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      TIPS & FEATURES AEuro-Forum - READ!!   10/25/2016

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            which also adds "Pragma: no-cache". Chrome does a normal "If-modified-since" and Opera ignores the key. 11. InfoServer 1 and VMDiagnostics Server InfoServer 1 and VMDiagnostics are already in progress, as InfoServer 1 will be comprised of the following Technical
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      b. BMW
      c. Mini Cooper
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      yesterday 10/24/2016.  Stay Tuned!!
Michael Roberts

ABC C1525-1 / C1525-2 / C1525-32 / C1526-64

31 posts in this topic

VIN: WDBPJ75J93A037115
Production Month / Vehicle Year: March / 2003
Make: Mercedes Benz
Model: CL500
Engine: 5.0L,V8 (303CI) 113.960
Transmission: Automatic 5-Speed 5 speed Automatic 722.620
Mileage: 70026
Affected System: Chassis / Suspension / Brakes Suspension / Auto-Leveling
Description of Issue: INOP / Intermittent
Scan Tool: Autel
Diagnostics / Tests Performed:

Customer came in with a leaking p/s pump and low on fluid.

Found the following code(s)....

C1525-64 System pressure too low Stored
C1526-16 Fault in pressure supply Stored

Replaced pump and cleared code(s).

The vehicle is sitting on the floor and raised initially, but after attempting to run the suspension
adaptation I have the following code(s)....

ABC-ABC active body control
C1525-1 Left front critical vehicle level Stored&Current
C1525-2 Right front critical vehicle level Stored&Current
C1525-32 Calibration of the plunger travel sensors is not successfully carried out. Stored&Current
C1526-64 Load adjustment is not successfully carried out Stored&Current

Question is does anybody have the procedure for bleeding the suspension and/or which adaptations
to perform to get vehicle suspension ride height restored.

thanks

 

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It should only ask for those last two faults if you wiped OUT the height calibration settings.

I don't think the AUTEL is going to to this job (Height Calibration)

You also need an alignment rack and a ROMNESS gauge.

 

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C1525-1
C1525-2  low pressure

- Check fluid level.

- With a scanner monitor hydraulic suspension pressure. normally its around 180-200 bar. 

- If pressure is within specification, the fault is not a currently an issue. 

- If pressure is OUT of specs, first verify correct fluid levels. ck for leaks. 
    ck wiring at pressure sensor, Replace sensor with a known good sesnor. 

- If pressures still NOT correct, suspect faulty suspension pump or other hydraulic fault. 

- Replacement of any hydraulic component requires bleed function "Rodeo" w/ scan tool to remove all air. 
   Perform the bleed function before replacement of any parts.

- This system requires a European scanner to diagnosis. C1525 low pressure.
 
After repairs it may be needed to apply pressure to the reservoir & open 1 bleeder at a time to prime hydraulics before operation. 
Pressure return circuit has a pressure of 10 bar with engine running. 
strut replacment requires calibration of strut w/ a europran scanner.

pattern failures include:

- Failed Hydraulic Pump / ABC Hydraulic Pump
- Tandem Pump
- Flush (ABC) Active Body Control
- Failed Front Hydraulic Suspension Valve Block
- Low Hydraulic Fluid Level

Image 1.png

Image 2.png

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19 hours ago, Peter Reese said:

C1525-1
C1525-2  low pressure

- Check fluid level.

- With a scanner monitor hydraulic suspension pressure. normally its around 180-200 bar. 

- If pressure is within specification, the fault is not a currently an issue. 

- If pressure is OUT of specs, first verify correct fluid levels. ck for leaks. 
    ck wiring at pressure sensor, Replace sensor with a known good sesnor. 

- If pressures still NOT correct, suspect faulty suspension pump or other hydraulic fault. 

- Replacement of any hydraulic component requires bleed function "Rodeo" w/ scan tool to remove all air. 
   Perform the bleed function before replacement of any parts.

- This system requires a European scanner to diagnosis. C1525 low pressure.
 
