Trim Height Specifications
| RPO | Service Preferred | Tolerance | |
|---|---|---|---|
| Metric | English | ||
| Z Trim Height | |||
| FE2 (Base W/RPO LC3) | 50 mm (1.97 in) | 43.6-56.4 mm | 1.72-2.22 in |
| FE2 (Base W/RPO LH2) | 44 mm (1.73 in) | 37.6-50.4 mm | 1.52-2.06 in |
| D Trim Height | |||
| FE2 (Base W/RPO LC3) | 129 mm (5.08 in) | 122.6-135.4 mm | 4.83-5.33 in |
| FE2 (Base W/RPO LH2) | 120 mm (4.72 in) | 113.6-126.4 mm | 4.55-5.05 in |
Trim Height Specifications
Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information, and the vehicle RPO, will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Suspension General Diagnosis in order to identify the correct procedure for diagnosing the system and where the procedure is located.
| IMPORTANT | The following steps must be completed before using the symptom tables. |
- Determine whether the vehicle is equipped with an electrically assisted or active suspension system. Perform electrical diagnosis prior to beginning mechanical diagnosis. Refer to «Diagnostic Starting Point - Vehicle»(/cadillac/xlr/i-2003-2009/remont/oem-general-information/#vehicle-dtc-information__diagnostic-starting-point-vehicle) in Vehicle DTC Information.
- Review the system description and operation in order to familiarize yourself with the system functions. Refer to the appropriate description and operation: «General Description»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#front-suspension-system__general-description) in Front Suspension «General Description»(/cadillac/xlr/i-2003-2009/remont/suspension-rear/#rear-suspension-system__general-description) in Rear Suspension «General Description»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels__general-description) in Tires and Wheels
Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of any of the suspension subsystems.
- Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
- Inspect for proper tire size and inflation pressure. Refer to «Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label»(/cadillac/xlr/i-2003-2009/remont/hoistjack/#general-information) in General Information.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom
- «Ride Diagnosis»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__ride-diagnosis)
- «Vehicle Leads/Pulls»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__vehicle-leadspulls)
- «Body Leans or Sways in Corners»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__body-leans-or-sways-in-corners)
- «Suspension Bottoms»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__suspension-bottoms)
- «Memory Steer»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__memory-steer)
- «Poor Directional Stability»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__poor-directional-stability)
- «Noise Diagnosis - Front Suspension»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__noise-diagnosis-front-suspension)
- «Noise Diagnosis - Rear Suspension»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__noise-diagnosis-rear-suspension)
- «Suspension Strut and Shock Absorber Testing - On Vehicle»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__suspension-strut-and-shock-absorber-testing)
- «Wheel Bearings Diagnosis»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__wheel-bearings-diagnosis)
- «Radial Tire Lead/Pull Correction»(/cadillac/xlr/i-2003-2009/remont/wheel-tire-system/#tires-and-wheels__radial-tire-leadpull-correction)
Ride Diagnosis
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you review the Diagnostic Starting Point - Suspension General Diagnosis? | Go to Step 2 | Go to Diagnostic Starting Point - Suspension General Diagnosis |
| 2 | Verify that the ride is too soft or too hard. Does the vehicle ride normally? | System OK | Go to Step 3 |
| 3 | Inspect the tires for the proper inflation pressure. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . Is the tire inflation pressure correct? | Go to Step 5 | Go to Step 4 |
| 4 | Inflate the tires to the correct pressure. Did you complete the repair? | Go to Step 5 | |
| 5 | Inspect the vehicle trim height. Refer to Trim Height Specifications . Repair as necessary. Did you complete the inspection/repair? | Go to Step 6 | |
| 6 | If equipped, inspect the electronic suspension control system. Refer to Diagnostic Starting Point - Electronic Suspension Control . Repair as necessary. Did you find and complete the repair? | Go to Step 9 | Go to Step 7 |
| 7 | Inspect the following suspension components for wear or damage: Springs Shock Absorbers Refer to Suspension Strut and Shock Absorber Testing - On Vehicle . Are any of the components worn or damaged? | Go to Step 8 | Go to Step 9 |
