Hummer H2. Manual — part 76

7101 Wisconsin Avenue

Bethesda, MD 20814

Phone (301) 634-4955 - Fax (202) 318-0378

January 2002

Map@motorist.org

OVERVIEW OF SERVICE REQUIREMENTS AND SUGGESTIONS

It is MAP policy that all exhaust, brake, steering, suspension, wheel alignment, drive-line, engine performance
and maintenance, and heating, ventilation and air conditioning, and electrical services be offered and performed
under the standards and procedures specified in these sections.

Before any service is performed on a vehicle, an inspection of the appropriate system must be performed. The
results of this inspection must be explained to the customer and documented on an inspection form. The
condition of the vehicle and its components will indicate what services/part replacements may be "Required" or
"Suggested". In addition, suggestions may be made to satisfy the requests expressed by the customer.

When a component is suggested or required to be repaired or replaced, the decision to repair or replace must be
made in the customer's best interest, and at his or her choice given the options available.

This section lists the various parts and conditions that indicate a required or suggested service or part
replacement. Although this list is extensive, it is not fully inclusive. In addition to this list, a technician may
make a suggestion. However, any suggestions must be based on substantial and informed experience, or the
vehicle manufacturer's recommended service interval and must be documented.

Some conditions indicate that service or part replacement is required because the part in question is no longer
providing the function for which it is intended, does not meet a vehicle manufacturer's design specification or is
missing.

Example: An exhaust pipe has corroded severely and has a hole in it through which exhaust gases are leaking.
Replacement of the exhaust pipe in this case is required due to functional failure.

Example: A brake rotor has been worn to the point where it measures less than the vehicle manufacturer's
discard specifications. Replacement of the rotor is required because it does not meet design specifications.

Some conditions indicate that a service or part replacement is suggested because the part is close to the end of
its useful life or addresses a customer's need, convenience or request. If a customer's vehicle has one of these
conditions, the procedure may be only to suggest service.

Example: An exhaust pipe is rusted, corroded or weak, but no leaks are present. In this case, the exhaust pipe
has not failed. However, there is evidence that the pipe may need replacement in the near future. Replacement
of the pipe may be suggested for the customer's convenience in avoiding a future problem.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards BRAKE SYSTEMS

Example: The customer desires improved ride and/or handling, but the vehicle's shocks or struts have not failed.
In this case, replacement may be suggested to satisfy the customer's wishes. In this case, replacement of the
shocks or struts may not be sold as a requirement.

A customer, of course, has the choice of whether or not a shop will service his or her vehicle. He or she may
decide not to follow some of your suggestions. When a repair is required , a MAP shop must refuse partial
service on that system if, in the judgment of the service provider, proceeding with the work could create or
continue an unsafe condition. When a procedure states that required or suggested repair or replacement is
recommended, the customer must be informed of the generally acceptable repair/replacement options whether
or not performed by the shop.

When presenting suggested repairs to the customer, you must present the facts, allowing the customer to draw
their own conclusions and make an informed decision about how to proceed.

The following reasons may be used for required and suggested services. These codes are shown in the "Code"
column of the MAP Uniform Inspection & Communications Standards that follow:

Reasons to Require Repair or Replacement

A - Part no longer performs intended purpose

B - Part does not meet a design specification (regardless of performance)

C - Part is missing

Reasons to Suggest Repair or Replacement

1 - Part is close to the end of its useful life (just above discard specifications, or weak; failure likely to
occur soon, etc.)

2 - To address a customer need, convenience, or request (to stiffen ride, enhance performance, eliminate
noise, etc.)

3 - To comply with maintenance recommended by the vehicle's Original Equipment Manufacturer (OEM)

4 - Technician's recommendation based on substantial and informed experience

SERVICE PROCEDURES REQUIRED AND SUGGESTED FOR PROPER
VEHICLE OPERATION

Some states may have specifications that differ from OEM. Check your local/state regulations. Where state or
local laws are stricter, they take precedence over these guidelines.

