Hummer H2. Manual - part 1506

1

Did you perform the Inspection/Maintenance (I/M) 
System Check?

Go to Step 2

Go to 

Inspection/Maintenance 

(I/M) System Check

2

1. Ensure the vehicle is within the Conditions for 

Running specified in the supporting text.  

2. Turn OFF all of the accessories, including the 

A/C and the blower fan. 

3. Start and idle the engine. 

4. Acceleration at part throttle to 72 km/h (45 

mph) with this speed maintained until the 
engine reaches operating temperature. This 
may be up to 8-10 minutes, depending on the 
startup coolant temperature.  

5. Continue the operating conditions for an 

additional 3 minutes after the engine reaches 
the operating temperature.  

6. Decelerate to 0 km/h (0 mph).  

7. Idle the engine for 2 minutes.  

8. Turn OFF the ignition for 1 hour.  

9. After 1 hour, turn ON the ignition.  

10. Observe the EVAP System Status with a scan 

tool.  

Did the EVAP System Status update to YES?

IMPORTANT:

Once the engine is started, DO NOT turn the 
engine OFF for the remainder of the 
procedure until the test is complete.

CAUTION:

Refer to Road Test Caution in Cautions and 
Notices.

IMPORTANT:

In order for this test to run, the vehicle must 
operate in the following conditions:

Go to Step 5

Go to Step 3

3

Observe the DTC Information with a scan tool. 
Does the scan tool indicate any failed DTCs?

Go to 

Diagnostic 

Trouble Code 

(DTC) List

Go to Step 4

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Troubleshooting) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

INSPECTION/MAINTENANCE (I/M) HEATED OXYGEN SENSOR/OXYGEN SENSOR (HO2S/O2S) 
SYSTEM SET PROCEDURE 

Description 

The purpose of this test is to satisfy the enable criteria necessary to execute inspection/maintenance (I/M) 
readiness diagnostics for the oxygen sensor (O2S, HO2S) system. The test may be used to set the I/M System 
Status to YES. The I/M System Status display on the scan tool provides an indication of whether the control 
module has completed the required tests. The I/M System Status does not indicate that the tests have passed or 
failed. When all of the diagnostics for a specific system have run and passed, the I/M System Status will update 
to YES. If a test for a specific system has failed, the I/M System Status will update to YES, indicating a 
determination was made, even if all of the other tests for that system have not run. 

Conditions for Running 

z

DTCs P0133, P0135, P0136, P0140, P0141, P0153, P0155, P0156, P0160, P0161, P1133, P1134, P1153, 
P1154 are not set.  

z

The fuel level is more than 10 percent. 

4

1. Refer to Inspection/Maintenance (I/M) 

System DTC Table to determine which DTCs 
are required to run in order to complete this 
test.  

2. Observe the Not Ran Since Code Cleared 

display with a scan tool.  

3. Determine which of the DTCs required for a 

YES status has not run.  

4. Enter the DTC number in the Specific DTC 

menu of the scan tool.  

5. Operate the vehicle within the Conditions for 

Running the DTC, located in the supporting 
text for the diagnostic table of the DTC.  

6. Repeat the procedure until the scan tool 

indicates the diagnostic test has run.  

7. Repeat steps 4-6 for any additional required 

DTCs that have not run.  

8. Observe the I/M System Status display with a 

scan tool.  

Did the EVAP System Status update to YES?

Go to Step 5

Go to Diagnostic Aids

5

Observe the Emission Related DTC portion of the 
I/M System Status display with a scan tool. 
Does the scan tool indicate any Emission Related 
DTCs set?

Go to 

Diagnostic 

Trouble Code 

(DTC) List

System OK

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Troubleshooting) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

z

The engine coolant temperature (ECT) is more than 60°C (140°F).  

z

The engine is running in Closed Loop fuel control.  

z

The engine has been running for more than 3 minutes.  

z

The battery voltage is between 10-18 volts.  

z

The mass air flow (MAF) is between 20-55 grams per second.  

z

The engine speed is between 1,200-3,000 RPM.  

z

The throttle position (TP) sensor is more than 5 percent.  

Diagnostic Aids 

If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the 
set procedure. If the test does not run after numerous attempts and no DTC is set, review the appropriate scan 
tool data list and the service information for an indication of why the test does not complete. Some tests may 
abort due to changes in the conditions while the test is running. For example, changes in engine load such as a 
cooling fan or A/C compressor clutch turning ON may cause the test to abort. 

Inspection/Maintenance (I/M) Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure

Step

Action

Yes

No

1

Did you perform the Inspection/Maintenance (I/M) 
System Check?

Go to Step 2

Go to 

Inspection/Maintenance 

(I/M) System Check

2

1. Ensure the vehicle is within the Conditions 

for Running specified in the supporting text. 

2. Turn OFF all of the accessories, e.g., A/C, 

blower fan, etc.  

3. Start the engine and allow it to idle for 1 

minute. 

4. Acceleration at part throttle to 75-90 km/h 

(45-55 mph) with this speed maintained for 
6 minutes or until the I/M System Status 
updates to YES. 

Manual transmissions, either 5 or 6 speed, 
may require operation in 4th or 5th gear 

CAUTION:

Refer to Road Test Caution in Cautions 
and Notices.

IMPORTANT:

In order for this test to run, the vehicle 
must operate in the following conditions:

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Troubleshooting) - 4.8L, 5.3L, and 6.0L - Hummer H2

  

INSPECTION/MAINTENANCE (I/M) HEATED OXYGEN SENSOR (HO2S) HEATER SYSTEM SET 
PROCEDURE 

Description 

The purpose of this test is to satisfy the enable criteria necessary to execute inspection/maintenance (I/M) 
readiness diagnostics for the heated oxygen sensor (HO2S) heater system. The test may be used to set the I/M 

respectively, in order for this test to run. 

5. Review the I/M System Status display with 

a scan tool.  

Did the HO2S/O2S System Status update to YES?

Go to Step 5

Go to Step 3

3

Observe the DTC Information with a scan tool. 
Does the scan tool indicate any failed DTCs?

Go to 

Diagnostic 

Trouble Code 

(DTC) List

Go to Step 4

4

1. Refer to the Inspection/Maintenance (I/M) 

System DTC Table to determine which 
DTCs are required to run in order to 
complete this test.  

2. Observe the Not Ran Since Code Cleared 

display with a scan tool.  

3. Determine which of the DTCs required for a 

YES status has not run.  

4. Enter the DTC number in the Specific DTC 

menu of the scan tool.  

5. Operate the vehicle within the Conditions 

for Running the DTC, located in the 
supporting text for the diagnostic table of 
the DTC.  

6. Repeat the procedure until the scan tool 

indicates the diagnostic test has run.  

7. Repeat steps 4-6 for any additional required 

DTCs that have not run.  

8. Observe the I/M System Status display with 

a scan tool.  

Did the HO2S/O2S System Status update to YES?

Go to Step 5

Go to Diagnostic Aids

5

Observe the Emission Related DTC portion of the 
I/M System Status display with a scan tool. 
Does the scan tool indicate any Emission Related 
DTCs set?

Go to 

Diagnostic 

Trouble Code 

(DTC) List

System OK

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Troubleshooting) - 4.8L, 5.3L, and 6.0L - Hummer H2