Hummer H2. Manual — part 1614

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-

2004 Hummer H2

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

Hummer H2

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 -

Hummer H2

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.

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

Hummer H2

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 -

Hummer H2