After repairs it may be needed to apply pressure to the reservoir & open 1 bleeder at a time to prime hydraulics before operation. 
Pressure return circuit has a pressure of 10 bar with engine running. 
strut replacment requires calibration of strut w/ a europran scanner.

pattern failures include:

- Failed Hydraulic Pump / ABC Hydraulic Pump
- Tandem Pump
- Flush (ABC) Active Body Control
- Failed Front Hydraulic Suspension Valve Block
- Low Hydraulic Fluid Level

The following code(s) wont clear. If I understand correctly the symptom(s) wont disappear with code(s)
present even if you have repaired the problem.

C1525-32 Calibration of the plunger travel sensors is not successfully carried out. Stored&Current
C1526-64 Load adjustment is not successfully carried out Stored&Current

These code(s) occurred when I went into "Activation of the level valves" and activated the lift on each strut.
They went up and down when prompted and the vehicle sat level and a normal height.

As soon as we turned the vehicle off it squatted on the ground.

No suspension leaks anywhere so far....

Level pressure sensor values

                                Range (2.00 - 3.00)     Ride Height Level        Plunger Travel     

Driver Front                .98                                     89mm                        84mm

Passenger Front        4.0                                      91mm                        85mm

Driver Rear                4.57                                  106mm                      122mm

Passenger Rear          .78                                  102mm                       121mm

ABC Pressure     192 bar

Looks like I need to get the strut range back within spec...

Please advise....

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16 hours ago, Jivi Khehar said:

It should only ask for those last two faults if you wiped OUT the height calibration settings.

I don't think the AUTEL is going to to this job (Height Calibration)

You also need an alignment rack and a ROMNESS gauge.

 

It is possible I did this, but I not sure how.

I did tell it to raise and lower each strut for low speed and it worked.

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Will it let you perform an automatic level adjustment?

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2 hours ago, Jivi Khehar said:

Will it let you perform an automatic level adjustment?

I will update you soon....There are alot of procedures under Calibrations in this scanner. Is there a specific name for this on your scanner?

I do not have an "Automatic Level Adjustment.

I do have the following...

  • Raise and lower the suspension struts at low speed
  • Raise and lower the suspension struts at medium speed
  • Raise and lower the suspension struts at high speed

I originally performed the low speed calibration and it worked until I shut the vehicle off. 
I did it originally because the vehicle was sitting level, but clearly too high and wanted to make sure the struts were responding.

The switch on the dash for the ride height is also not responsive when trying to raise or lower the vehicle.

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You are in the calibration menu, it should ask you for height measurements at each wheel.

Somehow you wiped the settings....

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1 hour ago, Jivi Khehar said:

You are in the calibration menu, it should ask you for height measurements at each wheel.

Somehow you wiped the settings....

I have been able to set the height of the calibration back within spec (2.00 - 3.00)

I have successfully re-calibrated the plunger travel sensors and the only code left is...

C1526-64 Load adjustment is not successfully carried out Stored & Current

I know it is not on a Mercedes alignment machine...my shop does have an almost perfect level floor for reference...
We are at -6mm on the driver rear strut. Everyone else is at -5mm.

We did make sure nothing of any significant weight is in the cab or trunk.
It wont pass the Load Adjustment  calibration yet keeping the ABC Display On.

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Vehicle was sitting low this morning and the suspension fluid had pushed out of the reservoir and leaked on the ground.

only code in vehicle...

C1526-64 Load adjustment is not successfully carried out Stored & Current

Anybody?

 

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If the fluid is pushed out of the reservoir, you have at least one bad pressure reservoir.

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Gut Feeling?? You may have LOST the Level Adjustment Settings, as they
may have been wiped.  ESWAG on that (Educated Scientific WILD ASS Guess) ;)

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40 minutes ago, Administrator said:

Gut Feeling?? You may have LOST the Level Adjustment Settings, as they
may have been wiped.  ESWAG on that (Educated Scientific WILD ASS Guess) ;)

Is there a way to get them back?

