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Man TGA 18.413: Troubleshooting EBS 03293-00 & FFR 03179-08 Errors - Modulator or ALB Sensor?

KrzysiekGrd 16683 13
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  • #1 17143475
    KrzysiekGrd
    Level 10  
    Posts: 17
    Rate: 7
    Hello Users.
    I have a problem with errors:
    EBS 03293-00 and FFR 03179-08.

    I will describe the problem from the beginning. The car had a faulty EBS when it was purchased. The main error was 03290 which is no can communication. After checking the beam from the modulator to the ecu ebs, it turned out to be operational, so the decision was made to replace the rear axle modulator. After the replacement, it seemed that everything was fine because the indicators on the clocks, i.e. the red exclamation mark and yellow ABS, went out. But when you press the brake sometimes error EBS 03293-00 and FFR 03179-08 pops up and Ebs stops working. Sometimes it helps to put the car out and start it.
    My question is whether there is a faulty regenerated modulator or stick to the air pressure sensor in the pillow (ALB) or the installation from it to the modulator.
    It is a solo with a weight of 18 tons.

    I am asking for suggestions because I have no ideas anymore.
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  • #2 17144100
    darfur5
    Level 35  
    Posts: 2110
    Help: 266
    Rate: 1695
    EBS 03293 00; protection against high pulse frequency, outlet valve active, pressure
  • #3 17144458
    KrzysiekGrd
    Level 10  
    Posts: 17
    Rate: 7
    darfur5 wrote:
    EBS 03293 00; protection against high pulse frequency, outlet valve active, pressure
  • #4 17144750
    darfur5
    Level 35  
    Posts: 2110
    Help: 266
    Rate: 1695
    More like a sensor, although it may turn out to be green under the plug :D
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  • #5 17145121
    KrzysiekGrd
    Level 10  
    Posts: 17
    Rate: 7
    darfur5 wrote:
    More like a sensor, although it may turn out to be green under the plug :D

    You will have to look there even though it is tight. I had to struggle a bit to replace the modulator. It is a solo with a fixed structure.
    Tell me how many more sensors are there? I know they are 3 pin. One 3-pin cube enters the modulator, I suspect from this sensor because the rest is from ABS sensors and pad wear and one from can. So it turns out that there is one sensor and I thought there are 2 left and right sides.
    This sensor is somewhere on the pillow or on the tekalan wire?
    Thanks in advance.
  • #6 17145410
    citromaniak
    Level 23  
    Posts: 700
    Help: 53
    Rate: 388
    There is only one sensor on the top of the pillow. The signal from 0.5v to 4.5v is to be depending on how the car is loaded. 24v or 5v power supply depends on the system
  • #7 17145450
    KrzysiekGrd
    Level 10  
    Posts: 17
    Rate: 7
    citromaniak wrote:
    There is only one sensor on the top of the pillow. The signal from 0.5v to 4.5v is to be depending on how the car is loaded. 24v or 5v power supply depends on the system

    Ok. Thanks for the info. So there is only one sensor for the rear axle. No 2 sensors for left and right side.
    So, as I thought, because only one cube comes from the pillow pressure sensor or to the modulator.
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  • #8 17146259
    Cobrat
    Level 22  
    Posts: 428
    Help: 35
    Rate: 499
    Sorry, I will cut in, but the ALB sensor is whacked with a different error code ... I will look for it, because I also had this sensor, but it did not flush or the abs did not shine ...
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  • #9 17146286
    KrzysiekGrd
    Level 10  
    Posts: 17
    Rate: 7
    Cobrat wrote:
    Sorry, I will cut in, but the ALB sensor is whacked with a different error code ... I will look for it, because I also had this sensor, but it did not flush or the abs did not shine ...

    I think ECAS 03151 or 03152 (left or right side) I do not have this error. But I know that EBS uses the ALB pressure sensor. The more loaded the vehicle, the greater the brake support force.
  • #10 17146312
    Cobrat
    Level 22  
    Posts: 428
    Help: 35
    Rate: 499
    EBS 03022 or 3 is the error number strictly from the ALB sensor. You can look there, check the ankle, unscrew the sensor itself, no problem, the last pillow on the right side (right, i.e. the passenger ;) ) between the frame and the wheel on the upper cushion base. The sensor itself fits P&P from Scania 4, the cost of the new 300 something, I do not remember exactly, and if not, then for a scrap and for a change, just do not overpay ;) .

    PS. Is the car a manual or an automatic machine?

    Below is a nice description of this sensor (quote from the translator):
    "ebs 03022 -00 incorrect axial load

    The braking systems of the previous generation were equipped with a pneumatically controlled brake force regulator (ALB - Automatisch Lastabhängiger Bremskraftregeleinrichtung, automatic brake force regulator operating according to the vehicle load)
    The regulators were controlled mechanically (pushed from the regulator to the bridge) or pneumatically (controlled from the suspension airbags).