| 8 | Replace all of the worn or damaged components. For shock absorber replacement, refer to Shock Absorber Replacement (W/F55) or Shock Absorber Replacement (W/F55) . For spring replacement, refer to Front Transverse Spring Replacement or Rear Transverse Spring Replacement . Did you complete the repair? | Go to Step 9 | |
| 9 | Drive the vehicle in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Ride Diagnosis
Vehicle Leads/Pulls
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: At a constant highway speed on a typical straight road, lead/pull is the amount of effort required at the steering wheel to maintain the vehicle straight path. | |||
| 1 | Did you review the General Description and perform the visual/physical inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis |
| 2 | Road test the vehicle in order to verify the complaint. Does the vehicle operate normally? | System OK | Go to Step 3 |
| 3 | Inspect the tire/wheel assemblies for: Correct tire pressure-Refer to the tire placard. Correct tire size-Refer to the tire placard. Abnormal tire wear or damage Did you find and correct the condition? | Go to Step 9 | Go to Step 4 |
| 4 | Perform the Radial Tire Lead/Pull Correction . Did you find and correct the condition? | Go to Step 9 | Go to Step 5 |
| 5 | Inspect and correct/adjust the suspension and steering systems for: Vehicle trim height-Refer to Trim Height Specifications . Excessively worn, loose, or damaged components Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
| 6 | Inspect the brake system for brake drag. With the vehicle suspended on a hoist, brake drag can be identified by rotating each wheel several times and observing whether more force is needed to rotate the left wheel or the right wheel. Refer to Diagnostic Starting Point - Disc Brakes . Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
| 7 | Inspect the wheel alignment and adjust as necessary. Refer to Wheel Alignment Measurement . Did you correct the condition? | Go to Step 9 | Go to Step 8 |
| 8 | Inspect the steering gear for unequal effort. The vehicle must be suspended on a hoist, the engine running, and the transmission in park or neutral. Grasp the tire assembly and manually simulate a turn from the left of center and the right of center observing whether more force is needed to turn to the left or to the right. If this condition exists, replace the steering gear. Did you correct the condition? | System OK | Go to Step 3 |
| 9 | Operate the vehicle in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Vehicle Leads/Pulls
Body Leans or Sways in Corners
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you review the General Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis |
| 2 | Verify the vehicle leans or sways in corners. Does the vehicle operate normally? | System OK | Go to Step 3 |
| 3 | Inspect the transverse leaf springs for wear or damage. Are the springs worn or damaged? | Go to Step 5 | Go to Step 4 |
| 4 | Inspect the stabilizer shaft link for wear or damage. Is the stabilizer shaft link worn or damaged? | Go to Step 6 | Go to Step 2 |
| 5 | Replace the springs. Refer to the appropriate procedure: Rear Transverse Spring Replacement in Rear Suspension Front Transverse Spring Replacement in Front Suspension Did you complete the repair? | Go to Step 7 | |
| 6 | Replace the stabilizer shaft link. Refer to Stabilizer Shaft Link Replacement in Front Suspension. Did you complete the repair? | Go to Step 7 | |
| 7 | Operate the vehicle in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Body Leans or Sways in Corners
Suspension Bottoms
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: A loud bang or thump that can usually be felt and/or heard when the vehicle is driven over bumps. This condition is commonly noticed when the vehicle trim height is too low. | |||
| 1 | Did you review the General Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis |
| 2 | Verify that the suspension bottoms. Does the vehicle operate normally? | System OK | Go to Step 3 |
| 3 | Check for vehicle overloading. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label in General Information. Is the vehicle overloaded? | Go to Step 6 | Go to Step 4 |
| 4 | Inspect the vehicle trim height. Refer to Trim Height Specifications . Is the vehicle trim height incorrect? | Go to Step 7 | Go to Step 5 |
| 5 | Inspect the struts and shock absorbers. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle . Are the components in need of replacement? | Go to Step 8 | Go to Step 9 |
| 6 | Remove the excess weight from the vehicle. Did you remove the excess weight from the vehicle? | Go to Step 9 | |
| 7 | Correct the vehicle trim height. Refer to Trim Height Specifications . Did you complete the repair? | Go to Step 9 | |
| 8 | Replace the components as necessary. Did you complete the repair? | Go to Step 9 | |
