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Renault Megane Scenic 1998 2.0 Engine: Persistent ABS Warning Light Despite Sensor Maintenance

AZUKS 22335 12
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  • #1 16816096
    AZUKS
    Level 16  
    Posts: 773
    Rate: 311
    I found a lot of topics about ABS, but I did not find what I'm interested in. Applies to the Renault Megane Scenic 1998 engine 2.0
    In order to avoid unnecessary advice and questions, I would like to point out that I cleaned all connections on wires and cubes, the continuity of wires is maintained, the sensors have a resistance of >= 1050 ohms. I was with a friend who has a computer for Renault and erased my mistake, but after driving a few kilometers again, the control light came on, the information popped up that there is a problem with the rear sensors, no indication whether it was left or right.
    All this failure began when I damaged the rear left brake cylinder, where the replacement of this cylinder could have contributed to this failure?
    - soiling the sensor with brake fluid and other dust,
    - aeration of the system, although I vented it and braked evenly, I checked the review.
    I am asking for advice.
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  • #2 16816398
    leonek4
    Level 29  
    Posts: 1344
    Help: 104
    Rate: 636
    And what exactly did the computer show? Error number?
  • #3 16817141
    AZUKS
    Level 16  
    Posts: 773
    Rate: 311
    leonek4 wrote:
    And what exactly did the computer show? Error number?

    There was a code, but I do not remember, it was written that the problem with the back, without pointing to the right or left side.
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  • #4 16817211
    ALIBABA I
    Level 33  
    Posts: 2571
    Help: 217
    Rate: 528
    AZUKS wrote:
    information pops up that there is a problem with back sensors, no indication whether it is left or right.
    Well, it's a reno comp.
    AZUKS wrote:
    There was a code but I do not remember
    Hm.
    AZUKS wrote:
    All this failure started when the brake cylinder left my back,
    So start from this circle
  • #5 16832317
    AZUKS
    Level 16  
    Posts: 773
    Rate: 311
    I cleaned the sensors and the rings in both wheels and nothing.
    The colleague had an old computer and after connecting it shows the error of the rear wheels and the left rear wheel while driving does not show the speed, you can not delete the error. Does anyone know which pins in the plug of the ABS pump are responsible for which wheels? I want to rule out the lack of continuity of wires to this wheel.
  • #6 16832939
    Daro122
    Level 31  
    Posts: 1343
    Help: 165
    Rate: 747
    Left front 3 and 18
    right front 1 and 17
    left rear 14 and 21
    right rear 5 and 13
  • #7 16834398
    diablo23248
    Level 28  
    Posts: 924
    Help: 102
    Rate: 612
    If the sensor does not show speed, and there are no errors at the stop, the options are two:
    1. Damaged sensor core
    2. Too large distance between the sensor and the polarizing wheel
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  • #8 16839856
    AZUKS
    Level 16  
    Posts: 773
    Rate: 311
    Daro122 wrote:
    Left front 3 and 18
    right front 1 and 17
    left rear 14 and 21
    right rear 5 and 13

    There are three rows of pins in the plug and they have no descriptions, can you write to your friend how to tell which pin has the number?

    Added after 1 [minutes]:

    diablo23248 wrote:
    If the sensor does not show speed, there are no errors at a standstill

    But there is a mistake at the stop and it can not be deleted.
  • Helpful post
    #9 16839937
    kaza12
    Level 10  
    Posts: 28
    Help: 1
    Rate: 7
    AZUKS wrote:
    there is a mistake at the stop
    wires
  • #10 16839963
    AZUKS
    Level 16  
    Posts: 773
    Rate: 311
    kaza12 wrote:
    AZUKS wrote:
    there is a mistake at the stop
    wires

    That's why I need pin identification in the plug to check the continuity of the ABS pump.
  • Helpful post
    #11 16840271
    Daro122
    Level 31  
    Posts: 1343
    Help: 165
    Rate: 747
    Undress the plug and you will find descriptions.
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  • #12 16844636
    KrzysiekBTW
    Level 8  
    Posts: 9
    Rate: 3
    Thoroughly check if the abs crown is damaged
  • #13 16864638
    AZUKS
    Level 16  
    Posts: 773
    Rate: 311
    Failure removed, the plug in the middle was like new, but the wires reaching it no longer. The break was on the wire to the left rear wheel.
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Topic summary

✨ The discussion revolves around a persistent ABS warning light issue in a 1998 Renault Megane Scenic with a 2.0 engine. The user has already cleaned all connections, ensured wire continuity, and confirmed sensor resistance is adequate. Despite erasing the error codes with a diagnostic tool, the warning light reappears, indicating a problem with the rear sensors. The issue began after replacing a damaged left rear brake cylinder, raising concerns about potential contamination of the sensor or air in the brake system. Participants suggest checking the ABS sensor connections, identifying pin assignments for the ABS pump, and inspecting the ABS crown for damage. Ultimately, the user resolved the issue by discovering a broken wire leading to the left rear wheel.
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FAQ

TL;DR: Root cause was simple: 1 broken wire to the left-rear ABS sensor. “The break was on the wire to the left rear wheel.” [Elektroda, AZUKS, post #16864638]

Why it matters: This FAQ helps Renault Megane Scenic 1998 owners fix persistent ABS lights without replacing good sensors.

