Hummer H2. Manual - part 1511

 

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Hummer H2. Manual - part 1511

 

 

Decel. Fuel Cutoff  

This parameter displays the status of the operating mode used to turn OFF the fuel injectors during certain 
deceleration conditions. When the scan tool displays Active, the control module has turned OFF the fuel 
injectors. When the scan tool displays Inactive, the fuel system is operating normally. 

Desired IAC Airflow  

This parameter displays the desired airflow in the idle air control (IAC) passage as calculated by the 
control module. 

Desired Idle Speed  

This parameter displays the engine idle speed in RPM commanded by the control module. The control 
module compensates for various engine loads in order to maintain the desired engine RPM at idle. This 
parameter is not valid unless the engine is running. 

DTC Set This Ignition  

This parameter displays if a diagnostic trouble code (DTC) set during the current ignition cycle. The scan 
tool will display YES if a DTC is stored this ignition cycle. 

ECT Sensor  

This parameter displays the temperature of the engine coolant based on a voltage input from the engine 
coolant temperature (ECT) sensor to the control module. The scan tool will display a low value when 
coolant temperature is low, and a high value when the coolant temperature is high. 

Engine Load  

This parameter displays the engine load in percent based on inputs to the control module from various 
engine sensors. The scan tool will display a low percentage when the engine is at idle with little or no 
load. The scan tool will display a high percentage when the engine is running at a high RPM under a 
heavy load. 

Engine Oil Level Switch  

This parameter displays the state of the engine oil level switch as determined by the control module. The 
scan tool will display OK or Low. OK indicates that the engine oil level is not too low for safe operation 
of the engine. Low indicates the engine oil level is abnormally low and has closed the engine oil level 
switch. 

Engine Oil Life Remaining  

This parameter displays the amount of engine oil life remaining before requiring an oil change. This 
number is calculated by the control module based on many inputs and is displayed as a percent. The 
lower the percentage, the sooner the next oil change will be required.

 

2004 Hummer H2 

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

Hummer H2

  

Engine Run Time  

This parameter displays the time elapsed since the engine was started. The scan tool will display the time 
in hours, minutes and seconds. The engine run time will reset to zero as soon as the engine stops running. 

Engine Speed  

This parameter displays the speed of the crankshaft as calculated by the control module based on inputs 
from the crankshaft position (CKP) sensor. The scan tool will display the engine speed in revolutions per 
minute (RPM). 

EVAP Purge Solenoid Command  

This parameter displays the on-time or duty cycle of the evaporative emission (EVAP) purge solenoid 
commanded by the control module expressed as a percent. The scan tool will display a high percentage 
when the control module is commanding the EVAP purge solenoid to be open a large amount. The scan 
tool will display a low percentage when the control module is commanding the EVAP purge solenoid to 
be open a small amount. The scan tool will display 0 when the control module is commanding the EVAP 
purge solenoid closed. 

EVAP Test Result  

The scan tool displays No Result, Passed, Aborted, Fail-DTC P0440, Fail-DTC P0442, Fail-DTC P0446, 
or Fail-DTC P1441. The scan tool displays PASS if the control module determines that the EVAP test has 
passed. 

EVAP Test State  

The scan tool displays Waiting For Purge, Test Running, or Test Completed. This parameter indicates the 
state of the EVAP service bay test. 

EVAP Vent Solenoid Command  

This parameter displays the commanded state of the EVAP vent solenoid control circuit. The scan tool 
will display Venting or Not Venting. Venting indicates the EVAP vent solenoid is not being commanded 
on by the control module. Not Venting indicates the EVAP vent solenoid is being commanded ON by the 
control module. 

Fail Counter  

The scan tool displays the number of times that a diagnostic has failed. 

Fuel Alcohol Content  

This parameter displays the percentage of alcohol in the fuel. This value is calculated by the control 
module using the frequency signal from the fuel composition sensor. The scan tool will display a low 
percentage when there is very little alcohol in the fuel. The scan tool will display a high percentage when 

 

2004 Hummer H2 

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

Hummer H2

  

the alcohol content of the fuel is high.

