3.1 Adaptive Damping System (ADS) Models /066

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Bryce Houston
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1 31 Model /066 Page Diagnosis Function Test 11/1 Diagnostic Trouble Code (DTC) Memory 12/1 Complaint Related Diagnostic Chart 13/1 Electrical Test Program Component Locations 21/1 Preparation for Test 22/1 Test 23/1 Hydraulic Test Program Component Locations 31/1 Hydraulic Oil Pump Test 32/1 Levelling Valve Function Test 33/1 Levelling Valve Pressure Test 34/1 Valve Assembly Internal Leaage Test 35/1 Front Axle Strut Suspension Lea Test 36/1 Damping Test 38/1 b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS C/1

2 Diagnosis - Function Test U Figure 1 A1e27 ADS MIL S45/1 Comfort/sport switch (ADS) Component Locations b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 11/1

3 Diagnosis - Function Test Test step/test sequence Test condition Nominal value Possible cause/remedy 1) O 10 ADS MIL (A1e27) Ignition: ON A1e27 comes on A1e27 23 O 60, ADS control module () 23O 10 Engine: at Idle A1e27 goes out Steering angle sensor (N49) not initialized, turn steering wheel from right to left stop, DTC stored in memory, read out DTC 12, ADS control module (), Circuit O 20 O 20 Not for USA Vehicles O 30 Not for USA Vehicles O 40 Comfort/sport switch (S45/1) Switch (S45/1) set to: Sport Indicator lamp in switch (S45/1): ON S45/1 23 O 110 Comfort OFF 1) Observe Preparation for Test, see 22 b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 11/2

4 Diagnosis - Diagnostic Trouble Code (DTC) Memory Test Preparation for DTC Readout 1 Connect impulse counter scan tool to the data lin connector (X11/4) according to the connection diagram as shown in section 0 2 Read out any stored DTC s from ADS control module () Note: Connect yellow wire from impulse counter scan tool to socet 9 of Special Tools Pulse counter b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 12/1

5 Diagnosis - Diagnostic Trouble Code (DTC) Memory Diagnostic trouble code (DTC) Possible cause Test step/remedy 1) I No fault in system In case of complaint: 23 (entire test) and 33 2 ADS control module () Replace 3 Body acceleration sensor (B24) 23 O 80 4 Wheel acceleration sensor (B24/1) 23 O 70 5 Steering angle sensor (N49) 23 O 90 6 Left/right front axle damper valve assembly, front axle solenoid valve 1 (Y51y1, Y52y1) 7 Left/right front axle damper valve assembly, front axle solenoid valve 2 (Y51y2, Y52y2) 8 Left/right rear axle damper valve assembly, rear axle solenoid valve 1 (Y53y1, Y54y1) 9 Left/right rear axle damper valve assembly, rear axle solenoid valve 2 (Y53y2, Y54y2) I0 II Not for USA vehicles Not for USA vehicles 23 O 190, O 170, O O 150 I2 Vehicle speed signal (VSS) from ABS or ABS/ASR control module) 23 O 40 I3 Oil level switch (S44) 23 O 50 I4 Steering angle sensor (N49) not initialized 23 O 100 1) Observe Preparation for Test, see 22 b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 12/2

6 Diagnosis - Complaint Related Diagnostic Chart Complaint/Problem Possible cause Remedy/Test step 1) ADS MIL (A1e27) comes on with engine running Damping too hard/too soft Damping control not functioning Steering angle sensor (N49) not initialized DTC stored Turn steering wheel from right to left stop O 10 Vehicle level too low (base level) 34 O 10 (SMS, Job No ) Vehicle lowers at rear axle Hydraulic oil level too low Vehicle lowers with engine off Visually chec for external leas Visually chec for external leas Visually chec for external leas 34 O 10 Vehicle lowers with engine running 33 O 10 Vehicle lowers at front axle Visually chec for external leas 34 O O 10 Vehicle does not lift at one or both axle 33 O O 10 1) Observe Preparation for Test, see 22 b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 13/1

