Hummer H2. Manual — part 2658
SERVICE INDICATOR ALWAYS ON
Circuit Description
The Service 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and
ground of the IPC. The transfer case shift control module controls the Service indicator by sending the IPC a
Class 2 message. This indicator may be controlled with the scan tool using the IPC device controls.
Test Description
The number below refers to the step number on the diagnostic table.
2: This step determines whether the failure is the result of a malfunctioning transfer case shift control
module or the IPC.
Service Indicator Always On
SERVICE INDICATOR INOPERATIVE
Circuit Description
The Service 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and
ground of the IPC. The transfer case shift control module controls the Service indicator lamp by sending the
IPC a Class 2 message. This lamp may be controlled with the scan tool using the IPC device controls.
Test Description
Step
Action
Yes
No
Schematic Reference: Transfer Case Control Schematics
Connector End View Reference: Transfer Case Control Connector End Views
1
Did you perform the Diagnostic System Check - Transfer
Case?
Go to
Step 2
Go to Diagnostic System
Check - Transfer Case
2
In the IPC Data List, observe the Service 4WD input/output.
Is the Service 4WD indicator commanded ON?
Go to
Step 3
Go to Step 4
3
Replace the transfer case shift control module. Refer to
Transfer Case Shift Control Module Replacement .
Did you complete the repair?
Go to
Step 5
-
4
Replace the instrument panel cluster. Refer to Instrument
Panel Cluster (IPC) Replacement in Instrument Panel,
Gauges, and Console.
Did you complete the repair?
Go to
Step 5
-
5
1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle in order to determine if the symptom
has been corrected.
Is the symptom still present?
Go to
Step 1
System OK
2004 Hummer H2
2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2
The number below refers to the step number on the diagnostic table.
2: This step determines whether the failure is the result of a faulty transfer case shift control module or
the IPC.
Service Indicator Inoperative
TRANSFER CASE POPPING NOISE
Transfer Case Popping Noise
TRANSFER CASE WHINE OR RUMBLE NOISE
Transfer Case Whine or Rumble Noise
Step
Action
Yes
No
Schematic Reference: Transfer Case Control Schematics
Connector End View Reference: Transfer Case Control Connector End Views
1
Did you perform the Diagnostic System Check - Transfer
Case?
Go to
Step 2
Go to Diagnostic System
Check - Transfer Case
2
In the IPC Data List, observe the Service 4WD input/output.
Is the Service 4WD indicator commanded ON?
Go to
Step 4
Go to Step 3
3
Replace the transfer case shift control module. Refer to
Transfer Case Shift Control Module Replacement .
Did you complete the repair?
Go to
Step 5
-
4
Replace the instrument panel cluster. Refer to Instrument
Panel Cluster (IPC) Replacement in Instrument Panel,
Gauges, and Console.
Did you complete the repair?
Go to
Step 5
-
5
1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle in order to determine if the symptom
has been corrected.
Is the symptom still present?
Go to
Step 1
System OK
Cause
Correction
DEFINITION: A faulty internal transfer case component that causes a popping noise in the transfer case.
Review the Symptoms - Transfer Case and perform the necessary inspections.
Chain
jump
z
Replace the chain and sprockets. Refer to Transfer Case Disassemble and Transfer
Case Assemble .
z
Replace the shaft bearings. Refer to Transfer Case Disassemble and Transfer Case
Assemble .
z
Inspect for damaged components caused by metal debris. Refer to Transfer Case
Disassemble and Transfer Case Assemble .
Cause
Correction
2004 Hummer H2
2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2
TRANSFER CASE GROWL OR GRINDING NOISE
Transfer Case Growl or Grinding Noise
DEFINITION: A faulty internal transfer case component that causes a whine noise in the transfer case.
Review the Symptoms - Transfer Case and perform the necessary inspections.
Faulty
bearings
1. Inspect all of the bearings and journals. Refer to Cleaning and Inspection .
2. Replace any faulty bearings and any components with faulty bearing journals. Refer
to Transfer Case Disassemble and Transfer Case Assemble .
Cause
Correction
DEFINITION: A faulty internal transfer case component that causes a growl or grinding noise in the
transfer case while the vehicle is turning.
Review the Symptoms - Transfer Case and perform the necessary inspections.
High/low planetary
carrier assembly
1. Inspect the high/low planetary carrier pinion gears for the following
conditions:
z
Chipped, bent or deformed teeth
z
Pinion gear needle bearing worn
z
Pinion gear thrust washers missing
z
Seized or binding pinion gears
Refer to Cleaning and Inspection .
2. Inspect the high/low planetary carrier input gear for excessive thrust end
play.
3. Inspect the input gear teeth for excessive wear or damage.
4. Replace the high/low planetary carrier assembly if any of the above
conditions exist. Refer to Transfer Case Disassemble and Transfer Case
Assemble .
Annulus gear
1. Inspect the annulus gear for teeth damage or wear. Refer to Cleaning and
Inspection .
2. Replace the annulus gear if it is faulty. Refer to Transfer Case
Disassemble and Transfer Case Assemble .
Planetary differential
1. Inspect the planetary differential pinion gears for the following conditions:
z
Chipped, bent or deformed teeth
z
Pinion gear bushings worn
z
Pinion gear thrust washers missing
z
Seized or binding pinion gears
Refer to Cleaning and Inspection .
2. Inspect the planetary differential for deformation. Refer to Cleaning and
2004 Hummer H2
2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2
TRANSFER CASE CLUNK IN 4HI LOCK
Transfer Case Clunk in 4HI Lock
Inspection .
3. Replace the planetary differential assembly if it is faulty. Refer to
Transfer Case Disassemble and Transfer Case Assemble .
Sun gears
1. Inspect the sun gears for the following conditions:
z
Gear tooth failure
z
Worn or galled thrust surfaces
Refer to Cleaning and Inspection .
2. Replace the sun gears if they are faulty. Refer to Transfer Case
Disassemble and Transfer Case Assemble .
Thrust washers
1. Inspect the thrust washers for seizure to the planetary differential.
2. Inspect the thrust washers for galling.
3. Replace the thrust washers if they are faulty and the mating component if
it is damaged. Refer to Transfer Case Disassemble and Transfer Case
Assemble .
Planetary differential
not timed properly
1. Inspect the planetary differential for being timed properly. Refer to
Transfer Case Assemble .
2. Properly time the planetary differential gears. Refer to Transfer Case
Assemble .
Cause
Correction
DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer case while in
the 4HI Lock range only.
Review the Symptoms - Transfer Case and perform the necessary inspections.
Incorrect fluid level or
incorrect fluid
1. Inspect the transfer case for the correct fluid level. Refer to Transfer
Case Fluid Replacement .
2. Inspect the transfer case for the correct type of fluid.
3. Flush the transfer case and fill with the correct fluid, if required.
Refer to Capacities - Approximate Fluid .
Worn high speed teeth on
the range sleeve
1. Inspect for worn high speed teeth on the range sleeve. Refer to
Cleaning and Inspection .
2. Replace the range sleeve if it is faulty. Refer to Transfer Case
Disassemble and Transfer Case Assemble .
Worn or missing input gear
thrust washer
Replace the worn or missing input gear thrust washer. Refer to Transfer
Case Disassemble and Transfer Case Assemble .
Worn or faulty planetary
differential
1. Inspect the planetary differential for the following conditions:
z
Loose planetary differential splines to mainshaft splines
2004 Hummer H2
2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2
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