Hummer H2. Manual - part 1514

TR Switch  

This parameter indicates the current state of the gear select switch on the transmission/transaxle as 
calculated by the control module based on the TR switch. The scan tool status will switch from High to 
Low as different combinations are met. On the scan tool in Park, the PRNDL would read P and A will be 
Low, and B and C will be High. 

Traction Control Signal  

This parameter displays the current status of the traction control system. The scan tool will display 
ACTIVE if the traction control system is operating. The scan tool will display INACTIVE if the traction 
control system is not requested because of a wheel slippage condition. 

Vehicle Speed Sensor  

This parameter indicates the vehicle speed calculated by the control module based on an input from the 
vehicle speed sensor (VSS). The scan tool will display a high value at higher vehicle speeds, and a low 
value at lower vehicle speeds. 

VTD Auto Learn Timer  

The scan tool displays Active/Inactive. This parameter indicates if the control module is ready to learn the 
theft deterrent password. The scan tool will display active if the system is ready to learn. The scan tool 
will display inactive if the system has timed out or is not ready to learn the password. 

VTD Fuel Disable  

This parameter Indicates if the VTD module has received proper information to enable or disable fuel. 
The scan tool will display Active or Inactive. The scan tool will display Active if the control module does 
not receive the correct password from the BCM. The scan tool will display Inactive if the control module 
receives the correct password from the BCM. If the system is Active, the engine will not start. 

VTD Fuel Disable Until Ignition Off  

The scan tool displays Yes or No. With the ignition ON and a VTD code present, the scan tool displays 
Yes. 

Warm-ups w/o Emission Faults  

The scan tool displays in counts. This parameter counts the number of warm up cycles without an 
emission fault present. The parameter increments until a fault occurs. If a fault occurs, the counter reverts 
to 0 until the fault is corrected. Clearing information with a scan tool or a loss of power to the PCM also 
resets the counter to 0. 

Warm-ups w/o Non-Emission Faults  

The scan tool displays in counts. This parameter counts the number of warm up cycles without a non-

 

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2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L - 

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emission fault present. The parameter increments until a fault occurs. If a fault occurs, the counter reverts 
to 0 until the fault is corrected. Clearing information with a scan tool or a loss of power to the PCM also 
resets the counter to 0. 

SCAN TOOL OUTPUT CONTROLS 

Scan Tool Output Controls 

Scan Tool 

Output 

Control

Additional 

Menu Selection

(s)

Description

Crankshaft 
Position 
Variation 
Learn

-

Enables the powertrain control module (PCM) to learn the variations in 
the crankshaft position (CKP) system. The PCM will learn the 
variations once the following conditions are met: 

z

Engine coolant temperature (ECT) is more than a specified 
value.  

z

All instructions on the scan tool have been completed.  

z

The accelerator pedal is smoothly applied until the fuel cut-OFF, 
as specified on the scan tool, is achieved, and then immediately 
released.  

 
The PCM learns the variation values on the deceleration from fuel cut-
OFF.

Cylinder 
Power 
Balance

Fuel System

Enables/Disables a cylinder by turning OFF the fuel injector to the 
cylinder. The fuel injector is normally enabled. The PCM disables the 
fuel injector when the following conditions are met: 

z

All instruction on the scan tool are completed  

z

Stabilized engine speed  

z

The fuel injector is selected  

 
When Disable is selected the PCM turns the injector OFF for 30 
seconds. During this period, the engine operates with a misfire.

Engine Speed 
Control

TAC System

Activates the throttle activation control (TAC) system to change engine 
RPM. The normal commanded state is None. To enable the RPM 
control, all instruction on the scan tool must be completed. The system 
will increase or decrease the RPM within a range of 350-2000 RPM. 
The set step value changes the RPM by increments of 25 RPM, 100 
RPM, and 500 RPM. The system remains in the commanded state until 
cancelled by the scan tool.

EVAP Purge 

Engine Output 

Activates the evaporative emission (EVAP) purge valve. The normal 
commanded state is None. The system will increase or decrease the 
amount of EVAP purge valve opening by 10 percent increments within 

 

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2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L - 

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Solenoid

Controls/EVAP 

System

a range of 0-100 percent. The system remains in the commanded state 
until cancelled by the tool or the fuel tank pressure (FTP) exceeds 32 
mm Hg (17 in H20).