Quick Facts

How do I fix a persistent ABS light on a 1998 Renault Megane Scenic after brake work?

Start at the wheel you serviced. Inspect the sensor, ABS ring, and especially the harness to that corner. The forum case ended with a single broken wire to the left-rear sensor being repaired, clearing the fault permanently. “The break was on the wire to the left rear wheel.” [Elektroda, AZUKS, post #16864638]

My scanner only says “rear sensors fault” without left/right—what should I check first?

Check the wiring to both rear sensors. Community guidance shows that ambiguous rear faults often trace to a harness break rather than the sensors. In the documented case, repairing the left-rear sensor wire resolved the persistently returning ABS light. [Elektroda, AZUKS, post #16864638]

Can a leaking rear brake cylinder cause an ABS sensor fault?

Yes, it can contribute indirectly. Focus diagnostic steps on the serviced rear wheel first. Fluid, dust, or mechanical disturbance may affect the sensor or ring. The thread’s advice was clear: “So start from this circle,” meaning the wheel where the cylinder failed. [Elektroda, ALIBABA I, post #16817211]

What are the ABS pump connector pins for each wheel on this model?

Use this map for continuity checks: left front 3 and 18; right front 1 and 17; left rear 14 and 21; right rear 5 and 13. This lets you meter each sensor from the pump plug without guesswork. [Elektroda, Daro122, post #16832939]

How can I tell if my issue is wiring or a bad sensor?

If the fault is present even with the car stationary, check the harness first. A standing fault often indicates open circuit or short, not a speed-detection problem. One expert’s concise verdict here was “wires,” which proved correct in the case. [Elektroda, kaza12, post #16839937]

Scanner shows zero speed from the left-rear wheel while driving—what next?

Meter continuity from the ABS pump pins to the left-rear sensor. If wiring passes, inspect sensor air gap and the ABS ring for damage. The case thread noted the left-rear showed no speed and the fault couldn’t be cleared until wiring was fixed. [Elektroda, AZUKS, post #16832317]

What’s a quick 3-step method to test rear wheel-speed wiring from the ABS pump?

  1. Unplug the ABS pump and identify LR pins 14 and 21.
  2. Measure resistance through the LR circuit; compare to the other side.
  3. If open or erratic, trace and repair the break along the LR harness. [Elektroda, Daro122, post #16832939]

What is an ABS ring (tone wheel) and why does it fail?

It’s a toothed wheel the sensor reads to calculate speed. Corrosion, cracks, or debris increase the gap or break the signal. A damaged ring was highlighted as a must-check item for persistent faults in this platform. [Elektroda, KrzysiekBTW, post #16844636]

What sensor resistance should I expect when testing?

Typical reading reported by the OP was at least 1050 Ω per wheel sensor. Large deviation or an open circuit suggests wiring or sensor failure. Use consistent meter setup and compare left vs. right for clarity. [Elektroda, AZUKS, post #16816096]

Why does the ABS light return after clearing codes and a short drive?

The controller re-runs plausibility checks once the wheels turn. If a wheel provides no or inconsistent signal, the fault re-sets. In the thread, the light reappeared after a few kilometers due to a broken left-rear sensor wire. [Elektroda, AZUKS, post #16816096]

I can’t delete the ABS error even at a stop—what does that imply?

A non-clearable fault at standstill points to a hard failure, usually wiring or connector damage. In this case, repair of the left-rear sensor wire finally allowed the code to clear and stay off. [Elektroda, AZUKS, post #16839856]

How do I identify pin numbers on the ABS plug without labels?

Disassemble the connector shell. The numbering is molded into the plastic inside. One expert tip: “Undress the plug and you will find descriptions.” That enables accurate continuity tests per wheel. [Elektroda, Daro122, post #16840271]

Could cleaning sensors and rings be enough to fix the issue?

Cleaning helps if debris or fluid contamination caused weak signals. However, if the fault persists at rest, inspect wiring. The OP cleaned both sides, yet only repairing the left-rear wire solved the returning light. [Elektroda, AZUKS, post #16832317]

What is a wheel-speed sensor and how does the gap affect it?

It’s a magnetic pickup that detects ring teeth passing by. Too large an air gap or a damaged core prevents signal generation. As one expert wrote, failures come from a “damaged sensor core” or excessive gap. [Elektroda, diablo23248, post #16834398]

Edge case: my tool is old and shows only generic rear faults—how do I localize?

Use live data for each wheel’s speed while driving slowly. The dead channel reveals the corner. The thread used an older scanner, saw no left-rear speed, then confirmed and repaired the left-rear harness. [Elektroda, AZUKS, post #16832317]
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