    In electronic braking systems (directly in the EBS (knorr) 2 - 2.3 system) the LSV sensor (installed at the rear right (in the direction of travel) of the air cylinder) is used to calculate the braking forces depending on the vehicle load.
    In the sensor, various pressures (in the suspension airbags) are converted into electrical voltage signals.
    With these signal values, the brake pressure characteristic is correlated, according to which the EBS electronic unit regulates the pressure in the brake cylinder
    The error indicates a malfunction of this sensor (wiring, sensor itself ...)
    00 - the error is not defined
    The sensor can also "damage" - ie they produce incorrect signal values under all conditions. "
  • #11 17146327
    KrzysiekGrd
    Level 10  
    Posts: 17
    Rate: 7
    Cobrat wrote:
    EBS 03022 or 3 is the error number strictly from the ALB sensor. You can look there, check the ankle, unscrew the sensor itself, no problem, the last pillow on the right side (right, i.e. the passenger ;) ) between the frame and the wheel on the upper cushion base. The sensor itself fits P&P from Scania 4, the cost of the new 300 something, I do not remember exactly, and if not, then for a scrap and for a change, just do not overpay ;) .

    PS. Is the car a manual or an automatic machine?

    Below is a nice description of this sensor (quote from the translator):
    "ebs 03022 -00 incorrect axial load

    The braking systems of the previous generation were equipped with a pneumatically controlled brake force regulator (ALB - Automatisch Lastabhängiger Bremskraftregeleinrichtung, automatic brake force regulator operating according to the vehicle load)
    The regulators were controlled mechanically (pushed from the regulator to the bridge) or pneumatically (controlled from the suspension airbags).

    In electronic braking systems (directly in the EBS (knorr) 2 - 2.3 system) the LSV sensor (installed at the rear right (in the direction of travel) of the air cylinder) is used to calculate the braking forces depending on the vehicle load.
    In the sensor, various pressures (in the suspension airbags) are converted into electrical voltage signals.
    With these signal values, the brake pressure characteristic is correlated, according to which the EBS electronic unit regulates the pressure in the brake cylinder
    The error indicates a malfunction of this sensor (wiring, sensor itself ...)
    00 - the error is not defined
    The sensor can also "damage" - ie they produce incorrect signal values under all conditions. "

    So there is nothing else but to check the sensor and the installation from it. Thanks also for the help on the topic.
  • #12 17147425
    darfur5
    Level 35  
    Posts: 2110
    Help: 266
    Rate: 1695
    In the EBS5 and ECAS2 systems, the ALB is replaced with a pressure sensor installed in the upper part of the cushion base on the left-hand drive axle. The sensor cooperates with EBS, ECAS, FFR, thanks to which you can check the axle load on the display screen.
  • #13 17163719
    svavecone
    Level 25  
    Posts: 586
    Help: 73
    Rate: 452
    FFR 03179-08 ..... FFR controller complains about lack of information from EBS about the load of the vehicle, ALB sensor. But if there is no similar bug in EBS then don't bother with it.
    EBS 03293 error has a high priority and EBS does not send data with a lower priority, which is the vehicle load.
    Focus on the EBS ...... and this error, if the pressure indicators in circulation I and II are operational, unfortunately the damaged module has been hit.
  • #14 17203787
    KrzysiekGrd
    Level 10  
    Posts: 17
    Rate: 7
    svavecone wrote:
    FFR 03179-08 ..... FFR controller complains about lack of information from EBS about the load of the vehicle, ALB sensor. But if there is no similar bug in EBS then don't bother with it.
    EBS 03293 error has a high priority and EBS does not send data with a lower priority, which is the vehicle load.
    Focus on the EBS ...... and this error, if the pressure indicators in circulation I and II are operational, unfortunately the damaged module has been hit.

    Thanks for your interest and help. The problem solved itself. All these errors appeared after replacing the modulator. After resetting errors and driving for a long time, the problem does not occur and everything works as it should, regardless of whether the vehicle is loaded or empty. best regards
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Topic summary

✨ The discussion revolves around troubleshooting EBS error codes 03293-00 and FFR 03179-08 on a Man TGA 18.413 vehicle. The user initially faced a communication error (03290) and replaced the rear axle modulator, which temporarily resolved the issue. However, the EBS errors reappeared intermittently when braking. Participants suggested that the problem might stem from the ALB pressure sensor or its installation, emphasizing the importance of checking the sensor's functionality and connections. It was noted that the EBS system relies on the ALB sensor for load information, and if the EBS system is malfunctioning, it could prevent the FFR controller from receiving necessary data. Ultimately, after resetting the errors and extended driving, the user reported that the issues resolved themselves, indicating that the modulator replacement may have corrected the underlying problem.
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FAQ

TL;DR: Troubleshooting MAN TGA EBS 03293-00 and FFR 03179-08? The ALB/load sensor outputs 0.5–4.5 V, and "There is only one sensor." Focus checks on sensor, wiring, and modulator, then clear faults and road-test. [Elektroda, citromaniak, post #17145410] Why it matters: These codes can disable EBS; fast triage prevents unsafe braking and wasted parts.