Fuel Composition Sensor Frequency  

This parameter displays the frequency from the sensor used to monitor the concentration of alcohol in the 
fuel. The fuel composition sensor measures the fuel capacitance, temperature, and fuel conductance to 
determine the amount of alcohol contained in the fuel. The scan tool will display a low frequency reading 
when the alcohol concentration of the fuel is low. The scan tool will display a high frequency reading 
when the alcohol concentration of the fuel is high. 

Fuel Composition Sensor On Time  

This parameter displays the pulse width signal of the fuel composition sensor as received by the control 
module. The scan tool will display a lower value at colder fuel temperatures. The scan tool will display a 
higher value at higher fuel temperatures. 

Fuel Level Sensor  

This parameter displays the voltage from the signal produced by the sensor used to monitor the fuel level 
inside the fuel tank. The scan tool will display a low voltage reading when the fuel level in the tank is low 
or near empty. The scan tool will display a high voltage reading when the fuel level in the tank is high or 
near full. 

Fuel Level Sensor Rear Tank  

This parameter displays the voltage from the signal produced by the sensor used to monitor the fuel level 
inside the rear fuel tank. The scan tool will display a low voltage reading when the fuel level in the rear 
tank is low or near empty. The scan tool will display a high voltage reading when the fuel level in the 
tank is high or near full. 

Fuel Tank Level Remaining  

This parameter displays the amount of fuel remaining in all fuel tanks of the vehicle as measured in liters 
or gallons. The control module calculates the amount of fuel remaining in the tank by using information 
from the fuel level sensors. 

Fuel Tank Level Remaining  

This parameter displays the amount of fuel remaining in tall of the fuel tanks of the vehicle as a 
percentage. The control module calculates this level using the signals from the sensors used to monitor 
the fuel level in the fuel tanks. The scan tool will display a low reading when the total fuel level in the 
vehicle is low or near empty. The scan tool will display a high reading when the fuel level in the tank is 
high or near full. 

Fuel Tank Pressure Sensor  

This parameter indicates the pressure or vacuum in the fuel tanks as determined by the control module 

 

2004 Hummer H2 

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

Hummer H2

  

based on inputs from the fuel tank pressure sensor. The scan tool displays in mm/Hg or in H2O. The scan 
tool indicates a negative value if there is a vacuum in the fuel tank, and a positive value if there is 
pressure in the fuel tank. 

Fuel Tank Pressure Sensor  

This parameter displays the voltage signal sent to the control module from the sensor used to monitor the 
pressure inside the fuel tank. The scan tool will display a low voltage when the pressure in the fuel tank is 
high. The scan tool will display a high voltage when the pressure in the fuel tank is low or in a vacuum. 

Fuel Tank Rated Capacity  

The scan tool displays liters or gallons. This parameter displays the fuel tank capacity as determined by 
the calibrations of the vehicle. 

Fuel Temperature  

This parameter displays the current fuel temperature as calculated by the control module based on input 
from the fuel composition sensor. The scan tool will display a higher value at higher fuel temperatures. 
The scan tool will display a lower value at lower fuel temperatures. 

Fuel Trim Cell  

This parameter displays the fuel trim cell as calculated by the control module based on many sensor 
inputs. The fuel trim cell indicates which cell is currently active. 

Fuel Trim Learn  

The scan tool displays Enabled or Disabled. When conditions are appropriate for enabling long term fuel 
trim corrections, the scan tool displays Enabled. If the scan tool displays Disabled, then long term fuel 
trim will not respond to changes in short term fuel trim. 

Generator F-Terminal Signal  

This parameter displays the commanded state of the generator by the control module. A high value 
indicates a high charging command, and a low value indicates a low charging command. 

Generator L-Terminal Signal Command  

This parameter displays if the control module is allowing the generator to operate. The scan tool displays 
ON if the generator is allowed to operate. The scan tool displays OFF if the control module is disabling 
the generator. 

HO2S Bank 1 Sensor 1  

This parameter displays the voltage from the signal produced by the heated oxygen sensor used to 
monitor fuel trim for cylinder bank 1. The scan tool will display a low voltage reading when that cylinder 

 

2004 Hummer H2 

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

Hummer H2

  

 

 

 

 

 

 

 

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