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Renailt Trafic - Trafic indicator lights up on the board, which means what's

serwek 15921 17
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Why does the orange warning light come on and the engine suddenly rev up with no response to the accelerator on a Renault Trafic, and is it related to the LPG system?

The thread points to a fault-triggered limp/failsafe condition, so the first step is to read the car with a diagnostic computer because without it you are guessing [#16747369][#16747575] A likely cause mentioned was a malfunctioning gas injector or LPG rail, and the advice was to isolate the cylinder by clamping the gas hoses to find the one that does not change engine behavior [#16747525] The later diagnosis confirmed the main cause of the revving/no-throttle symptom was a leaking injection system on the rail [#16755201] The LPG misfire on one cylinder was caused by worn/damaged valves inside the gas strip/rail, which is the injector rail with pistons/valves, and the fix was to replace that blue Reg Fast rail [#16755201][#16755243][#16764810]
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  • #1 16747341
    serwek
    Level 25  
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    Hello
    At the beginning, please be understanding for naming and lack of professionalism, thank you! :-)

    The case concerns: Renault Trafic petrol 2.0 cmm + LPG, 2006.
    On the dashboard the orange indicator came on as in the photo below (first photo).
    (some heaters ...?)
    Renailt Trafic - Trafic indicator lights up on the board, which means what's
    I add that:
    - car stood in the parking lot about 14 days i. (two weeks)
    - after starting the car it works properly , you can add gas, etc. After a while, it suddenly starts to spin and the light comes on (picture). Then you cannot add gas, it does not respond to pressing the gas pedal. We have not noticed any time regularity or principle. when it occurs most often.
    - earlier (driver testimony) there were problems with LPG. They consisted in the fact that one cylinder did not work evenly.
    It worked unevenly (only on gas) but it was possible to go. RPM on petrol is approx.
    - after turning off the ignition (sometimes immediately, and sometimes some time), the car fires properly, the revolutions are then normal.
    - when this strange indicator appears (along with the engine revs), turning the ignition switch off and turning the controls to the state (before starting) can light up: "STOP" + this strange orange indicator + battery, the rest goes out.
    Please support!

    best regards
    "napkin"

    photo of this engine: ;) Renailt Trafic - Trafic indicator lights up on the board, which means what's , Renailt Trafic - Trafic indicator lights up on the board, which means what's
    photo of the correct rotation, without the mysterious indicator: Renailt Trafic - Trafic indicator lights up on the board, which means what's Renailt Trafic - Trafic indicator lights up on the board, which means what's
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    #2 16747369
    pirat662
    Level 1  
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    Renailt Trafic - Trafic indicator lights up on the board, which means what's
    The first and most important step is connecting to the computer :D
  • #3 16747386
    serwek
    Level 25  
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    Hello
    Thank you very much for the scan of the manual page with the indication! (a paw for a colleague up ;) )
    :) Of course, bringing the car to the site on a trailer would be a solution. :lol: However, we are at the Forum ... :roll: :)
    Before "what", on the social forum (Professionals) just like me, I offer advice, experience, selflessly produce in my industry, Elektrody.pl, , (only in a different branch) I would like to ask for answers from kind people regarding possible symptoms in such "natural circumstances" ;) .
    Maybe someone had a similar case?
    Any suggestions?
    Could it be related to the LPG installation?

    best regards
    "napkin" :)
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  • #4 16747405
    kilun1
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    Try to reset your computer somehow. Disconnect the battery, briefly put the clamps together to discharge the capacitors
  • #5 16747470
    serwek
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    kilun1 wrote:
    Try to reset your computer somehow. Disconnect the battery, briefly put the clamps together to discharge the capacitors

    After turning off the ignition and restarting the engine, the problem persists.
    I just went outside for a moment, run it, check this car. I ran without problems. Walked approx: 15 minutes on gasoline. At that time, I drove forward on 1, then backward on the reverse. Everything normal on gasoline. The exception is gas / lpg. As mentioned by the driver, after switching to LPG, as if he did not burn on one candle.

    best regards
    "napkin" ;)
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    #6 16747525
    ladamaniac
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    Nevertheless, without a diagnosis, it will be difficult for the tester to say anything. Perhaps one of the gas injectors is malfunctioning. If it does stick on one cylinder, tighten the gas hoses with forceps when working on gas. The cylinder with no difference in engine operation will be the most suspect.
  • #7 16747559
    serwek
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    ladamaniac wrote:
    ... Perhaps one of the gas injectors is malfunctioning. If it does stick on one cylinder, tighten the gas hoses with forceps when working on gas. The cylinder with no difference in engine operation will be the most suspect.


