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

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DYNAMIC DRIVE (ARS) TROUBLESHOOTING CHART

Fault	Cause	Remedy
Noises (banging, rattling) during straight-ahead driving and gentle steering through center	Screw connections on front axle/rear axle loose	Refer to TROUBLESHOOTING front axle or TROUBLESHOOTING rear axle
	Stabilizer link loose or defective	Check stabilizer link joints for damage/play; if necessary, replace stabilizer link . See 31 35 005 REMOVING AND INSTALLING/REPLACING PUSH ROD (STABILIZER LINK) FOR LEFT/RIGHT STABILIZER . Tighten down screw connections to torque
	Stabilizer screw connection loose	Tighten down screw connections as specified in repair instruction
	Hydraulic lines installed distorted	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) 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)	Check whether hydraulic lines are fitted too closely or have insufficient clearance (for minimum clearance, see repair instruction) Align all hydraulic lines for Dynamic Drive as specified in Connecting Lines
	Line holders loose	Check whether line holders are correctly screwed and holder halves are correctly engaged Fit all line holders
	Decoupling elements of hydraulic lines must not be damaged or missing	Check whether decoupling elements (rubber) are present and correctly fitted or damaged Replace/fit decoupling elements
	Decoupling elements of valve block holder damaged or missing	Check whether decoupling elements (rubber) are present and correctly fitted or damaged Replace valve block holder
	Line holders on hydraulic lines missing or fitted in incorrect position	Check whether line holders are present and fitted in correct position Fit line holders as specified in repair instruction
	Valve block does not conform to specifications	Carry out initial DYNAMIC DRIVE operation 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 TROUBLESHOOTING front axle or TROUBLESHOOTING rear axle
	Stabilizer link loose/defective	Check stabilizer link joints for damage; if necessary, replace stabilizer link See 31 35 005 REMOVING AND INSTALLING/REPLACING PUSH ROD (STABILIZER LINK) FOR LEFT/RIGHT STABILIZER . Tighten down screw connections to torque
	Stabilizer screw connection loose	Tighten down screw connections
	Hydraulic lines installed distorted	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) Align all hydraulic lines for Dynamic Drive
	Hydraulic lines fitted too closely or have insufficient clearance (elastic movement of line during pressure build-up)	Check whether hydraulic lines are fitted too closely or have insufficient clearance (for minimum clearance, see repair instruction) Align all hydraulic lines for Dynamic Drive
	Line holders loose	Check whether line holders are correctly screwed and holder halves are correctly engaged Fit all line holders
	Decoupling elements of hydraulic lines must not be damaged or missing	Check whether decoupling elements (rubber) are present and correctly fitted or damaged Replace or fit decoupling elements
	Decoupling elements of valve block holder damaged or missing	Check whether decoupling elements (rubber) are present and correctly fitted or damaged Replace valve block holder
	Line holders on hydraulic lines missing or fitted in incorrect position	Check whether line holders are present and fitted in correct position Fit all line holders a
	Protective rubber cap (black) not removed from Y-connecting piece of front axle active stabilizer pneumatic lines	Check whether protective rubber cap (black) is fitted on Y-connecting piece Pull protective rubber cap (black) off Y-piece and fit pneumatic line as specified in repair instruction 2
	Vent valve leaking	Check whether air filter element (black plastic) is filled to overflowing at end of vent line with Pentosin 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	Carry out initial DYNAMIC DRIVE operation 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	Check during test drive whether noises occur during straight-ahead driving and one-side excitation provided by road surface on front axle 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	Check whether hydraulic lines are crushed or bent Rectify identified defects on hydraulic lines
Noises (hissing)	Flow noise of hydraulic fluid in valve block not conforming to specifications	Carry out initial DYNAMIC DRIVE operation 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	Check whether whining noises come from power steering pump or pump drive 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	Check whether Dynamic Drive pressure line between power steering pump and valve block is crushed or bent Replace Dynamic Drive pressure line
	Power steering pump defective	Check whether power steering pump and pump drive are damaged If other causes are ruled out, replace power steering pump . See PUMP AND OIL SUPPLY .