Hummer H2. Manual — part 1508
and in the correct location.
5. Inspect for aftermarket devices that
could affect the operation of the
system. Refer to Checking
Aftermarket Accessories in
Wiring Systems.
Did you find and correct the condition?
System OK
Go to Step 2
2
1. Install a scan tool.
2. Turn ON the scan tool.
Does the scan tool turn ON?
Go to Step 3
Go to Scan Tool Does
Not Power Up in Data
Link Communications
3
1. Turn ON the ignition, with the
engine OFF.
2. Attempt to establish
communication with the listed
control modules. If you are using a
Tech 2, obtain the information
using the Class 2 Message Monitor
feature:
z
Powertrain control module
(PCM)
z
Electronic brake control
module (EBCM)
z
Body control module (BCM)
Does the scan tool communicate with all
the listed modules?
Go to Step 4
Go to Scan Tool Does
Not Communicate with
Class 2 Device in Data
Link Communications
4
1. Access the Class 2 Power Mode in
the Diagnostic Circuit Check on
the scan tool.
2. Rotate the ignition switch through
all positions while observing the
ignition switch power mode
parameter.
Refer to the Body Control System
IMPORTANT:
The engine may start during the
following step. Turn OFF the engine as
soon as you have observed the Crank
power mode.
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L -
Hummer H2
Description and Operation in
Body Control Systems, for a list of
the power mode states that
correspond to each ignition switch
position.
Does the ignition switch parameter
reading match the ignition switch
position for all switch positions?
Go to Step 5
Go to Power Mode
Mismatch in Body
Control System
5
Attempt to start the engine.
Does the engine crank?
Go to Step 6
Go to Symptoms -
Engine Electrical in
Engine Electrical
6
Did the engine start and idle?
Go to Step 7
Go to Engine Cranks
but Does Not Run
7
1. Select the DTC display function for
the following control modules and
record the DTCs:
z
PCM
z
EBCM
z
BCM
2. If multiple powertrain DTCs are
stored, diagnose the DTCs in the
following order:
1. Component level DTCs.
For example, sensor DTCs,
solenoid DTCs, and relay
DTCs.
Begin with the lowest
number DTC unless the
diagnostic table directs you
otherwise.
2. System level DTCs.
For example, misfire DTCs,
EVAP system DTCs, fuel
trim DTCs, and system
voltage DTCs.
IMPORTANT:
Do NOT clear the DTCs unless
instructed by a diagnostic procedure.
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L -
Hummer H2
SCAN TOOL DATA LIST
The Engine Scan Tool Data List contains all engine related parameters that are available on the scan tool. The
list is arranged in alphabetical order. A given parameter may appear in any one of the data lists, and in some
cases may appear more than once, or in more than one data list in order to group certain related parameters
together.
Use the Engine Scan Tool Data List only after the following is determined:
z
The Diagnostic System Check - Engine Controls is completed.
z
No diagnostic trouble codes (DTCs)
z
On-board diagnostics are functioning properly.
Scan tool values from a properly running engine may be used for comparison with the engine you are
diagnosing. The Engine Scan Tool Data List represents values that would be seen on a normal running engine.
Only the parameters listed below are referenced in this service manual for use in diagnosis. If all values are
within the typical range described below, refer to Symptoms - Engine Controls for diagnosis.
The column labeled Data List indicates where a parameter can be located on the scan tool. Refer to the scan tool
operating manual for the exact locations of the data lists. The following is a description of each term listed:
All
The Parameter is in all of the data lists indicated below.
3. Search for applicable service
bulletins.
Does the scan tool display any DTCs?
Go to Step 8
Go to Step 9
8
If there are any powertrain DTCs, select
Capture Info to store the powertrain DTC
information with a scan tool.
Did you complete the action?
Go to Diagnostic Trouble
Code (DTC) List for
applicable diagnostic
procedure
-
9
Is the customer's concern with
Inspection/Maintenance (I/M) testing?
Go to
Inspection/Maintenance
(I/M) System Check
Go to Step 10
10
Are there any driveability symptoms
observed?
Go to Symptoms - Engine
Controls
System OK
IMPORTANT: A scan tool that displays faulty data should not be used. The scan tool problem
should be reported to the manufacturer. Use of a faulty scan tool can result in
misdiagnosis and unnecessary parts replacement.
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L -
Hummer H2
Eng 1
Engine Data 1 List
Eng 2
Engine Data 2 List
EE
Enhanced Evaporative Emission (EVAP) Data
FF/FR
Freeze Frame/Failure Records
FT
Fuel Trim Data List
MF
Misfire Data List
TAC
Throttle Actuator Control (TAC) Data List
CC
Cruise Control Data List
HO2S Data
Heated Oxygen Sensor (HO2S) Data List
Scan Tool Data List
Scan Tool Parameter
Data List
Parameter Range/Units
Typical Data Values
Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories OFF
4WD Signal
Eng 2
Enabled/Disabled
Disabled
4WD Low Signal
Eng 2
Enabled/Disabled
Disabled
A/C Pressure Sensor
Eng 2
Volts
0.98 Volts/Varies
A/C Pressure Sensor
Eng 2
PSI
90 PSI/Varies
A/C Relay Command
Eng 1, 2, MF
On/Off
Off
A/C Request Signal
Eng 2
Yes/No
No
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L -
Hummer H2
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