Hummer H2. Manual — part 374
VOLT GAUGE INACCURATE OR INOPERATIVE
Volt Gauge Inaccurate or Inoperative
4
connector of the instrument cluster. 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
1
Did you perform the Diagnostic System
Check - Vehicle?
Go to Step 2
Go to Diagnostic
System Check -
Instrument Cluster
2
1. Turn the ignition ON, 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. With the scan tool, observe the
Battery Voltage parameter in the
BCM Data list.
Does the Battery Voltage parameter
match the gauge display?
Go to Testing for Intermittent
Conditions and Poor
Connections in Wiring Systems
Go to Step 4
4
Replace the instrument panel cluster
(IPC). Refer to Instrument Panel
Cluster (IPC) Replacement .
Did you complete the replacement?
Go to Step 5
-
1. Use the scan tool in order to clear
any induced DTCs.
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2
CHANGE ENGINE OIL INDICATOR ALWAYS ON
Change Engine Oil Indicator Always On
LOW ENGINE OIL LEVEL INDICATOR ALWAYS ON
Low Engine Oil Level Indicator Always On
5
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
Start the engine.
Does the CHANGE ENGINE OIL indicator
illuminate in the Driver Information Center?
Go to
Step 3
Go to Testing for Intermittent
Conditions and Poor Connections in
Wiring Systems
3
1. Install a scan tool.
2. With the scan tool, observe the Engine Oil
Life Remaining parameter in the PCM
Engine Data 2 data list.
Does the Engine Oil Life Remaining parameter
display 0%?
Go to
Step 4
Go to Step 5
4
Reset the engine oil life. Refer to GM Oil Life
System - Resetting in Maintenance and
Lubrication.
Does the CHANGE ENGINE OIL indicator turn
off?
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
1
Did you perform the instrument panel cluster (IPC)
Diagnostic System Check?
Go to
Step 2
Go to Diagnostic System
Check - Instrument Cluster
1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With the scan tool, observe the Engine Oil Level
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2
2
Switch parameter in the powertrain control module
(PCM) Engine Data 2 data list.
Does the Engine Oil Level Switch parameter display Ok?
Go to
Step 3
Go to Step 4
3
Does the CHECK ENG OIL LEVEL indicator remain
illuminated after the displays test?
Go to
Step 11
Go to Testing for
Intermittent Conditions
and Poor Connections in
Wiring Systems
4
1. Turn OFF the ignition.
2. Disconnect the engine oil level switch.
3. Connect a 3-ampere fused jumper between the
signal circuit of the engine oil level switch and a
good ground.
4. Turn ON the ignition, with the engine OFF.
5. With the scan tool, observe the Engine Oil Level
Switch parameter.
Does the Engine Oil Level Switch parameter display Ok?
Go to
Step 6
Go to Step 5
5
Test the signal circuit of the engine oil level switch for a
short to battery voltage, for an open or for a high
resistance. Refer to Circuit Testing and to Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?
Go to
Step 12 Go to Step 8
6
Test the ground circuit of the engine oil level switch for an
open or for a high resistance. Refer to Circuit Testing and
to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to
Step 12 Go to Step 7
7
Inspect for poor connections at the harness connector of
the engine oil level switch. 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 12 Go to Step 9
8
Inspect for poor connections at the harness connector of
the 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 12 Go to Step 10
9
Replace the engine oil level switch. Refer to Engine Oil
Level Sensor and/or Switch Replacement in Engine
Mechanical.
Did you complete the replacement?
Go to
Step 12 -
10
IMPORTANT:
Program the replacement PCM.
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2
DRIVER INFORMATION CENTER (DIC) SWITCH(ES) INOPERATIVE
Driver Information Center (DIC) Switch(es) Inoperative
Replace the PCM. Refer to Powertrain Control Module
(PCM) Replacement in Engine Controls-6.0L (LQ4).Did
you complete the replacement?
Go to
Step 12 -
11
Replace the IPC. Refer to Instrument Panel Cluster
(IPC) Replacement .
Did you complete the replacement?
Go to
Step 12 -
12
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 driver information center
(DIC) Diagnostic System Check?
Go to Step 2
Go to Diagnostic
System Check -
Driver Information
Systems
2
1. Install a scan tool.
2. Turn ON the ignition, with the engine
OFF.
3. Press and release each of the DIC
switches.
4. With a scan tool, observe the DIC Switch
parameters in the instrument panel cluster
(IPC) Input/Output data list.
Does the scan tool display ON when each switch
is pressed and OFF when each switch is
released?
Go to Testing for
Intermittent Conditions
and Poor Connections in
Wiring Systems
Go to Step 3
3
Does the scan tool display OFF when each
switch is pressed?
Go to Step 9
Go to Step 4
4
Does the scan tool always display ON for the
suspect switch even when the switch is released?
Go to Step 5
Go to Step 6
5
1. Turn OFF the ignition.
2. Disconnect the DIC switch connector.
3. Turn ON the ignition, with the engine
OFF.
4. With a scan tool, observe the suspect DIC
Switch parameter.
Does the scan tool display ON for the suspect
switch?
Go to Step 7
Go to Step 12
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2
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