EVAP 
Purge/Seal

Engine Output 

Controls/EVAP 

System

This control enables two functions. One function increases or decreases 
the amount of purge by changing the duty cycle of the purge valve and 
commanding the vent ON, non-venting. The normal commanded state 
of both valves is None. The system will increase or decrease the 
amount of EVAP purge valve opening by 10 percent increments within 
a range of 0-100 percent. The second function seals the system after 
using the purge function to obtain a specific amount of FTP. When 
activated the purge valve is commanded to 0 percent and the vent valve 
is commanded ON, non-venting. Both functions remain in the 
commanded state until one of the following conditions occurs: 

z

Cancelled by the tool  

z

The FTP exceeds 32 mm Hg (17 in H20)  

EVAP Vent 
Solenoid

Engine Output 

Controls/EVAP 

System

Activates the EVAP vent solenoid. The normal commanded state is 
None. When commanded ON, the vent valve switches to non-venting. 
The system remains in the commanded state until one of the following 
conditions occurs: 

z

Cancelled by the tool  

z

Purge is greater than 0 percent, and the fuel tank pressure 
exceeds 32 mm Hg (17 in H20)  

Fuel Injector 
Balance

Fuel System

Enables the fuel injector in order to verify proper fuel injector flow. 
The PCM will pulse the selected injector when the following 
conditions are met: 

z

All instruction on the scan tool completed  

z

Fuel injector selected  

z

Key ON, engine OFF  

 
The selected fuel injector can only be flowed/pulsed once per ignition 
cycle.

Fuel Pump

Engine Output 

Controls

Controls the fuel pump relay. The normal commanded state is None. 
When commanded ON/OFF, the PCM turns the fuel pump ON/OFF. If 
the engine is running, and the fuel pump is commanded OFF, the 
engine will stall. The system remains in the commanded state until 
cancelled by the scan tool.

Fuel Trim 
Enable

Fuel System

Disables the PCMs ability to learn new fuel trim parameters. The 
system remains in the commanded state until cancelled by the scan 
tool.

Fuel Trim 
Reset

Fuel System

Activates the reset of fuel trim data in all of the fuel trim cells.

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L - 

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DIAGNOSTIC TROUBLE CODE (DTC) LIST 

Diagnostic Trouble Code (DTC) List 

Loop Status

Engine Output 

Controls

Controls the system loop status. The commanded states include None, 
Open, or Closed. The normal commanded state is None. When 
commanded Open or Closed, the system remains in the commanded 
state until cancelled by the scan tool.

Malfunction 
Indicator 
Lamp

Engine Output 

Controls

Controls the malfunction indicator lamp (MIL). The commanded states 
include None, ON, and OFF. When commanded ON or OFF, the 
system remains in the commanded state until cancelled by the scan 
tool.

Misfire 
Graphic

-

Graphs the accumulated misfires occurring in each cylinder. The scan 
tool allows for a reset of the misfire graph.

O2S Heater 
Control

Engine Output 

Controls

Activates the HO2S Heater. The commanded states include None, ON, 
and OFF. The normal commanded state is None. On a cold engine, 
with the key ON, engine OFF, the HO2S signal will continue to drop 
below bias when commanded ON. The system remains in the 
commanded state until cancelled by the tool.

DTC

Diagnostic Procedure

Module(s)

P0068

DTC P0068

PCM

P0101

DTC P0101 (With Throttle Actuator Control)

PCM

P0102

DTC P0102

PCM

P0103

DTC P0103

PCM

P0106

DTC P0106 (With Throttle Actuator Control)

PCM

P0107

DTC P0107

PCM

P0108

DTC P0108

PCM

P0112

DTC P0112

PCM

P0113

DTC P0113

PCM

P0116

DTC P0116

PCM

P0117

DTC P0117

PCM

P0118

DTC P0118

PCM

P0120

DTC P0120

PCM

P0125

DTC P0125

PCM

P0128

DTC P0128

PCM

P0131

DTC P0131 or P0151

PCM

P0132

DTC P0132 or P0152

PCM

P0133

DTC P0133 or P0153

PCM

P0134

DTC P0134 or P0154

PCM

P0135

DTC P0135 or P0155

PCM

P0136

DTC P0136 or P0156

PCM

P0137

DTC P0137 or P0157

PCM

 

2004 Hummer H2 

2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L - 

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