| 9 | Operate the vehicle in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Suspension Bottoms
Memory Steer
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: The steering wheel does not return to center after completing a turn. | |||
| 1 | Did you review the General Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis |
| 2 | Verify that memory steer is present. Does the system operate normally? | System OK | Go to Step 3 |
| 3 | Ensure that all of the tires are inflated to the correct pressure. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . Has the inspection/adjustment been performed? | Go to Step 4 | |
| 4 | Lubricate the tie rod ends and the ball joints if applicable. Inspect the suspension system for worn or damaged components. Repair as necessary. Road test the vehicle in order to verify the customer complaint. Does the vehicle still exhibit memory steer? | Go to Step 5 | System OK |
| 5 | Check for proper wheel alignment. Refer to Wheel Alignment Measurement . Adjust as necessary. Road test the vehicle in order to verify the customer complaint. Does the vehicle still exhibit memory steer? | Go to Step 6 | System OK |
| 6 | Raise and support the vehicle. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . Disconnect both of the outer tie rod ends from the steering knuckles. Refer to Rack and Pinion Outer Tie Rod End Replacement . Use your hands in order to move the tie rod ends. Are either of the tie rod ends abnormally difficult to move? | Go to Step 7 | Go to Step 8 |
| 7 | Replace the outer tie rod end(s) as necessary. Refer to Rack and Pinion Outer Tie Rod End Replacement . Did you complete the repair? | Go to Step 14 | |
| 8 | Remove the tire/wheel. Disconnect the lower control arm from the steering knuckle. Use your hands to rotate the ball joint stud. Is the ball joint abnormally difficult to rotate? | Go to Step 9 | Go to Step 10 |
| 9 | Replace the lower control arm. Refer to Lower Control Arm Replacement . Did you complete the repair? | Go to Step 14 | |
| 10 | Raise and support the vehicle. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . Rotate the steering wheel ONE revolution in either direction. Rotate the steering wheel back to the original position. Was the steering wheel abnormally difficult to rotate in either direction? | Go to Step 11 | Go to Step 14 |
| 11 | Disconnect the intermediate shaft. IMPORTANT: Do NOT rotate the steering wheel more than one complete revolution. Note the position of the steering wheel and rotate the steering wheel ONE revolution in either direction. Rotate the steering wheel back to the original position as previously noted. Was the steering wheel abnormally difficult to rotate in either direction? | Go to Step 12 | Go to Step 13 |
| 12 | Repair the steering gear as necessary. Refer to Steering Gear Replacement . Road test the vehicle in order to verify the customer complaint. Did you complete the repair? | Go to Step 14 | |
| 13 | Repair the steering column as necessary. Did you complete the repair? | Go to Step 14 | |
| 14 | Operate the vehicle in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
| IMPORTANT |
|---|
| Do NOT rotate the steering wheel more than one complete revolution. |
Memory Steer
Poor Directional Stability
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: Driver is unable to maintain consistent, predictable vehicle driving control in any direction. | |||
| 1 | Did you review the General Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis |
| 2 | Verify that the directional stability is poor. Does the system operate normally? | System OK | Go to Step 3 |
| 3 | Inspect the stabilizer shaft, links, and insulators for wear or damage. Replace as necessary. Refer to the following in Front Suspension: Stabilizer Shaft Replacement Stabilizer Shaft Link Replacement Stabilizer Shaft Insulator Replacement Does the vehicle still exhibit poor directional stability? | Go to Step 4 | System OK |
| 4 | Inspect the lower control arms, ball joints, and tie rods for wear or damage. Repair as necessary. Refer to Lower Control Arm Replacement in Front Suspension. Refer to Rack and Pinion Outer Tie Rod End Replacement in Power Steering System. Does the vehicle still exhibit poor directional stability? | Go to Step 5 | System OK |
| 5 | Inspect the wheel bearings/hubs for looseness or excessive lateral runout. Refer to Wheel Bearings Diagnosis . Does the vehicle still exhibit poor directional stability? | Go to Step 6 | System OK |
| 6 | Inspect the vehicle trim height. Refer to Trim Height Specifications . Repair as necessary. Does the vehicle still exhibit poor directional stability? | Go to Step 7 | System OK |