1 hour ago, Jivi Khehar said:

If the fluid is pushed out of the reservoir, you have at least one bad pressure reservoir.

I have been looking in the repair info, but have not found anything about confirming which pressure "reservoir"? reservoir?

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Picture0001.jpg

Picture0002.jpg

Picture0003.jpg

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Thanks Peter....that helps....

I see the front and rear axle pressure reservoirs.
I always called them accumulators...Is there a test to isolate which or both are contributing to the symptom?

The vehicle was sitting equally low relative to front and rear.

 

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1 hour ago, Administrator said:

Gut Feeling?? You may have LOST the Level Adjustment Settings, as they
may have been wiped.  ESWAG on that (Educated Scientific WILD ASS Guess) ;)

Jivi

If any combination of the reservoirs are bad will it contribute to the failing Level Adjustment Settings?
I don't remember wiping any data out of the vehicle when we first installed the pump, but I it possible I did something accidentally.

I would seem to me if we have an internal pressure problem then it might be contributing to why I cant get the
Load Adjustment to pass.

Any words of wisdom? ESWAG gladly accepted ;)

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The Load Calibration should NOT be affected by bad accumulators. (Accumulator Part # 220-327-0115) X2

How many BAR is the system pressure? (Around 195-200 spec.)

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26 minutes ago, Jivi Khehar said:

The Load Calibration should NOT be affected by bad accumulators. (Accumulator Part # 220-327-0115) X2

How many BAR is the system pressure? (Around 195-200 spec.)

Average is 192

I have seen it as low as 188

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Do you know anyone close to you with an SDS?

I think the AUTEL is your limiting factor now/

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1 minute ago, Jivi Khehar said:

Do you know anyone close to you with an SDS?

I think the AUTEL is your limiting factor now/

Unfortunately no. I might as well be on an island...

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I believe Jivi is correct.  This answer SUCKS Michael, but now.....
you are limited in what you can do.

The second point is that without an alignment machine and Romness
software, this vehicle will not come into the proper alignment after
you have completed the job.

If you had an alignment machine, I could literally get that Romness Gauge
at cost for you @ $4,000.00.  But it is only for Mercedes! :37_disappointed::(

You don't want this vehicle "Eating Tires" in 25,000 miles.  You know
the customer will say "It NEVER did that until you worked on my car!"  :653_gun::653_gun::653_gun::653_gun::653_gun::653_gun::lol:!!!!!!!!!!!!!!!!!!

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42 minutes ago, Administrator said:

I believe Jivi is correct.  This answer SUCKS Michael, but now.....
you are limited in what you can do.

The second point is that without an alignment machine and Romness
software, this vehicle will not come into the proper alignment after
you have completed the job.

If you had an alignment machine, I could literally get that Romness Gauge
at cost for you @ $4,000.00.  But it is only for Mercedes! :37_disappointed::(

You don't want this vehicle "Eating Tires" in 25,000 miles.  You know
the customer will say "It NEVER did that until you worked on my car!"  :653_gun::653_gun::653_gun::653_gun::653_gun::653_gun::lol:!!!!!!!!!!!!!!!!!!

I just need the vehicle to clear the last code and quit squatting on the ground overnight.
The customer has already been told he will have to make a trip to the dealer for an alignment.

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Let me see if i can borrow an AUTEL from somewhere, and "SEE" what you are looking at.

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That would be great! Even though ultimately we all need factory scanners,
this is the reality of auto repair with the Autel.

I am not afraid of it.....yet ;)

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We replaced the oil level control reservoir 220 320 04 15 and bled the system.
So far the vehicle kept its height overnight, but the code....

C1526-64 Load adjustment is not successfully carried out Stored & Current

Still won't clear after multiple attempts...Could be a hole in the Autel software.
Still not bad for a much as I was able to do so far.

The vehicle now responds with ride height buttons on the dash.
I am going to let it sit over the weekend and see if the suspension is still "up".

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