Quick Facts

What does EBS 03293-00 mean on a MAN TGA?

It signals “protection against high pulse frequency, outlet valve active, pressure.” Check for abnormal valve actuation in the modulator. Inspect control and supply pressures, then command tests with your diagnostics tool. Address valve or control issues before chasing other subsystems. [Elektroda, darfur5, post #17144100]

What does FFR 03179-08 indicate, and how is it related to EBS?

FFR 03179-08 means the FFR is missing vehicle-load information from EBS. “EBS 03293 error has a high priority,” so EBS stops sending lower-priority load data. Fix EBS 03293 first; the FFR code clears once load messages resume. [Elektroda, svavecone, post #17163719]

Is this more likely the ALB/load sensor or the modulator?

When circuits I and II pressure indicators are OK, the EBS module is the fault path. As one expert put it, “unfortunately the damaged module has been hit.” Confirm supply pressures and run modulator tests before replacing sensors. [Elektroda, svavecone, post #17163719]

How many load/ALB sensors are on the rear axle, and where?

There is one sensor. It sits on the top of a rear air spring (pillow). That sensor feeds the system with the axle load signal used for brake force modulation. Inspect that single unit and its harness during diagnosis. [Elektroda, citromaniak, post #17145410]

What are the ALB sensor’s electrical specs?

The sensor outputs about 0.5–4.5 V depending on vehicle load. The supply is either 24 V or 5 V, depending on the specific EBS/ECAS implementation. These values help validate the sensor using a multimeter during load changes. [Elektroda, citromaniak, post #17145410]

Where exactly is the load sensor on TGA?

Look at the last rear air spring on the right (passenger) side. It is on the upper cushion base, between the frame and the wheel. You can access and remove it without special tools. [Elektroda, Cobrat, post #17146312]

How do I diagnose EBS 03293-00 quickly?

  1. Locate the rear load sensor and inspect the plug (“ankle”); clean or repair as needed.
  2. Confirm the sensor outputs a changing voltage as load varies.
  3. Swap in a known-good sensor (plug-and-play from Scania 4) and road-test. If unchanged, continue with modulator checks. [Elektroda, Cobrat, post #17146312]

Could a corroded connector cause intermittent EBS faults?

Yes. Corrosion can turn the connector “green under the plug,” causing unstable signals and intermittent EBS faults. Unplug and inspect the sensor and modulator connectors. Clean, dry, and reseal contacts before deeper parts replacement. This resolves many intermittent issues. [Elektroda, darfur5, post #17144750]

Which code points strictly to a faulty ALB sensor?

EBS 03022/03023 are ALB-specific. One description is “incorrect axial load.” Suffix 00 is undefined, but the sensor can “produce incorrect signal values under all conditions.” Check wiring, then replace the sensor if signals remain invalid. [Elektroda, Cobrat, post #17146312]

What’s a typical ALB sensor price and a compatible alternative?

A new sensor costs approximately 300 currency units. A plug-and-play alternative fits from Scania 4 series. This helps reduce downtime by using widely available parts. Verify connector and thread before installing. [Elektroda, Cobrat, post #17146312]

Do EBS, ECAS, and FFR share the same load signal?

Yes. In EBS5/ECAS2 configurations, the pressure sensor cooperates with EBS, ECAS, and FFR. The vehicle can display axle load information derived from this sensor on the dashboard. This confirms sensor health while driving. [Elektroda, darfur5, post #17147425]

What should I do after replacing the rear modulator?

Clear stored faults and perform an extended road test. In the referenced case, “after resetting errors and driving for a long time,” all errors disappeared and the system worked correctly. This verifies stable communication and pressure control. [Elektroda, KrzysiekGrd, post #17203787]

My warning lights go out, but 03293 returns when braking. Is that expected behavior?

It can happen during intermittent faults. After installing a modulator, lights may clear, but braking can retrigger 03293. EBS can stop working until you cycle ignition. Address root causes to prevent recurrence. [Elektroda, KrzysiekGrd, post #17143475]

What does EBS 03290 indicate in this context?

EBS 03290 indicates no CAN communication. If you see this historic code, confirm network integrity before trusting load or pressure data. Resolve CAN issues to stabilize EBS diagnostics and performance. [Elektroda, KrzysiekGrd, post #17143475]

Does vehicle weight (e.g., 18‑ton solo) change the diagnosis?

The documented case was an 18‑ton solo. The diagnosis still focused on EBS faults, modulator function, and the single ALB sensor. Weight informs expected load signal but does not change the troubleshooting order. [Elektroda, KrzysiekGrd, post #17143475]

How does axle load affect braking support in EBS?

EBS uses the ALB pressure signal to scale brake assistance. “The more loaded the vehicle, the greater the brake support force.” Validate the sensor signal under different loads to confirm proportional response. [Elektroda, KrzysiekGrd, post #17146286]
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