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37 90 ... Troubleshooting on Dynamic Drive (ARS)

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TROUBLESHOOTING ON DYNAMIC DRIVE (ARS) CHART

Fault Cause Remedy
Noises (banging, rattling) during straight-ahead driving and gentle steering through centre Screw connections on front axle/rear axle loose Refer to 31 90 ... FRONT AXLE TROUBLESHOOTING and 33 90 ... REAR AXLE TROUBLESHOOTING .
Stabilizer link loose or defective
  1. Check stabilizer link joints for damage/play; if necessary, replace stabilizer link  . See 35 STABILIZER BAR .
  2. Tighten down screw connections to torque.
Stabilizer screw connection loose. Tighten down screw connections.
Hydraulic lines installed distorted
  1. Check whether hydraulic lines are installed in holders twisted (when system is depressurized, hydraulic lines must be guided in holders virtually without elastic distortion of decoupling elements).
  2. Align all hydraulic lines for Dynamic Drive as specified in repair instruction  
Hydraulic lines fitted too closely or have insufficient clearance (elastic movement of line during pressure build-up)
  1. Check whether hydraulic lines are fitted too closely or have insufficient clearance (for minimum clearance, see repair instruction )
  2. Align all hydraulic lines for Dynamic Drive as specified in repair instruction  
Line holders loose
  1. Check whether line holders are correctly screwed and holder halves are correctly engaged
  2. Fit all line holders as specified in repair instruction   .
Decoupling elements of hydraulic lines must not be damaged or missing
  1. Check whether decoupling elements (rubber) are present and correctly fitted or damaged
  2. Replace/fit decoupling elements
Decoupling elements of valve block holder damaged or missing
  1. Check whether decoupling elements (rubber) are present and correctly fitted or damaged
  2. Replace valve block holder  
Line holders on hydraulic lines missing or fitted in incorrect position
  1. Check whether line holders are present and fitted in correct position
  2. Fit line holders as specified in repair instruction  
Valve block does not conform to specifications
  1. Carry out initial Dynamic Drive operation 
  2. If other causes are ruled out or if diagnosis faults are detected, replace valve block  
Rattling noises during excitation provided by road surface and straight-ahead driving (without altering steering wheel position) and Noises occur to a large extent independently of temperature influences Screw connections on front axle/rear axle loose Refer to 31 90 ... FRONT AXLE TROUBLESHOOTING and 33 90 ... REAR AXLE TROUBLESHOOTING .
Stabilizer link loose/defective
  1. Check stabilizer link joints for damage; if necessary, replace stabilizer link  . See 35 STABILIZER BAR .
  2. Tighten down screw connections to torque
Stabilizer screw connection loose Tighten down screw connections
Hydraulic lines installed distorted
  1. Check whether hydraulic lines are installed in holders twisted (when system is depressurized, hydraulic lines must be guided in holders virtually without elastic distortion of decoupling elements)
  2. Align all hydraulic lines for Dynamic Drive as specified in repair instruction  . 
Hydraulic lines fitted too closely or have insufficient clearance (elastic movement of line during pressure build-up)
  1. Check whether hydraulic lines are fitted too closely or have insufficient clearance (for minimum clearance, see repair instruction)
  2. Align all hydraulic lines for Dynamic Drive as specified in repair instruction  
Line holders loose
  1. Check whether line holders are correctly screwed and holder halves are correctly engaged
  2. Fit all line holders as specified in repair instruction  
Decoupling elements of hydraulic lines must not be damaged or missing
  1. Check whether decoupling elements (rubber) are present and correctly fitted or damaged
  2. Replace or fit decoupling elements
Decoupling elements of valve block holder damaged or missing
  1. Check whether decoupling elements (rubber) are present and correctly fitted or damaged
  2. Replace valve block holder 
Line holders on hydraulic lines missing or fitted in incorrect position
  1. Check whether line holders are present and fitted in correct position
  2. Fit all line holders as specified in repair instruction  
Protective rubber cap (black) not removed from Y-connecting piece of front axle active stabilizer pneumatic lines
  1. Check whether protective rubber cap (black) is fitted on Y - connecting piece
  2. Pull protective rubber cap (black) off Y-piece and fit pneumatic line as specified in repair instruction 
Vent valve leaking
  1. Check whether air filter element (black plastic) is filled to overflowing at end of vent line with Pentosin
  2. If other causes are ruled out and noise is reproducible during test drive, replace vent valves and air filter element  in pairs
Valve block does not conform to specifications
  1. Carry out initial Dynamic Drive operation 
  2. If other causes are ruled out or if diagnosis faults are detected, replace valve block 
Rattling noises during excitation provided by road surface and straight-ahead driving (without altering steering wheel position) and Noises only at higher temperatures (i.e. from outside temperatures from 25 °C or in event of greatly heated-up vehicle at operating temperature) Vent valve defective
  1. Check during test drive whether noises occur during straight-ahead driving and one-side excitation provided by road surface on front axle
  2. If other causes are ruled out and noise is reproducible during test drive, replace vent valves  in pairs
Noises (hissing) Flow noise of hydraulic fluid in damaged hydraulic lines
  1. Check whether hydraulic lines are crushed or bent
  2. Rectify identified defects on hydraulic lines 
Flow noise of hydraulic fluid in valve block not conforming to specifications
  1. Carry out initial Dynamic Drive operation 
  2. If a fault on valve block was diagnosed during initial operation, replace valve block 
Whining noises during cornering at an engine speed Whining noises from pump drive
  1. Check whether whining noises come from power steering pump or pump drive
  2. If not yet done, install noise-optimized belt pulley 
Pump noise from engine compartment depending on engine speed or only during cornering Dynamic Drive pressure line has impaired function or is damaged
  1. Check whether Dynamic Drive pressure line between power steering pump and valve block is crushed or bent
  2. Replace Dynamic Drive pressure line
Power steering pump defective
  1. Check whether power steering pump and pump drive are damaged
  2. If other causes are ruled out, replace power steering pump 
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