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