7 Electrical Test Program - Component Locations U Figure 1 A1e27 ADS MIL N49 Steering angle sensor S45/1 Comfort/sport switch Components in Passenger Compartment b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 21/1

8 Electrical Test Program - Component Locations P Figure 2 B24 Body acceleration sensor B24/1 Wheel acceleration sensor ADS control module S44 Oil level switch X98 Comfort/sport switchover test connector (2-pole) Y51 Left front axle damper valve assembly Y52 Right front axle damper valve assembly Components on Front Axle and in Engine Compartment b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 21/2

9 Electrical Test Program - Component Locations P Figure 3 S45 Load condition switch Y53 Left rear axle damper valve assembly Y54 Right rear axle damper valve assembly Components in Rear of Vehicle b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 21/3

10 Electrical Test Program - Preparation for Test 1 Ignition: OFF 2 Disconnect ADS control module () 3 Connect socet box and test cable to ADS control module () according to connection diagram on following page Electrical wiring diagrams: Electrical Troubleshooting Manual, Model 129 Special Tools pin socet box pin test cable Electrical connecting set Equipment Digital multimeter 1) Flue models 23, 83, 85, 87 1) Available through the MBUSA Standard Equipment Program b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 22/1

11 Electrical Test Program - Preparation for Test Figure ADS control module connector 002 Test cable 003 Digital multimeter 004 Socet box (35-pole) ADS control module Connection Diagram - Socet Box P b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 22/2

12 Electrical Test Program - Preparation for Test P Connection Diagram - Signal Generator Figure ADS control module connector 002 Test cable 003 Digital multimeter 004 Socet box (35-pole) 032 Signal generator ADS control module b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 22/3

13 Electrical Test Program - Test O A Test scope Test connection Test condition Nominal value Possible cause/remedy O 10 ADS control module () Voltage supply Circuit 87L 23 w c L 1 Ignition: ON V O 11 O 11 Voltage supply from overvoltage protection relay module (K1/2) W16 c L 1 Ignition: ON V K1/2, O 12 O 12 Ground wire W16 b L 23 Ignition: OFF < 1 ] Ground (component compartment) (W16) O 20 Circuit 61 voltage 23 w b L 2 Ignition: ON < 1 V Generator (G2) Engine: at Idle V O 30 Diagnosis ouput 23 w b L 4 Ignition: ON V ADS control module () b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/1

14 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O 40 I2 Left front axle VSS (from ABS or ABS/ASR control module) 23 w c L 5 Raise front of vehicle Ignition: ON Turn left front wheel by hand > 01 V ~ or DM, Chassis & Drivetrain Vol 2 section 61 23, ADS control module () O 50 I3 Oil level switch (S44) Activation 23 w c L 6 Oil level between MAX and MIN Ignition: ON V Determine cause of lea, refill if necessary O 51, ADS control module () O 51 Wiring 23 w c L 6 Disconnect S44 Bridge socets 1 and 2 on connector < 1 V O 52 O 52 Internal resistance 23 w b L 6 Ignition: ON Disconnect > 20 ] S44 b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/2

15 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O 60 ADS MIL (A1e27) 23 w c L 7 Ignition: ON < 1 V A1e27: ON O 61, ADS control module () Engine: at Idle V A1e27: OFF 12, O 61 Wiring 23 w c L 7 Ignition: OFF Disconnect control module () Ignition: ON V A1e27 b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/3

16 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O 70 4 Wheel acceleration sensor (B24/1) Voltage supply 24 w c L 8 Ignition: ON V ADS control module () Static sensor signal (off) 24 w c L V B24/1 Dynamic sensor signal (on) 24 w c L 25 Vigorously move right front section of vehicle up and down by hand > 1 mv ~ Note: The value changes with the movement of the vehicle Nominal value can only be attained with digital multimeter set to mv ~ B24/1 b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/4

