Hummer H2. Manual — part 372

ENGINE OIL PRESSURE GAUGE INACCURATE OR INOPERATIVE

Engine Oil Pressure Gauge Inaccurate or Inoperative

7

Repair the open, short to ground or high
resistance in the ignition 1 voltage circuit. Refer
to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you complete the repair?

Go to Step 9

-

8

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

Go to Step 9

-

9

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

System OK

Go to Step 3

Step

Action

Value(s)

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 engine oil pressure (EOP) gauge
display within the specified range?

207-483

kPa (30-

70 psi)

Go to Testing for

Intermittent

Conditions and Poor

Connections in Wiring

Systems

Go to Step 3

3

1. Install a scan tool.

2. Turn the ignition ON, with the engine

OFF.

3. With a scan tool, perform the

Displays Test in the IPC scan tool
Output Controls.

Does the engine oil pressure gauge move up
and down when commanded?

-

Go to Step 4

Go to Step 10

4

1. Turn the ignition OFF.

2. Disconnect the negative battery cable.

3. Disconnect the engine oil pressure

(EOP) sensor

4. Measure the resistance from the low

reference circuit of the EOP sensor to
a good ground.

Does the resistance measure less than the
specified value?

5 ohm

Go to Step 6

Go to Step 5

2004 Hummer H2

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

FUEL GAUGE INACCURATE OR INOPERATIVE

Diagnostic Aids

z

Verify that the fuel level is in the same range as the customer concern.

z

For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in
Wiring Systems.

z

Refer to Fuel Level Specifications in order to verify the correct readings for the fuel level sensor. The
Fuel Tank Level Remaining parameter is available on the scan tool in the powertrain control module
(PCM) Enhanced Evap data list.

5

Test the low reference circuit of the EOP
sensor for high resistance or for an open.
Refer to Circuit Testing and to Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 11

Go to Step 7

6

Inspect for poor connections at the harness
connector of the EOP sensor. 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 11

Go to Step 8

7

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 11

Go to Step 9

8

Replace the EOP sensor. Refer to Engine
Oil Pressure Sensor and/or Switch
Replacement in Engine Mechanical.
Did you complete the replacement?

-

Go to Step 11

-

9

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 11

-

10

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

-

Go to Step 11

-

11

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

Test Description

The numbers below refer to the step numbers on the diagnostic table.

3: This step tests for a high resistance in the signal circuit and the low reference circuit of the fuel level
sensor.

13: DTCs will set in the PCM when you perform this diagnostic table.

Fuel Gauge Inaccurate or Inoperative

Step

Action

Value

(s)

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

2

1. Disconnect C106.

2. Connect the J 33431-C Signal Generator and

Instrument Panel Tester between the signal circuit of
the fuel level sensor and the low reference circuit of
the fuel level sensor on the male terminal side of the
connector. See Special Tools and Equipment .

3. Turn ON the ignition, with the engine OFF.

4. Vary the resistance on the J 33431-C from 40-250

ohm. See Special Tools and Equipment .

5. Refer to Fuel Level Specifications in order to

convert from resistance to fuel gauge display.

Does the fuel gauge display the correct fuel level?

IMPORTANT:

Verify the J 33431-C resistance settings with a
DMM. See Special Tools and Equipment .

-

Go to Step

4

Go to Step 3

1. Install a scan tool.

2. Turn ON the ignition, with the engine OFF.

3. Vary the resistance on the J 33431-C from 40-250

ohm. See Special Tools and Equipment .

4. Refer to Fuel Level Specifications in order to

IMPORTANT:

Verify the J 33431-C resistance settings with a
DMM. See Special Tools and Equipment .

2004 Hummer H2

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

3

convert from resistance to fuel level percentage.

5. With the scan tool, observe the Fuel Tank Level

Remaining parameter in the PCM Enhanced EVAP
Data list.

Does the scan tool display the correct fuel level
percentage?

IMPORTANT:

Turn OFF the ignition momentarily between the
resistance settings in order to quickly update the
scan tool display.

-

Go to Step

11

Go to Step 5

4

Inspect for the following items:

z

A poor connection at the harness connector of the
fuel level sensor. Refer to Testing for Intermittent
Conditions and Poor Connections and to
Connector Repairs in Wiring Systems.

z

A high resistance in the signal circuit of the fuel
level sensor or the low reference circuit of the fuel
level sensor between the fuel level sensor and C106.

z

A misaligned fuel level sender.

z

A deformed fuel tank.

Did you find and correct the condition?

-

Go to Step

13

Go to Step 7

5

Test the signal circuit of the fuel level sensor 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

13

Go to Step 6

6

Test the low reference circuit of the fuel level sensor 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

13

Go to Step 9

7

1. Remove the fuel level sender.

2. Inspect for the following items:

z

The fuel level sensor is stuck, perhaps due to
an interference with the fuel strainer.

z

The fuel tank contains foreign material, for
instance, ice.

Did you find and correct the condition?

-

Go to Step

13

Go to Step 8

1. With the J 39200 DMM, measure the resistance of

2004 Hummer H2

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