| 7 | Inspect and adjust the wheel alignment as necessary. Refer to Wheel Alignment Measurement in Wheel Alignment. Does the vehicle still exhibit poor directional stability? | Go to Step 8 | System OK |
| 8 | Inspect the steering column for looseness. Refer to Looseness in Steering Column in Steering Wheel and Column. Repair as necessary. Did you complete the repair? | Go to Step 9 | |
| 9 | Inspect the steering gear mounting bolts for looseness. Refer to Fastener Tightening Specifications in Power Steering. Inspect the bearing preload adjustment. Refer to Steering Gear Rack Bearing Preload Adjustment - Off Vehicle (Magnasteer) in Power Steering System. Repair as necessary. Did you complete the repair? | Go to Step 10 | |
| 10 | Operate the vehicle in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Poor Directional Stability
Noise Diagnosis - Front Suspension
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: Any noise emitted from the front of the vehicle that is induced by VEHICLE SPEED or DRIVING TERRAIN as related to the front suspension. | |||
| 1 | Did you review the General Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis |
| 2 | IMPORTANT: Compare this vehicle to an identical vehicle in order to determine if the customer's concern is a normal operating characteristic of the vehicle. Attempt to duplicate the noise. Road test the vehicle.Is the front suspension noisy? | Go to Step 3 | System OK |
| 3 | Shift the transmission into Park. Turn the ignition off. Bounce the front of the vehicle in order to duplicate the noise. Is the noise present? | Go to Step 4 | Go to Step 5 |
| 4 | Bounce the front of the vehicle. Use a J 39570 Chassis Ear in order to locate the source of the noise. Repair or replace the suspect component as necessary. Did you complete the repair? | Go to Step 25 | |
| 5 | Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Inspect all of the front suspension components for any damage. Are any components damaged? | Go to Step 6 | Go to Step 7 |
| 6 | Repair any damaged components. Did you complete the repair? | Go to Step 25 | |
| 7 | Inspect the tires for proper inflation. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . Correct the tire inflation pressure as necessary. Inspect the tires for unusual wear. Refer to Tire Diagnosis - Irregular or Premature Wear . Does either tire exhibit unusual tread wear? | Go to Step 8 | Go to Step 10 |
| 8 | Rotate the tires. Refer to Tire Rotation . Road test the vehicle. Is the noise now emitted from the rear of the vehicle? | Go to Step 9 | Go to Step 10 |
| 9 | Replace the tires that are causing the noise. Did you complete the repair? | Go to Step 25 | |
| 10 | Ensure that the ball joints and steering linkage are lubricated, if applicable. Lubricate/replace as necessary. Did you service any components? | Go to Step 25 | Go to Step 11 |
| 11 | Ensure that all of the wheel nuts are tightened to the correct specification. Tighten as necessary. Refer to Fastener Tightening Specifications . Did you tighten any wheel nuts? | Go to Step 25 | Go to Step 12 |
| 12 | Use your hands in order to push and pull the shock. Is the strut loose? | Go to Step 13 | Go to Step 15 |
| 13 | Inspect the shock fasteners for the correct fastener tightening specification. Tighten as necessary. Refer to Fastener Tightening Specifications . Use your hand to push and pull the shock. Is the shock loose? | Go to Step 14 | Go to Step 25 |
| 14 | Replace the loose or worn shock. Refer to Shock Absorber Replacement (W/F55) . Did you complete the repair? | Go to Step 25 | |
| 15 | Use your hands in order to push and pull on the stabilizer shaft. Is the stabilizer shaft loose? | Go to Step 16 | Go to Step 20 |
| 16 | Inspect all of the stabilizer shaft fasteners. Tighten as necessary. Refer to Fastener Tightening Specifications . Use your hands in order to push and pull on the stabilizer shaft. Is the stabilizer shaft loose? | Go to Step 17 | Go to Step 25 |
| 17 | Observe the location of the stabilizer shaft looseness. Is the looseness observed at the stabilizer shaft link? | Go to Step 18 | Go to Step 20 |
| 18 | Replace the stabilizer shaft link. Refer to Stabilizer Shaft Link Replacement . Did you complete the repair? | Go to Step 25 | |
| 19 | Replace the stabilizer shaft insulators and/or brackets. Refer to Stabilizer Shaft Insulator Replacement . Did you complete the repair? | Go to Step 25 | |
| 20 | Inspect the control arms for looseness or movement. Is any looseness or movement observed? | Go to Step 21 | Go to Step 23 |
| 21 | Inspect the control arm fasteners for the correct fastener tightening specification. Refer to Fastener Tightening Specifications . Tighten as necessary. Inspect the control arm for looseness. Is the control arm loose? | Go to Step 22 | Go to Step 25 |