17 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O 80 3 Body acceleration sensor (B24) Voltage supply Static sensor signal (off) 27 w c L 9 Ignition: ON V ADS control module () 27 w c L V B24 Dynamic sensor signal (on) 27 w c L 26 Vigorously move left front section of vehicle up and down by hand > 5 mv ~ Note: The value changes with the movement of the vehicle Nominal value can only be attained with digital multimeter set to mv ~ B24 b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/5

18 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O 90 5 Steering angle sensor (N49) Signal 23 w f L 21 Ignition: ON > 3 V ~ ADS control module (), O 91 O 91 Steering angle sensor 23 w f L 21 Ignition: OFF Disconnect control module () Ignition: ON > 3 V ~ N49, O 92 O 92 Voltage supply Circuit 30a N49x1 2 w c L 4 Ignition: OFF Disconnect connector (N49x1) V O 93 O 93 Voltage supply Circuit 87L N49x1 2 w c L 3 Ignition: ON V Overvoltage protection relay module (K1/2) O 100 I4 1) Steering angle sensor (N49) Initialization Engine: at Idle Turn steering wheel from right to left stop A1e27 goes out O 90 1) DTC I4 will automatically erase from after initialization b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/6

19 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O 110 Comfort/sport switch (S45/1) 22 w c L 30 Ignition: ON Switch S45/1 in: Comfort setting Sport setting V < 1 V Indicator lamp in switch: ON S45/1, ADS control module (), O 111 O 111 Internal resistance 22 w b L 30 Ignition: OFF Disconnect control module () Switch S45/1 in: Comfort setting > 20 ] S45/1 Sport setting < 1 ] O 120 O 130 O 140 Not for USA Vehicles Not for USA Vehicles Not for USA Vehicles b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/7

20 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O Left/right rear axle damper valve assembly, rear axle solenoid valve 2 (Y53y2, Y54y2) 32 w b L 12 Ignition: OFF Disconnect control module () 5 8 ] O 151 O 151 Rear axle solenoid valve 2 (Y54y2) 32 w b L 12 Disconnect control module () Disconnect connector (Y54x1) ] Right rear axle damper valve assembly (Y54), O 152 O 152 Rear axle solenoid valve 2 (Y53y2) 32 w b L 12 Disconnect control module () Disconnect connector (Y53x1) ] Left rear axle damper valve assembly (Y53) b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/8

21 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O Left/right rear axle damper valve assembly, rear axle solenoid valve 1 (Y53y1, Y54y1) 32 w b L 14 Ignition: OFF Disconnect control module () 5 8 ] O 161 O 161 Rear axle solenoid valve 1 (Y54y1) 32 w b L 14 Disconnect control module () Disconnect connector (Y54x1) ] Right rear axle damper valve assembly (Y54), O 162 O 162 Rear axle solenoid valve 1 (Y53y1) 32 w b L 14 Disconnect control module () Disconnect connector (Y53x1) (Figure 7) ] Left rear axle damper valve assembly (Y53) O Right front axle damper valve assembly, front axle solenoid valve 2 (Y52y2) 34 w b L 16 Ignition: OFF Disconnect control module () ] Y52 b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/9

22 Electrical Test Program - Test Test step DTC Test scope Test connection Test condition Nominal value Possible cause/remedy O Left front axle damper valve assembly, front axle solenoid valve 2 (Y51y2) 34 w b L17 Ignition: OFF Disconnect control module () ] Y51 O Right front axle damper valve assembly, front axle solenoid valve 1 (Y52y1) 34 w b L 18 Ignition: OFF Disconnect control module () ] Y52 O Left front axle damper valve assembly, front axle solenoid valve 1 (Y51y1) 35 w b L 19 Ignition: OFF Disconnect control module () ] Y51 O 210 Level adjustment chec valve (Y37) Activation Y37 1 v c K 2 Unplug connecter from Y37 Ignition: ON V O 211 K1/2, (Figure 5) O 211 Level adjustment chec valve (Y37) Internal resistance Y37 1 v b K 2 Ignition: OFF ] Y37 b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/10

