For 1990-2009 cars

#### 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 | 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 7
4 | Inspect the tires for the following condition:

• | Proper tire inflation and adjust as necessary. Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication.

• | Unusual tire wear--Refer to Vibration Analysis - Tire and Wheel in Vibration Diagnosis and Correction.

• | Inspect the wheel nuts for looseness and tighten as necessary. Refer to Fastener Tightening Specifications in Tires and Wheels.

Did you find and correct the condition?

Go to Step 14

Go to Step 5

5 | Inspect the front wheel bearings. Refer to Wheel Bearings Diagnosis . Did you find and correct the condition? | Go to Step 14 | Go to Step 6
6 | Inspect for transaxle noises. Refer to Symptoms - Automatic Transmission in Automatic Transaxle-4T40-E/4T45-E. Did you find and correct the condition? | Go to Step 14 | Go to Step 7
7 | Bounce the front of the vehicle in order to duplicate the noise. Did you duplicate the noise? | Go to Step 8 | Go to Step 9
8 |

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Inspect the front suspension components for looseness. Refer to Fastener Tightening Specifications in Front Suspension.
3. Inspect the front suspension components for damage and repair as necessary.

Did you find and correct the condition?

Go to Step 14

Go to Step 9

9 |

1. Install the J 39570 Chassis Ear or equivalent.
2. Bounce the front of the vehicle, using the J 39570 or equivalent in order to locate the source of the noise. If necessary road test the vehicle.
3. Repair or replace any damaged components as necessary.

Did you find and correct the condition?

Go to Step 14

Go to Step 10

10 | Inspect the ball joints and steering components for the following conditions.

• | Lack of lubrication where applicable

• | Looseness in the ball joints--Refer to Ball Joint Inspection .

• | Looseness in the tie rods--Refer to Rack and Pinion Outer Tie Rod End Replacement or Tie Rod Replacement - Inner - On Vehicle in Power Steering System.

Did you find and correct the condition?

Go to Step 14

Go to Step 11

11 | Inspect for damaged shock absorbers. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle . Did you find and correct the condition? | Go to Step 14 | Go to Step 12
12 | Inspect the front stabilizer shaft and stabilizer shaft links for damage and repair as necessary. Refer to Stabilizer Shaft Replacement or Stabilizer Shaft Link Replacement in Front Suspension. Did you find and correct the condition? | Go to Step 14 | Go to Step 13
13 | Inspect for control arm damage and repair as necessary. Refer to Lower Control Arm Replacement in Front Suspension. Did you find and correct the condition? | Go to Step 14 | --
14 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3