| 22 | Replace any worn or loose control arm bushings. Refer to Lower Control Arm Replacement . Did you complete the repair? | Go to Step 25 | |
| 23 | Inspect the wheel bearings for looseness or noise. Refer to Wheel Bearings Diagnosis . Does either wheel bearing exhibit looseness or noise? | Go to Step 24 | Go to Step 8 |
| 24 | Replace the wheel bearing. Refer to Front Wheel Bearing and Hub Replacement . Did you complete the repair? | Go to Step 25 | |
| 25 | Operate the vehicle in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
| IMPORTANT |
|---|
| Compare this vehicle to an identical vehicle in order to determine if the customer's concern is a normal operating characteristic of the vehicle. |
Noise Diagnosis - Front Suspension
Noise Diagnosis - Rear Suspension
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: Any noise emitted from the rear of the vehicle that is induced by VEHICLE SPEED or DRIVING TERRAIN as related to the rear suspension. | |||
| 1 | Did you review the General Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis |
| 2 | Attempt to duplicate the condition. Road test the vehicle. Did you duplicate the condition? | Go to Step 3 | System OK |
| 3 | Is the noise reactive to vehicle load or speed? | Go to Step 4 | Go to Step 6 |
| 4 | Perform the following Inspections: Inspect and adjust the tire inflation. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . Inspect for unusual tire wear. Refer to Vibration Analysis - Tire and Wheel . Inspect the wheel nuts for looseness. Refer to Fastener Tightening Specifications . Did you find and correct the condition? | Go to Step 10 | Go to Step 5 |
| 5 | Inspect the rear wheel bearings. Refer to Wheel Bearings Diagnosis . Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
| 6 | Bounce the rear of the vehicle in order to duplicate the noise. Did you duplicate the noise? | Go to Step 7 | Go to Step 9 |
| 7 | Raise the vehicle. Refer to Lifting and Jacking the Vehicle . Inspect the rear suspension components for looseness. Refer to Fastener Tightening Specifications . Inspect the rear suspension components for damage and repair as necessary. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
| 8 | Inspect the rear shock absorber. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle . Did you find and correct the condition? | Go to Step 10 | Go to Step 09 |
| 9 | Install the J 39570 Chassis Ear or equivalent. Bounce the rear of the vehicle, using the J 39570 or equivalent, in order to locate the source of the noise. If necessary, road test the vehicle. Repair or replace any defective component as necessary. Did you find and correct the condition? | Go to Step 10 | System OK |
| 10 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Noise Diagnosis - Rear Suspension
Tools Required
J 8001 Dial Indicator
Upper Ball Joint Inspection
- Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/xlr/i-2003-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
- Clean and inspect the ball joint seal for cuts or tears. If the ball joint seal is damaged, replace the steering knuckle. Refer to «Steering Knuckle Replacement»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#front-suspension-system) .
- Support the lower control arm with a floor stand as far outboard as possible and raise the suspension to just below ride height.
- Install J 8001 or a suitable dial indicator in a way to measure vertical lash in the ball joint.
- Apply downward force to the upper control arm and zero the indicator.
- Apply upward force to the upper control arm and check the dial indicator.
- If the dial indicator reading is more than 0.12 mm (0.005 in), replace the steering knuckle. Refer to «Steering Knuckle Replacement»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#front-suspension-system) .
Lower Ball Joint Inspection
- Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/xlr/i-2003-2009/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
- Clean and inspect the ball joint seal for cuts or tears. If the ball joint seal is damaged, replace the lower control arm. Refer to «Lower Control Arm Replacement»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#front-suspension-system__lower-control-arm-replacement) .
- Support the lower control arm with a floor stand as far outboard as possible and raise the suspension to just below ride height.
- Install J 8001 or a suitable dial indicator in a way to measure vertical lash in the ball joint.
- Gently lift or pry the suspension to induce ball joint movement.
- If the dial indicator reading is more than 0.5 mm (0.020 in), replace the lower control arm. Refer to «Lower Control Arm Replacement»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#front-suspension-system__lower-control-arm-replacement) .