23 Electrical Test Program - Test Figure 1 W16 Ground (component compartment) Figure 2 X33/5 ADS connector (front/rear suspension) (4-pole) X33/6 ADS connector (front/rear suspension) (8-pole) P P C P Figure 3 X4/10 Terminal bloc (circuit 30/circuit 61 battery) (3-pole) b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/11

24 Electrical Test Program - Test Figure 4 X11/4 Data lin connector (DTC readout) X30/1 Multi-function connector bloc Figure 5 K1/2 Overvoltage protection relay module (87E/87L/30a, 9-pole) N30 ABS control module N30/1 ABS/ASR control module P A P P Figure 6 L6/1 Left front axle VSS sensor b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/12

25 Electrical Test Program - Test Figure 7 Y53x1 Left rear axle damper valve assembly connector Y54x1 Right rear axle damper valve assembly connector P b Diagnostic Manual Chassis and Drivetrain 09/95 31 ADS 23/13

26 Hydraulic Test Program - Component Locations Figure 1 1 Hydraulic oil pump 2 Hydraulic oil reservoir 6 Front axle leveling valve 11 Front suspension strut 12 Front pressure reservoir 52 Distributor Hydraulic Components on Front Axle and in Engine Compartment P b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 31/1

27 Hydraulic Test Program - Component Locations Figure 2 3 Rear axle leveling valve 4 Rear pressure reservoir 5 Rear suspension strut 55 Rear axle connecting rod Hydraulic Component on Rear Axle and in Rear of Vehicle P b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 31/2

28 Hydraulic Test Program - Hydraulic Oil Pump Test Preparation for Test 1 Chec oil level in oil reservoir, correct if necessary 2 Unscrew connecting rods (54, 55) at front and rear leveling valve levers (set levers to neutral position) 3 Depressurize rear axle hydraulic system by slowly opening bleeder screw (3p) Connect drain hose and place into container 4 Connect test gauge to rear axle leveling valve bleeder screw (S2) 5 Set both leveling valve levers to position F (fill) 6 Open pressure supply screw (50a) by maximum of 1 turn 7 Disconnect return line (T) at oil reservoir (2) and using a suitable hose, hold it in a measuring glass a To perform this rest, the oil fill quantity must be increased by 05 liters If the oil reservoir was empty, the hydraulic oil pump must first be bled by disconnecting the high pressure flexible hose at the steel line Run the engine and hold the hose into a container until the oil exits free of bubbles Special Tools Tester Box wrench b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 32/1

29 Hydraulic Test Program - Hydraulic Oil Pump Test Figure 1 2 Hydraulic oil reservoir 3 Rear axle leveling valve 3p Bleeder screw 6 Front axle leveling valve 6p Bleeder screw 50a Pressure supply screw 54 Front axle connecting rod 55 Rear axle connecting rod T Return line - oil reservoir distributor/valve unit Component Locations Model 129 P b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 32/2

30 Hydraulic Test Program - Hydraulic Oil Pump Test Test step Test scope Test connection Test condition Nominal value Possible cause/remedy 1) O 10 Delivery pressure 7 WARNING! High pressure bar Connect test gague to rear axle leveling valve connection S2 Engine: at Idle Set leveling valve lever(s) to position F (fill) Observe test gauge needle until pressure no longer increases > 133 bar Delivery capacity at idle > 02 l/min Delivery pressure < 133 bar, Delivery capacity < 02 l/min: Replace hydraulic oil pressure pump (SMS, Job No ) Delivery pressure < 133 bar, Delivery capacity > 02 l/min: see 34 1) Observe Preparation for Test, see 22 b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 32/3