NOTE:

When a repair is required , the shop must refuse partial service to the system in
question, if the repair creates or continues an unsafe condition.

NOTE:

Suggested services are always optional. When presenting suggested repairs to
the customer, you must present the facts, allowing the customer to draw their
own conclusions and make an informed decision about how to proceed.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards BRAKE SYSTEMS

ACCELEROMETERS (G SENSOR OR LATERAL)

Accelerometers (G Sensor or Lateral)

ACCUMULATORS

Accumulators

ANCHOR PINS

See Backing Plates.

ANTI-LOCK BRAKE SYSTEMS

Anti-lock brake systems are commonly referred to as "ABS" and will be referred to as "ABS" throughout these
guidelines. Some ABS components also function as part of a traction control system (TCS).WARNING: When
diagnosing and servicing high pressure components, observe safety procedures and equipment requirements
established by the vehicle manufacturer to reduce the possibility of serious personal injury.

Electro-magnetic interference (EMI) may be caused by incorrect installation of accessories or components. EMI
can result in improper system operation.

BACKING PLATES

Condition

Code

Procedure

Broken

A

Require replacement.

Connector loose

A

Require repair or replacement.

Loose

B

Require repair or replacement.

Missing

C

Require replacement.

Out of position

B

Require re-positioning to vehicle manufacturer's

specifications.

Output signal
incorrect

B

Require replacement.

Condition

Code

Procedure

Leaking

B

Require replacement.

Missing

C

Require replacement.

Pre-charge incorrect

B

Require replacement.

NOTE:

Anti-lock brakes are an integral part of the brake system. It is essential that the
anti-lock brakes function properly when brake service is performed.

NOTE:

Intermittent electrical conditions are often caused by a loss of ground, poor
connection, or water intrusion into the wiring harness.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards BRAKE SYSTEMS

Backing Plates

BRAKE FLUID

DOT 3, DOT 4, and DOT 5.1 brake fluids are clear or light amber in color. DOT 5 brake fluid is violet in color.
Correct fluid required for the brake system is stamped on the master cylinder cover.

Brake Fluid

Condition

Code

Procedure

Anchor pin bent

B

Require repair or replacement.

Anchor pin broken

A

Require replacement.

Anchor pin worn, affecting structural integrity

B

Require replacement.

Backing plate bent

B

Require repair or replacement.

Backing plate broken

A

Require replacement.

Backing plate cracked

B

Require repair or replacement.

Corroded, affecting structural integrity

A

Require replacement.

Loose

B

Require repair or replacement.

Missing

C

Require replacement.

Shoe lands worn

A

Require repair or replacement.

CAUTION: Most manufacturers prohibit the use of DOT 5 brake fluid in a system

equipped with ABS.

Condition

Code

Procedure

Beyond service interval

3

Suggest flushing and refilling with

correct fluid.

Brake fluid type incorrect

B

Require flushing and refilling with

correct fluid. See note below.

NOTE: For example, DOT fluid lower than specified for the vehicle or silicone brake
fluid (DOT 5 or 5.1) in an ABS system.

Contaminated, for example, fluid other
than brake fluid present

A or B

Require service. See note below.

NOTE: If a fluid other than brake fluid is present in the brake system which DOES
affect the rubber parts, the required service is to: 1) remove all components having
rubber parts from the system, 2) flush lines with denatured alcohol or brake cleaner, 3)
repair or replace all components having rubber parts, and 4) flush and fill with correct
brake fluid. (Code A)
NOTE: If a fluid other than brake fluid is present in the brake system which DOES NOT
affect the rubber parts, the required service is to flush and fill with the correct brake
fluid. (Code B)

Hydraulic component overhaul or
replacement

3

Suggest flushing and refilling with

correct fluid.

Rubber master cylinder cover gasket

A

Require replacement of gasket. See

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards BRAKE SYSTEMS