Hummer H2. Manual - part 373

 

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Hummer H2. Manual - part 373

 

 

HOURMETER INACCURATE OR INOPERATIVE 

Hourmeter Inaccurate or Inoperative 

8

the fuel level sensor while moving the float arm.  

2. Observe both the analog and digital displays on the 

DMM.  

Does the resistance change smoothly across the specified 
range?

40-250 

ohm

Go to 

Diagnostic 

Aids

Go to Step 10

9

Inspect for poor connections at the harness connector of 
the powertrain control module (PCM). Refer to Testing 
for Intermittent Conditions and Poor Connections and 
to Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

-

Go to Step 

13

Go to Step 12

10

Replace the fuel level sensor. Refer to Fuel Level Sensor 
Replacement in Engine Controls- 6.0L (LQ4). 
Did you complete the replacement?

-

Go to Step 

13

-

11

Replace the IPC. Refer to Instrument Panel Cluster 
(IPC) Replacement . 
Did you complete the replacement?

-

Go to Step 

13

-

12

Replace the PCM. Refer to Powertrain Control Module 
(PCM) Replacement in Engine Controls-6.0L (LQ4).Did 
you complete the replacement?

IMPORTANT:

Program the replacement PCM.

-

Go to Step 

13

-

13

1. Use the scan tool in order to clear the PCM DTCs.  

2. Operate the system in order to verify the repair.  

Did you correct the condition?

-

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference:Instrument Cluster Schematics

1

Did you perform the Instrument Cluster 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Instrument Cluster

2

Verify the hourmeter operation. Refer 
to Instrument Panel Cluster (IPC) 
Description and Operation . 
Does the hourmeter operate normally?

Go to Testing for Intermittent 

Conditions and Poor 

Connections in Wiring Systems

Go to Step 3

3

Replace the IPC. Refer to Instrument 
Panel Cluster (IPC) Replacement . 
Did you complete the replacement?

Go to Step 4

-

Operate the system in order to verify 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

INSTRUMENT PANEL CLUSTER (IPC) GAUGES INOPERATIVE 

Instrument Panel Cluster (IPC) Gauges Inoperative 

ODOMETER TRIP/RESET SWITCH INOPERATIVE 

4

the repair. 
Did you correct the condition?

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference:Instrument Cluster Schematics 
DEFINITION: This diagnostic procedure applies only to the serial data gauges located in the instrument 
cluster which include the engine coolant temperature gauge, and the transmission fluid temperature 
gauge.

1

Did you perform the instrument panel 
cluster (IPC) Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Instrument Cluster

2

1. Turn ON the ignition, with the 

engine OFF.  

2. Install a scan tool.  

3. With the scan tool, perform the 

Displays Test in the IPC scan tool 
Output Controls.  

Does the gauge move from 0 to its 
maximum value and back to 0 when you 
perform the Displays Test?

Go to Step 3

Go to Step 4

3

1. Install a scan tool.  

2. Start the engine.  

3. Observe the appropriate 

parameter in the PCM Data list. 
Refer to Scan Tool Data List .  

Does the parameter match the gauge 
display?

Go to Diagnostic System Check 

- Engine Controls in Engine 

Controls - 4.8L, 5.3L, and 6.0L

Go to Step 4

4

Replace the IPC. Refer to Instrument 
Panel Cluster (IPC) Replacement . 
Did you complete the replacement?

Go to Step 5

-

5

1. Use the scan tool in order to clear 

any induced DTCs.  

2. Operate the system in order to 

verify the repair.  

Did you correct the condition?

System OK

Go to Step 2

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

Diagnostic Aids 

Refer to Instrument Panel Cluster (IPC) Description and Operation in order to determine if the condition 
described by the customer concerning the season and trip odometers is normal operation. 

Odometer Trip/Reset Switch Inoperative 

SPEEDOMETER AND/OR ODOMETER INACCURATE OR INOPERATIVE 

Speedometer and/or Odometer Inaccurate or Inoperative 

Step

Action

Yes

No

Schematic Reference:Instrument Cluster Schematics

1

Did you perform the Instrument 
Cluster Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Instrument Cluster

2

1. Turn the ignition ON, with the 

engine OFF.  

2. Press the trip odometer reset 

switch.  

Does the odometer toggle between the 
season odometer, the trip odometer, 
and the hourmeter?

Go to Testing for Intermittent 

Conditions and Poor 

Connections in Wiring Systems

Go to Step 3

3

Replace the IPC. Refer to Instrument 
Panel Cluster (IPC) Replacement . 
Did you complete the replacement?

Go to Step 4

-

4

Operate the system in order to verify 
the repair. 
Did you correct the condition?

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics 
Connector End View Reference: Instrument Panel, Gauges, and Console Connector End Views

1

Did you perform the Instrument Cluster 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Instrument 

Cluster

2

1. Install a scan tool.  

2. Raise the vehicle's drive wheels. Refer to 

Lifting and Jacking the Vehicle in 
General Information.  

3. Start the engine.  

4. Place the transmission into drive for 

automatic transmission or third gear for 
manual transmission.  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

TACHOMETER INACCURATE OR INOPERATIVE 

Tachometer Inaccurate or Inoperative 

5. With the scan tool, observe the Vehicle 

Speed parameter in the IPC Data 1 data list. 

Does the VSS parameter match the speedometer 
display?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

Test the vehicle speed signal circuit for a high 
resistance between the IPC and the PCM. Refer to 
Circuit Testing and Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 6

Go to Step 4

4

Inspect for poor connections at the harness 
connector of the IPC. Refer to Testing for 
Intermittent Conditions and Poor Connections 
and Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

Replace the IPC. Refer to Instrument Panel 
Cluster (IPC) Replacement . 
Did you complete the replacement?

Go to Step 6

-

6

Operate the system in order to verify the repair. 
Did you correct the condition?

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics 
Connector End View Reference: Instrument Panel, Gauges, and Console Connector End Views

1

Did you perform the Instrument Cluster 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Instrument 

Cluster

2

1. Install a scan tool.  

2. Start the engine.  

3. With the scan tool, observe the Engine 

Speed parameter in the IPC Data 1 data list. 

Does the Engine Speed parameter match the 
tachometer display?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

Test the engine speed signal circuit for a high 
resistance between the IPC and PCM. Refer to 
Circuit Testing and Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 6

Go to Step 4

Inspect for poor connections at the harness 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

 

 

 

 

 

 

 

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