31 Hydraulic Test Program - Hydraulic Oil Pump Test Figure 2 A Version Æ 09/92 3m Connection fitting 3p Bleeder screw B Version 10/92 Æ 3p Bleeder screw Figure 3 Version 10/92 Æ 3 Rear axle leveling valve 3p Bleeder screw Arrow Closing screw P P P a Figure 4 Version Æ 08/90 50a Pressure supply screw b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 32/4

32 Hydraulic Test Program - Leveling Valve Function Test Figure 1 3 Rear axle leveling valve 6 Front axle leveling valve 50a Pressure supply screw 54 Front axle connecting rod 55 Rear axle connecting rod Preparation for Test 1 Chec oil level in oil reservoir, correct if necessary 2 Unscrew connecting rods (54, 55) at leveling valve levers (set lever to neutral position) a When the system is empty (ie: after repair wor) the pressure supply screw (50a) must be loosened by approximately one turn to allow both leveling valves to fill P b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 33/1

33 Hydraulic Test Program - Leveling Valve Function Test Test step Test scope Test connection Test condition Nominal value Possible cause/remedy O 10 Control function Leveling valve Engine: at Idle Set leveling valve lever to position F (fill) Vehicle must raise at respective axle 34, 35 b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 33/2

34 Hydraulic Test Program - Leveling Valve Pressure Test Preparation for Test 1 Chec oil level in oil reservoir, correct if necessary 2 Unscrew connecting rod at front and rear leveling valve levers (set levers to neutral position) 3 Depressurize hydraulic system by slowly opening bleeder screw (3p or 6p) Connect drain hose and place into container 4 Connect test gauge to leveling valve bleeder screw Front axle: Connection 6p Rear axle: Connection 3p or leveling valve connection S2 Special Tools Tester Box wrench Box wrench b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 34/1

35 Hydraulic Test Program - Leveling Valve Pressure Test Figure 1 3 Rear axle leveling valve 3p Bleeder screw 6 Front axle leveling valve 6p Bleeder screw 50a Pressure supply screw Component Locations P b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 34/2

36 Hydraulic Test Program - Leveling Valve Pressure Test Test step Test scope Test connection Test condition Nominal value Possible cause/remedy O 10 Opening pressure of relief valve a WARNING! High Pressure J 250 Connect test gauge to front or rear axle leveling valve Engine: at Idle Set leveling valve lever to F (fill) bar > 153 bar Replace leveling valve < 133 bar Set leveling valve on other axle to F (fill) and read pressure again If new pressure reading is: > 133 bar Chec pressure supply screw (50a) for proper seating, Replace valve assembly < 133 bar 33 O 10 Note: If delivery capacity > 02l/min, replace leveling valve b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 34/3

37 Hydraulic Test Program - Leveling Valve Pressure Test Test step Test scope Test connection Test condition Nominal value Possible cause/remedy O 20 Overflow valve function J 250 Connect test gauge to front or rear axle leveling valve Engine: at Idle Set leveling valve lever to F (fill) until gauge indicates approximately 80 bar Set leveling valve lever to L (empty) bar Rear axle: Replace leveling valve Front axle: > 36 bar, replace leveling valve < 30 bar, 36 O 10 Note: If front axle struts are not leaing, replace leveling valve b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 34/4

38 Hydraulic Test Program - Valve Assembly Internal Leaage Test Preliminary wor: Leveling valve pressure test 34 Preparation for Test 1 Chec oil level in oil reservoir, correct if necessary 2 Unscrew connecting rod at front and rear leveling valve levers (set levers to neutral position) 3 Disconnect lea oil line of suspension strus at front axle and close steel line 4 Chec pressure supply screw (50a) for proper seating 5 Disconnect return line (T) at oil reservoir Special Tools Box wrench Box wrench b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 35/1