Suspension Strut and Shock Absorber Testing - On Vehicle
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you review the General Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis |
| 2 | Verify that the malfunction is present. Does the vehicle operate normally? | System OK | Go to Step 3 |
| 3 | IMPORTANT: A light film of oil on the top portion of the reservoir is normal. Inspect each strut or shock absorber for external fluid leakage.Is the strut or shock absorber leaking? | Go to Step 7 | Go to Step 4 |
| 4 | Inspect the vehicle trim height. Refer to Trim Height Specifications . Is the vehicle trim height correct? | Go to Step 5 | Go to Step 6 |
| 5 | Use your hands in order to lift up and push down each corner of the vehicle 3 times. Remove your hands from the vehicle. Does the vehicle stop bouncing after 2 cycles? | Go to Step 8 | Go to Step 7 |
| 6 | Replace the front spring or the rear spring. Refer to the appropriate procedure: Front Transverse Spring Replacement Rear Transverse Spring Replacement Did you complete the repair? | Go to Step 8 | |
| 7 | Replace the strut or shock absorber. Refer to the appropriate procedure: Shock Absorber Replacement (W/F55) for the Front Suspension Shock Absorber Replacement (W/F55) for the Rear Suspension Did you complete the repair? | Go to Step 8 | |
| 8 | Operate the vehicle in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
| IMPORTANT |
|---|
| A light film of oil on the top portion of the reservoir is normal. |
Suspension Strut and Shock Absorber Testing - On Vehicle
Wheel Bearings Diagnosis
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| 1 | Did you review the General Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Suspension General Diagnosis | |
| 2 | Install the J 39570 Chassis Ear. IMPORTANT: A noise heard during left turns is a good indicator of a noisy right wheel bearing. A noise heard during right turns is a good indicator of a noisy left wheel bearing. Road test the vehicle to verify the location of the noise. Drive the vehicle on a smooth road at a moderate speed range. While driving, turn the wheel to the left and the right to apply loads to each wheel corner. Is the noise present at the wheel bearing? | 48-72 km/h (30-45 mph) | Go to Step 7 | Go to Step 3 |
| 3 | Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the tire and wheel. Refer to Tire and Wheel Removal and Installation . Ensure the wheel drive shaft nut is properly tightened. Refer to Fastener Tightening Specifications . Are the nuts fastened to the correct specified value? | Go to Step 4 | Go to Step 8 | |
| 4 | IMPORTANT: Support the vehicle by the lower control arms or the rear axle to prevent movement during wheel bearing/hub inspection. Mount and secure the J 8001 Dial Indicator to the steering knuckle. Firmly push the hub flange towards the vehicle. Ensure that the dial indicator contacts the vertical surface of the hub as close as possible to the center of the flange. Firmly pull the hub flange away from the vehicle in order to inspect the total travel indicator by the dial indicator. Is the measurement greater then the specified value? | 0.127 mm (0.005 in) | Go to Step 7 | Go to Step 5 |
| 5 | Inspect for tire or wheel damage. Refer to Tire and Wheel Assembly Runout Measurement - On-Vehicle . Did you find and correct the condition? | Go to Step 9 | Go to Step 6 | |
| 6 | Inspect the front and/or rear suspension. Refer to Noise Diagnosis - Front Suspension or Noise Diagnosis - Rear Suspension . Did you find and correct the condition? | Go to Step 9 | Go to Step 2 | |
| 7 | Replace the wheel bearing. Refer to Front Wheel Bearing and Hub Replacement or Rear Wheel Bearing and Hub Replacement . Did you complete the repair? | Go to Step 9 | ||
| 8 | Remove the old wheel drive shaft nut and install a NEW wheel drive shaft nut. Tighten to the specified value. Refer to Fastener Tightening Specifications . Did you complete the repair? | Go to Step 9 | ||
| 9 | Road test the vehicle to verify the repair. Does the vehicle operate normally? | System OK | Go to Step 3 |
| IMPORTANT |
|---|
| A noise heard during left turns is a good indicator of a noisy right wheel bearing. A noise heard during right turns is a good indicator of a noisy left wheel bearing. |
| IMPORTANT |
|---|
| Support the vehicle by the lower control arms or the rear axle to prevent movement during wheel bearing/hub inspection. |
Wheel Bearings Diagnosis
Trim Height Inspection
Tools Required
- J 42743 Trim Height Adjustment Tool. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__special-tools) .
- J 42854 Trim Height Measurement Gage. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__special-tools) .
Trim Height Measurements
Trim height is a predetermined measurement relating to vehicle ride height. Incorrect trim heights can cause bottoming out over bumps, damage to the suspension components and symptoms similar to wheel alignment problems. Check the trim heights when diagnosing suspension concerns and before checking the wheel alignment.
Perform the following before measuring the trim heights
- Set the tire pressures to the pressure shown on the certification label. Refer to «Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label»(/cadillac/xlr/i-2003-2009/remont/hoistjack/#general-information) .
- Check the fuel level. Add additional weight if necessary to simulate a full tank.
- Make sure the rear compartment is empty except for the spare tire.