    Oh, that's something ... :)

    best regards
    "napkin" ;)
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  • #8 16747575
    ladamaniac
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    However, diagnostics with any tester would significantly narrow the field of operation. Not necessarily a service tester, sometimes an Elm327 interface and a free program on the phone are enough.
  • #9 16748173
    serwek
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    Hello
    I unscrewed the candles. One was sooty black. Surely she doesn't smoke?
    I moved one of the electromagnets of this candle from the gas strip to the place of another. I started the car. He was on gas for 3 minutes. I unscrewed the candles. This time (as expected) the second candle, the one with the suspicious electromagnet added, was sooty.
    Are there such faults? Does it mean that the next electromagnets (coils ...?) Will "rain" soon?
    Does such an electromagnet have a professional name? Can it be purchased (one item)?

    ("strip" of blue color)

    best regards
    "napkin" :)
  • #10 16748196
    sebap
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    Take out that damaged Reg Fast strip and put in a new one, it costs less than PLN 150.
  • #11 16748244
    serwek
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    sebap wrote:
    Tear out that broken strip Reg Fast and put in a new one, it costs less than PLN 150.

    Will it be something like this: AC STAG W01 Renailt Trafic - Trafic indicator lights up on the board, which means what's http://allegro.pl/ac-stag-w01-4-cylindrowa-2-ohm-listwa-wtryskowa-i6952555232.html
    or is it something like this: VALTEK 32 OMVL REG FAST DREAM XXI Renailt Trafic - Trafic indicator lights up on the board, which means what's
    http://allegro.pl/listwa-wtryskowa-valtek-32-omvl-reg-fast-dream-xxi-i6912740586.html

    Can one replace the other (alternately) without any attacks, additions ...?

    best regards
    "napkin" :)
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  • #13 16748262
    serwek
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    sebap wrote:
    Buddy, the first is a product AC , resistance 3om so he won't come. The second one has 3om resistance so it would fit but it's Valtek so don't worry about it.
    Look for such a blue strip https://www.google.pl/search?q=listwa+reg+fas...ed=0ahUKEwjb14Kxw-XWAhWLYB&QB14Kxw-XWAhWLYB62. You change it p & p and that's it.

    I'm sorry, Mr. Friend, I wanted to clarify because I don't know myself. Bar AC STAG W01 it's probably 2 ohms not 3, am i wrong ...?
    Are there any better replacements for the AC STAG W01?

    best regards
    "napkin" :)
  • #14 16748299
    sebap
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    Yes, 2om, he writes from the phone so it's a common mistake.
    Better than AC-W01 is, for example, AC-W02 but also has 2om, so tuning the installation will be necessary. After you buy a blue Reg Fast, you install it and go.
    BTW, do not quote the entire content of the previous post because it is an unnecessary mess.
  • #15 16749677
    genek1000
    Level 35  
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    serwek wrote:
    after starting the car, it works properly, you can add gas, etc. After some time it suddenly revs up and the light comes on (photo)

    Without a tester, it's a game called "I'm shooting blind" :D
    I shoot blind and I bet on a problem with the throttle (or the gas pedal) :D
    The same engine sits there and the same software as in Lagoon 2.
    Read the forums about Lagoon 2 and Throttle Failure Mode.
  • #16 16755201
    serwek
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    Welcome gentlemen
    Initial result of repairs:
    1. The reason for the phenomenon described above (entering the engine speed, without the possibility of adding gas + a strange spiral shining on the board) was a leaky injection system (on the "rail"). If only, time will tell ... you have to ride ;)
    2. The reason for not smoking on one LPG cylinder was worn (damaged) valves screwed into the gas strip. (vertical tubes with valves + springs / 2 pcs with 4)
    By the way, what did I notice? The more worn the "vertical valve", the louder something "ticks" when the engine is running on LPG.
    Again, sorry for the unprofessional vocabulary, I'm not from the auto-moto industry ;) , I want to graphically describe what I saw, necessarily in my own words.

    I would like to thank the honorable body for participating in the discussion, constructive ideas, and sharing :spoko: :)
    In return, I participate (as I can) in another section of the Forum / industry.
    I leave the topic temporarily open, exchanging information and impressions.

    best regards
    "napkin" :)
  • #17 16755243
    sebap
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    It is not a vertical valve but an injector piston. A working injector is ticking, a worn-out crush.
    What strip did you replace?
  • #18 16764810
    serwek
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    Hello
    On the same (blue)!

    best regards
    "napkin" ;)
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Topic summary

✨ The discussion revolves around a 2006 Renault Trafic petrol 2.0 CMM + LPG, which has an orange indicator light on the dashboard and experiences issues with acceleration after a period of idling. Users suggest connecting the vehicle to a diagnostic computer to identify potential faults, particularly with the LPG system. Symptoms include uneven cylinder performance and a sooty spark plug, indicating possible injector issues. Recommendations include resetting the vehicle's computer, checking gas injectors, and replacing faulty components such as the Reg Fast strip. The user reports that the problem was traced to a leaky injection system and worn valves in the gas strip, leading to a ticking noise when running on LPG.
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FAQ

TL;DR: 2 of 4 LPG injector valves were worn; "leaky injection system" triggered the orange coil light and throttle loss. The fix was replacing the blue Reg Fast rail. [Elektroda, serwek, post #16755201]

Why it matters: This FAQ helps Renault Trafic 2.0 petrol + LPG owners quickly diagnose throttle loss with the orange spiral light.