39 Hydraulic Test Program - Valve Assembly Internal Leaage Test Figure 1 2 Hydraulic oil reservoir 3 Rear axle leveling valve 6 Front axle leveling valve 50a Pressure supply screw 54 Front axle connecting rod 55 Rear axle connecting rod LL Lea oil return line - left suspension strut, front axle distirbutor/valve unit T Return line - oil reservoir distributor/valve unit 038f Coupling (from hydraulic it) 038n Vent screw (from hydraulic it) Component Locations P b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 35/2

40 Hydraulic Test Program - Valve Assembly Internal Leaage Test Test step Test scope Test connection Test condition Nominal value Possible cause/remedy O 10 Valve assembly internal leaage Engine: at Idle Set front axle leveling valve lever to F (fill) Then move leveling valve lever to center position Vehicle must raise at front axle Replace distributor valve or valve assembly Set rear axle leveling valve lever to F (fill) Then move leveling valve lever to center position Vehicle must raise at rear axle Replace distributor valve or valve assembly Engine: OFF Wait at least two minutes (allows valves to close) Move both leveling valve levers to L (empty) Vehicle must not lower 36 Lea oil discharge Disconnect return line (T) at reservoir Attach drain hose and place into measuring container Maximum of 2 cc oil discharge in four hours Replace distributor valve or valve assembly b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 35/3

41 Hydraulic Test Program - Front Axle Strut Suspension Lea Test P Figure 1 11 Front suspension strut LL Lea oil return line for left suspension strut, front axle distributor/valve unit LR Lea oil return line for right suspension strut, front axle distributor/valve unit (not shown) Preparation for Test Weight of vehicle must rest on wheels Vehicle must be in normal load/curb weight condition b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 36/1

42 Hydraulic Test Program - Front Axle Strut Suspension Lea Test Test step Test scope Test connection Test condition Nominal value Possible cause/remedy O 10 Lea oil quantity Measuring container Disconnect lea oil line from lea oil hoses (LL and LR) and place lea oil line in measuring container Maximum amount of lea oil : 2 cc in four hours Internal lea in strut, replace suspension strut b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 36/2

43 Hydraulic Test Program - Damping Test P A Figure 1 ADS control module X98 Comfort/sport switchover test connector (2-pole) Preparation for Test 1 Chec oil level in reservoir, correct if necessary 2 Connect ] resistance substitution unit to comfort/sport switchover test connector (X98) Special Tools Ohm decade b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 38/1

44 Hydraulic Test Program - Damping Test Test step Test scope Test connection Test condition Nominal value Possible cause/remedy O 10 Damping adjustment B on X98 Set R=1200 ] Switch (S45/1) in: Comfort Engine: at Idle Hard damping Test all four damping valves by manually rocing vehicle Damping must be noticeably hard 23 Damper valves, Damper valve hydraulics, ADS control module () Soft damping B on X98 Set R=420 ] Test all four damping valves by manually rocing vehicle a First roc vehicle at each axle, then for comparison, disconnect the left/right front/rear axledamper valve assembly connector (Y51x1, Y52x1, Y53x1, Y54x1) while the engine is running Damping must be noticeably soft 23 Damper valves, Damper valve hydraulics, Hydraulic oil reservoir, ADS control module () a If the ADS MLI (A1e27) comes on after completing this test, you must clear DTC s 6 and 7 b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 38/2

45 Hydraulic Test Program - Damping Test Figure 2 Y51x1 Left front axle damper valve assembly connector Figure 3 Y52x1 Right front axle damper valve assembly connector P P P Figure 4 Y53x1 Left rear axle damper valve assembly connector Y54x1 Right rear axle damper valve assembly connector b Diagnostic Manual Chassis and Drivetrain 04/94 31 ADS 38/3

3.4 Adaptive Damping System (ADS II) with electronic level control Contents

3.4 Adaptive Damping System (ADS II) with electronic level control Contents Contents 3.4 Model 129 as of 09/95 Page Diagnosis Function Test................................... 11/1 Diagnostic Trouble Code (DTC) Memory................ 12/1 Complaint Related Diagnostic Chart...................