes up. If I clear the codes it is OK for a week or so and then it does it again and the same 3 codes return.

    Is there anything that connects these 3 codes?

    Cylinder 2 Injector Circuit Low
    Water in Fuel Sensor Circuit
    Evaporative Emission System Leak Detection Pump Control Circuit/Open

    The first one seems to imply an issue with the injector, possibly low volts. He's cleaned all connections and i all looks fine though. What beats me is how the others could be triggered at the same time ... unless they all share the same relay / fuse in the fusebox?

    I don't think you can get RAVE for the Disco 4? Is it just the online Topix thing?
     
  2. johnlad

    johnlad Well-Known Member

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    could try a new fuel filter as they can cause some fault codes
     
  3. sierrafery

    sierrafery Well-Known Member

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    What year and what engine?
     
  4. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    Yes, just logging back in to add that as I realised I hadn't said. I am so bl**dy tired and now I've got to go out and fix a leak at someone's house.

    It is a 3.0 diesel on a 2012 plate.

    Back in a few hours although frankly I think I'll drop straight into bed.

    ANd yes, told him to try the fuel filter as they're only a fiver or so. Hopefully that might cut it. He's off to Wales tomorrow so I hope so!
     
  5. lynall

    lynall Well-Known Member

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    Drain the water out of the fuel filter drain point, but if its got enough water in to trigger the sensor you have to ask when was it last changed?
    Think theres some sort of recall for evap pipework on the D4 turbo related possibly?
     
  6. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    Fuel filter not expensive and unknown when last changed so replaced yesterday. He's off for a week now so we'll see if that fixes it.

    There's some sort of recall on the evap emission system? Be interested in more details on that if anyone has them.

    Evap emission system normally to do with fuel vapours and venting tank when filling so not normally associated with Turbos but I've never played with a D4 before and have got no manual so no idea where they've hidden it or what it is hooked up to.
     
  7. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    UPDATE

    A new fuel filter and new battery and off he went ... for 10 miles. Yellow light followed by a red triangle and limp mode home! Packed kids and gear into his Golf and set off for Wales. So, not a happy bunny with the Disco.

    Will have a look when he gets back and see what codes are stored.
     
  8. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    UPDATE

    Mate got back last night so we read the codes again. A few extra new ones. We cleared them but the extra ones returned, although they might be being caused by the initial issue? Could really do with undrstanding what links all these. BY the way, it does smell a little of unburnt fuel at the exhaust. Dodgy #2 injector or the wiring to it? Does the wiring share anything in common with the other faults? In REVERSE DATE order ...

    Codes that reappeared after clearing (20181025). These ones cause limp mode (red). Seen before, see below.

    MAP - Mass or Volume Air Flow Correlation
    O2 Circuit Range / Performance (Bank 1, Sensor 1)


    Codes from last weekend (20181021).

    HO2S Heater Resistance (Bank 2, Sensor 2)


    https://www.obd-codes.com/p0060
    If your OBD-II equipped vehicle has stored a code P0060, it means that the powertrain control module (PCM) has detected a malfunction in the heater circuit of the downstream (or pre catalytic converter) oxygen (O2) sensor for engine bank one. Bank 2 indicates the malfunction involves the bank of the engine that doesn't contains cylinder #1. Sensor 2 means that the problem is related to the downstream sensor.

    MAP - Mass or Volume Air Flow Correlation

    https://www.yourmechanic.com/articl...r-volume-air-flow-correlation-by-logan-utsman
    The most common causes for a P006A are:
    Aftermarket air intake systems
    Dirty MAF or MAP sensor
    Faulty MAF or MAP sensor
    Faulty engine computer

    HAD THESE NEXT 3 CODES BEFORE (SEE BOTTOM)

    Cylinder 2 Injector Circuit Low
    Water in Fuel Sensor Circuit
    Evaporative Emission System Leak Detection Pump Control Circuit/Open


    O2 Circuit Range / Performance (Bank 1, Sensor 1)

    https://www.obd-codes.com/p2a00
    In my experience, when an OBD-II equipped vehicle has stored a P2A00 code, it means that the powertrain control module (PCM) has detected a malfunction in the upstream (or pre catalytic converter) oxygen (O2) sensor or circuit. Bank 1 denotes the bank of the engine that contains the number one cylinder and Sensor 1 indicates that the malfunction is related to the upstream sensor.

    FROM JAGUAR JTIS manual for 2004 S-type (same engine in same orientation?)

