Hummer H2. Manual — part 2184

2004 SUSPENSION

Suspension General Diagnosis - Hummer H2

SPECIFICATIONS

TRIM HEIGHT SPECIFICATIONS

Trim Height Specifications

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - SUSPENSION GENERAL DIAGNOSIS

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.

SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS

1. 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
- Air Suspension in Air Suspension

2. Review the system description and operation in order to familiarize yourself with the system functions.

Refer to the appropriate description and operation:

z

General Description in Front Suspension

z

General Description in Rear Suspension

z

General Description in Tires and Wheels

Visual/Physical Inspection

z

Inspect for aftermarket devices which could affect the operation of any of the Suspension subsystems.

z

Inspect the easily accessible or visible system components for obvious damage or conditions which could
cause the symptom.

z

Inspect for proper tire size and inflation pressure. Refer to Label - Vehicle Certification (w/o RPO Z49)

Suspension

Z Height

D Height

Trim Height must be verified and adjusted before aligning the vehicle.

With RPO ZM6

122 mm (4.8 in) +/-6 mm (0.24 in )

132 mm (5.2 in) +/-6 mm (0.24 in )

Without RPO ZM6

122 mm (4.8 in) +/-6 mm (0.24 in )

140 mm (5.5 in) +/-6 mm (0.24 in )

IMPORTANT: The following steps must be completed before using the symptom tables.

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

or Label - Vehicle Certification (w/RPO Z49) in General Information.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

z

Ride Diagnosis

z

Vehicle Leads/Pulls

z

Body Leans or Sways in Corners

z

Suspension Bottoms

z

Memory Steer

z

Poor Directional Stability

z

Noise Diagnosis - Front Suspension

z

Noise Diagnosis - Rear Suspension

z

Struts or Shock Absorbers On-Vehicle Testing

z

Wheel Bearings Diagnosis

z

Radial Tire Lead/Pull Correction

RIDE DIAGNOSIS

Ride Diagnosis

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 ride is too soft or too hard.Does the vehicle ride
normally?

IMPORTANT:

Verify the vehicle suspension package RPO.

System

OK

Go to Step 3

3

Check the tire inflation and adjust to specifications. Refer to Tire
Inflation Pressure Specifications in Maintenance and
Lubrication.
Did you adjust the tire pressure?

Go to

Step 7

Go to Step 4

4

Inspect the vehicle trim height. Refer to Trim Height Inspection
Procedure .
Did you find and correct the condition?

Go to

Step 7

Go to Step 5

5

Inspect the following suspension components for wear or damage.

z

The strut and shock absorbers. Refer to Struts or Shock
Absorbers On-Vehicle Testing .

z

The torsion bars and springs. Refer to Torsion Bar
Replacement in Front Suspension, Coil Spring

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

VEHICLE LEADS/PULLS

Vehicle Leads/Pulls

Replacement in Rear Suspension or Air Spring
Replacement in Air Suspension.

Did you find and correct the condition?

Go to

Step 7

Go to Step 6

6

If equipped with the Air Suspension system refer to Diagnostic
System Check - Air Suspension in Air Suspension.
Did you find and correct a condition?

Go to

Step 7

System OK

7

Drive the vehicle in order to verify the repair.
Did you correct the condition?

System

OK

Go to Step 3

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's 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:

z

Correct tire pressure-Refer to the tire placard.

z

Correct tire size-Refer to the tire placard.

z

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 in Tires and Wheels.
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:

z

Vehicle trim height-Refer to Trim Height Specifications .

z

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 need to rotate the left wheel
or the right wheel. Refer to Diagnostic Starting Point - Disc Brakes in

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2

BODY LEANS OR SWAYS IN CORNERS

Body Leans or Sways in Corners

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
Measuring Wheel Alignment in Wheel Alignment.
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

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 following components for wear or
damage:

z

The rear coil springs

z

The torsion bars

Are the components 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:

z

Coil Spring Replacement in Rear Suspension

z

Torsion Bar Replacement in Front
Suspension

Did you complete the repair?

Go to

Step 7

-

Replace the stabilizer shaft link. Refer to the
appropriate procedure:

2004 Hummer H2

2004 SUSPENSION Suspension General Diagnosis - Hummer H2