- Make sure the vehicle is on a level surface, such as an alignment rack.
- Close the doors.
- Close the hood.
- All dimensions are measured vertical to the ground. Trim heights should be within 13 mm (0.5 in) to be considered correct.
Z Height Measurement
| IMPORTANT | The Z height dimension measurement determines the proper ride height for the front end of the vehicle. |
- Lift the front bumper of the vehicle up about 38 mm (1.5 in).
- Gently remove your hands.
- Allow the vehicle to settle into position.
- Repeat this jouncing operation 2 more times for a total of 3 times.
- Measure the distance between the lowest point of the ball joint (2) and the center of the front side of the lower control arm mounting bolt (1), using the J 42854 . See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__special-tools) .
- Push the front bumper of the vehicle down about 38 mm (1.5 in).
- Gently remove your hands.
- Allow the vehicle to rise.
- Repeat the operation for a total of 3 times.
- Measure the Z dimension from both the right and left side.
- The true Z height dimension number is the average of the high and the low measurements. Refer to «Trim Height Specifications»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__trim-height-specifications) .
Z Height Adjustment
- Using J 42743 , adjust the Z trim height by turning the spring adjuster bolt. See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__special-tools) .
- Lower the transverse spring back onto the lower control arm and remove J 42743 . See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__special-tools) .
- Measure the Z trim height again.
- Measure and adjust the front spring adjuster bolt gaps (1) to 2-24 mm (0.078-0.944 in).
D Height Measurement
The D height dimension measurement determines the proper rear end ride height.
- With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.5 in).
- Gently remove your hands. Allow the vehicle to settle into position.
- Repeat the jouncing operation 2 more times for a total of 3 times.
- Use the J 42854 in order to measure the distance between the lowest point of the ball joint (2) and the center of the front side of the lower control arm mounting bolt (1). See «Special Tools»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__special-tools) .
- Manually push the rear of the vehicle down approximately 38 mm (1.5 in), gently remove hands and let the vehicle settle.
- Repeat the above step 2 more times for a total of 3 times.
- Measure both the right and left sides of the vehicle.
- The true D trim height is the average of the high and low measurements. Refer to «Trim Height Specifications»(/cadillac/xlr/i-2003-2009/remont/suspension-front/#suspension-general-diagnosis__trim-height-specifications) .
D Height Adjustment
- Remove the retainers (1) on the top of the spring bolts (2).
- Adjust the D trim height by turning the spring bolt.
- Measure the D trim height again.
- Measure the rear spring stud heights (1), the maximum difference should be 5 mm (0.196 in).
- Install the retainers to the bolts.
- Lower the vehicle.
Special Tools
Special Tools Illustration Tool Number/Description J 8001 Dial Indicator Set J 39570 Chassis Ear J 42743 Trim Height Adjustment Tool J 42854 Trim Height Measurement Gage
See also:
• Diagnostic Starting Point - Vehicle
• General Description
• General Description
• General Description
• Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label
• Radial Tire Lead/Pull Correction
• Diagnostic Starting Point - Electronic Suspension Control
• Shock Absorber Replacement (W/F55)
• Shock Absorber Replacement (W/F55)
• Front Transverse Spring Replacement
• Diagnostic Starting Point - Disc Brakes
• Wheel Alignment Measurement
• Stabilizer Shaft Link Replacement
• Rack and Pinion Outer Tie Rod End Replacement
• Lower Control Arm Replacement
• Looseness in Steering Column
• Fastener Tightening Specifications
• Steering Gear Rack Bearing Preload Adjustment - Off Vehicle (Magnasteer)
• Lifting and Jacking the Vehicle
• Tire Diagnosis - Irregular or Premature Wear
• Tire Rotation
• Fastener Tightening Specifications
• Fastener Tightening Specifications
• Vibration Analysis - Tire and Wheel
• Fastener Tightening Specifications
• Fastener Tightening Specifications
• Tire and Wheel Assembly Runout Measurement - On-Vehicle
• Symptoms - Suspension General Diagnosis
• Ride Diagnosis
• Vehicle Leads/Pulls
• Body Leans or Sways in Corners
• Suspension Bottoms
• Memory Steer
• Poor Directional Stability
• Noise Diagnosis - Front Suspension
• Noise Diagnosis - Rear Suspension
• Suspension Strut and Shock Absorber Testing - On Vehicle
• Wheel Bearings Diagnosis
• Trim Height Specifications
• Special Tools