M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

ML320 power steering issue

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Old Jan 16, 2015 | 07:56 AM
  #1  
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2002 ML320
ML320 power steering issue

I have a 2002 ML320 and at low RPM (reversing) I have no power steering? Normally have to ride the brake and accelerator to keep up the RPM. Has anyone else had the same problem and what is the Fix / problem
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Old Jan 16, 2015 | 04:19 PM
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2003 ML55,2007 ML63
Check your belt & tensioner pulley. If they are bad the PS pump will not turn as required under low RPM's
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Old Jan 17, 2015 | 01:03 AM
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Thanks for your reply Art, I have checked the belts and pulley and they are OK. I will check and see what the idle RPM should be? Mine is around 500
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Old Jan 17, 2015 | 01:32 PM
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Originally Posted by epanna01
Thanks for your reply Art, I have checked the belts and pulley and they are OK. I will check and see what the idle RPM should be? Mine is around 500

You are way to low on the RPM, it should be between 675-725.

You must first check to see that the cable at the Pedal Value Sensor is not cracked (happens often).

Also check your accelerator pedal and see that it has no side to side movement, and that the spring is not stretched or broken.
Attached Thumbnails ML320 power steering issue-pedal-value-sensor.jpg  
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Pedal Value Sen.-Parts.pdf (67.2 KB, 318 views)
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Old Jan 18, 2015 | 06:11 AM
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Thanks Maj. Dundee. Thanks for the attachments I will check and make sure the pedal valve sensor is not cracked and replace if needed. Cheers
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Old Jan 19, 2015 | 05:57 AM
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Ok, I have checked the valve pedal sensor and it's not cracked. idle in park is 600/650 and in gear its just under 500. apart from udjusting up the throttle cable up the top, to increase the RPM where can I tweek up the RPM correctly. Thanks.
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Old Jan 19, 2015 | 06:01 AM
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Originally Posted by epanna01
Ok, I have checked the valve pedal sensor and it's not cracked. idle in park is 600/650 and in gear its just under 500. apart from udjusting up the throttle cable up the top, to increase the RPM where can I tweek up the RPM correctly. Thanks.
You can't, it must be done with a M/B scanner.
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Old Jan 20, 2015 | 07:45 AM
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Thanks
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Old Feb 11, 2015 | 06:49 AM
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OK, went to a service center and had it looked at, ESM error and ME2- SFI motor eltronics 2.8 error. The guy said that the cam sensor and crank angle sensors are faulty. $400.00++? He then cleared all the minor errors and I will take it back to him tomorrow to follow up on..?.
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Old Feb 11, 2015 | 10:12 AM
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Originally Posted by epanna01
OK, went to a service center and had it looked at, ESM error and ME2- SFI motor eltronics 2.8 error. The guy said that the cam sensor and crank angle sensors are faulty. $400.00++? He then cleared all the minor errors and I will take it back to him tomorrow to follow up on..?.

The Cam And Crank Sensors have nothing to do with how low or how high the engine RPM's run at. You are being taken for a $400 ride by this mechanic.
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Old Feb 11, 2015 | 06:06 PM
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Thanks Maj.Dundee, this guy is a MB service tech, has all the MB electronic plug in equip and a print out of all errors (6pages) I will get someone else to get 2nd opinion on printout reports.
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Old Feb 12, 2015 | 06:02 AM
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Had both sensors replaced. Cam angle sensor causing car to run retarded and also broken. Car now runs / drives allot better. Diffrent car, idle still a little low. Still to have other faults fixed next time as Mach didn't have time today. Booked in for next week as it still has electronic error SFI 2.8?
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Old Feb 12, 2015 | 01:36 PM
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That means your car had different issues. The RPM is not related to Crank or Cam sensor.
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