    The 2.5 and 3.0 litre 24 valve V6 engine has four overhead camshafts and are driven by two timing chains. The engine incorporates electronic engine management with distributorless ignition system, sequential electronic fuel injection. It also has two catalytic converters in the exhaust system which includes two oxygen sensors and two catalytic monitor sensors.Viewed from the driving position, the right-hand cylinder bank is numbered 1 to 3, from the front of the vehicle and the left-hand cylinder bank are numbered 4 to 6, from the front of the vehicle.

    OLD FAULT CODES (20181018)

    Cylinder 2 Injector Circuit Low

    https://www.obd-codes.com/p0264

    Water in Fuel Sensor Circuit

    Seems to be caused by low voltage.

    https://www.yourmechanic.com/articl...e-water-in-fuel-sensor-circuit-by-jay-safford

    Evaporative Emission System Leak Detection Pump Control Circuit/Open

    https://www.yourmechanic.com/articl...ection-pump-control-circuit-open-by-evan-clay

    More info here: http://www.rangerovers.net/forum/6-...m-leak-detection-pump-sense-circuit-high.html

    And here.

     
  9. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    @Saint.V8 , how similar is the LR4 to the L322? Any ideas?
     
  10. Saint.V8

    Saint.V8 Dyed-in-the-wool 100% RR Junkie

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    Mostly different, shares some of the data systems, but not huge amount else.
     
  11. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    Bugger!
     
  12. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    UPDATE

    Replacement fuel filter was leaking. Seems the after-market ones often leak so it has to be a Land Rover one.

    The main issue appears to be the manifold. Definitely leaking so looks like some fairly major surgery required. Moreover it looks like one of the heads has been off before so someone has been here before. This isn't looking good.:eek::eek::eek:
     
  13. lynall

    lynall Well-Known Member

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    Delphi fuel filters are very good.
     
    Grrrrrr likes this.
  14. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    UPDATE.

    Fuel filter replaced with a genuine Land Rover one (much better) and the manifold has been replaced. Driving beautifully but my mate has been in contact and apparently the yellow light has come on again. It is fixed by taking the fuel cap off! Apparently whenever you take the fuel cap off there is a hiss of pressure releasing. Seems a bit odd? Can someone explain how this evaporative pump thing works? It was saying "Evaporative Emission System Leak Detection Pump". What is it connected to? How does it work? Why is the tank pressurising? Would putting a loose filler cap on be a reasonable (cheap) solution?!
     
  15. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    Just watched that again. So it looks like a pipe is blocked or the vent solenoid valve is dead ... or maybe the purge solenoid. The purge solenoid connects to the inlet manifold, that makes sense.
     
  16. td5driver

    td5driver Active Member

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    sounds like nackard air flow maf metter and turbo boost leak
     
  17. lynall

    lynall Well-Known Member

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    I could be wrong here but I thought the evap system kept the tank under a vacuum so all the fuel vapour got burnt in the engine
    We have had a few petrol cars and you could hear their evap solenoids clicking all the time the engine was running, but have no experience of diesels with evap.
     
  18. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    That makes sense to me. The manifold should cause a vacuum to suck the hydrocarbons out of the purge valve.

    Saw my mate last night in the pub and he said he had trouble filling up the tank! Golden bit of information. So I'm guessing it is the vent valve that goes to atmosphere. Or maybe both vent and purge. He's bringing it round later for me to read the codes but pretty sure I'll see EVAP. I'm pretty certain I know the area I am looking at now, just a case of getting to it. I guess I could just leave the event pipe off and see if that cures it!
     
  19. lynall

    lynall Well-Known Member

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    The vast majority of the time the manifold will be under pressure from the turbocharger.

    On my wifes audi the crankcase breather dumps its oily mist into the inlet tract right before the turbo, I dont know if its the same on the D3/4 but would make sense
     
  20. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    I've read the codes. Exact same 3 we got before the manifold was replaced. That #2 injector one is worrying me as I hoped that would vanish with the manifold fix. Weird thing is that it purrs like a cat. The engine is so smooth and quiet it is unreal. I wish my P38 oil burner was as smooth and quiet!

    The 3 fault codes I have are:

    Cylinder 2 Injector Circuit Low
    Water in Fuel Sensor Circuit
    Evaporative Emission System Leak Detection Pump Control Circuit/Open

    So I am back where we started: wondering what connects the 3 and wondering is there is a common cause. I opened the fuel cap and I'd say it was more of a suck noise than pressure coming out - so I think that is right. I think we'll start with the vent valve. Given he cannot get fuel in that seems to be a good place to start. Assuming we cannot fix it a new one of them is a darn sight cheaper than an injector.
     
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