Quick Facts

What does the orange spiral/coil light mean on a petrol Trafic?

It signals an engine electronics fault/failsafe. In this case, a leaky injection rail triggered the light and removed throttle response until a restart. Fixing the leak and worn LPG injector parts resolved it. "Leaky injection system" was the confirmed cause. [Elektroda, serwek, post #16755201]

Why does my Trafic suddenly rev and ignore the gas pedal, then recover after a restart?

The ECU enters failsafe after detecting a fault, cutting throttle control and lighting the orange spiral. A restart clears the state briefly. In the documented case, a leaking petrol injection rail caused the episodes until repaired. [Elektroda, serwek, post #16755201]

What’s the first step to diagnose this—can I do it at home?

Connect to the car with a scan tool. "The first and most important step is connecting to the computer." Even basic OBD checks can narrow faults before parts swapping. [Elektroda, pirat662, post #16747369]

Can I use an ELM327 Bluetooth adapter and a phone app for codes?

Yes. A simple ELM327 interface with a free smartphone app can read and clear basic OBD codes on this Renault platform, helping you pinpoint throttle or fueling faults. [Elektroda, ladamaniac, post #16747575]

Could the LPG system cause a single-cylinder misfire on gas?

Yes. A sticking or weak LPG injector can make one cylinder run unevenly on gas. You can identify it by temporarily clamping each injector’s hose; the cylinder with no change is suspect. [Elektroda, ladamaniac, post #16747525]

How do I isolate a bad LPG injector quickly?

  1. Warm engine and switch to LPG.
  2. One by one, gently clamp each injector hose with pliers.
  3. The cylinder that shows no change when clamped points to the faulty injector. [Elektroda, ladamaniac, post #16747525]

What is the “Reg Fast” blue rail?

It’s a blue LPG injector rail assembly used on many retrofits. In the thread, replacing the worn Reg Fast rail restored proper running. It installs plug‑and‑play on like-for-like setups. [Elektroda, sebap, post #16748250]

How much does a new Reg Fast rail cost?

Approx. under PLN 150 for a new unit, based on user purchase guidance in the thread. Prices vary by seller and region. [Elektroda, sebap, post #16748196]

Can I swap an AC STAG W01 rail for a Reg Fast without retuning?

No. AC‑W01 and AC‑W02 injectors are 2 Ω types. Switching from a different‑spec rail usually requires LPG ECU calibration to match flow and response. "Better than AC‑W01 is AC‑W02 but also has 2Ω." [Elektroda, sebap, post #16748299]

What exactly was faulty here—what part name should I use?

The user called them “vertical valves,” but the correct term is injector pistons inside the LPG rail. "A working injector is ticking, a worn‑out [one] crush." Replacing the blue rail addressed the wear. [Elektroda, sebap, post #16755243]

Will disconnecting the battery or key‑cycling fix the issue?

It may reset symptoms briefly but does not fix underlying faults. The car repeatedly recovered after restarts, yet the problem returned until the leaking rail and worn injectors were replaced. [Elektroda, serwek, post #16747470]

What spark‑plug signs point to a faulty LPG injector?

A sooty black plug on one cylinder after running on LPG suggests that injector is over‑fueling or sticking. Swapping the suspect injector’s coil position moved the fouling to another plug, confirming the fault. [Elektroda, serwek, post #16748173]

Could the throttle body or pedal cause similar symptoms?

Yes. A throttle or pedal fault can trigger a failsafe mode with throttle loss, seen on similar Renault engines (e.g., Laguna II). Always confirm with a scan. [Elektroda, genek1000, post #16749677]

After replacing the rail, do I need LPG calibration?

If you fitted the same blue Reg Fast rail, it’s typically plug‑and‑play with no major retune. Mixing different injector types generally requires adjustment. [Elektroda, sebap, post #16748250]

What does ELM327 stand for?

ELM327 is a common OBD‑II interpreter chip/protocol used in inexpensive adapters. It lets phone apps read engine data and fault codes over Bluetooth. [Elektroda, ladamaniac, post #16747575]

Which Trafic and setup does this FAQ target?

Renault Trafic petrol 2.0 (2006) with LPG conversion, showing an orange spiral light and intermittent throttle loss after idling. [Elektroda, serwek, post #16747341]
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