Hummer H2. Manual - part 227

SCAN TOOL DATA DEFINITIONS (CRUISE CONTROL) 

The Scan Tool Data Definitions contains a brief description of all cruise control related parameters available on 
the scan tool. 

Cruise Control Active  

The scan tool displays Yes or No. The PCM determines the current status of cruise control operation. An 
active cruise control system is displayed as Yes. 

Cruise Disengage (1 - 8) History  

The scan tool displays the last 8 reasons why the cruise control system was disengaged. Refer to the Scan 
Tool Data Definitions (Disengaged History) for descriptions. 

Cruise On/Off Switch  

The scan tool displays On or Off. The TAC module monitors the signal circuit of the On/Off switch of 
the cruise control system. A closed switch is displayed as On. 

Cruise Release Brake Pedal Switch  

The scan tool displays Applied or Released. The PCM monitors the TCC brake switch/Cruise control 
release signal circuit. An open switch is displayed as Applied. 

Cruise Resume/Accel. Switch  

The scan tool displays On or Off. The TAC Module monitors the signal circuit of the Resume/Accel. 
switch of the cruise control system. A closed switch is displayed as On. 

Cruise Set/Coast Switch  

Data

Ignition 1 Signal

Cruise Control 

Data

Volts

Varies

Reduced Engine Power

Cruise Control 

Data

Active/Inactive

Inactive

Stoplamp Pedal Switch

Cruise Control 

Data

Applied/Released

Released

TAC/PCM Communication 

Signal

Cruise Control 

Data

OK/Fault

OK

Traction Control Signal

Cruise Control 

Data

Active/Inactive

Inactive

Vehicle Speed Sensor

Cruise Control 

Data

km/h (mph)

0 km/h (0 mph)

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

  

The scan tool displays On or Off. The TAC module monitors the signal circuit of the Set/Coast switch of 
the cruise control system. A closed switch is displayed as On. The cruise On/Off switch must be switched 
On in order to correctly view the Cruise Set/Coast Switch parameter. 

Engine Speed  

The scan tool displays 0 to 9,999 RPM. The PCM monitors the CKP signal circuit in order to determine 
the engine RPM. 

Ignition 1 Signal  

The scan tool displays 6 Volts to 18 Volts. The PCM monitors the Ignition 1 signal circuit in order to 
determine the system voltage. 

Reduced Engine Power  

The scan tool displays Active or Inactive. When the PCM determines that a throttle actuator control 
system malfunction exists, the scan tool displays Active. 

TAC/PCM Communication Signal  

The scan tool displays OK or Fault. The PCM uses the UART serial data circuit in order to communicate 
with the TAC module. If the communication between the PCM and the TAC module is interrupted, the 
scan tool displays Fault. 

Traction Control Signal  

The scan tool displays Active or Inactive. When the PCM receives a class 2 signal from the Electronic 
Brake Control Module requesting a traction control related function, the scan tool displays Active. 

Stoplamp Pedal Switch  

The scan tool displays Applied or Released. The PCM monitors the stop lamp switch signal circuit. A 
closed switch is displayed as Applied. 

Vehicle Speed Sensor  

The scan tool displays 0 to 150 km/h (93.2 mph). The PCM monitors the vehicle speed sensor signal 
circuit in order to calculate the vehicle speed for display. 

SCAN TOOL DATA DEFINITIONS (DISENGAGE HISTORY) 

The Cruise Control Scan Tool Definitions - Disengage History is a common list for all of the available cruise 
control disengagement definitions available on the scan tool. The cruise control system equipped on the vehicle 
determines which cruise control disengagement parameters are available on the scan tool. 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

  

One of the following conditions must be present in order for a disengagement parameter to appear:

z

The cruise control system is active and disengagement is requested.  

z

The engagement of the cruise control system is requested while a fault is present.  

Accel Rate  

The PCM/ECM detects that the vehicle acceleration is greater than the calibrated cruise control threshold.

Bad Sequence  

The PCM/ECM detects that a cruise control software execution error is present. 

Brake  

The PCM/ECM detects that the stop lamps have been activated or the PCM/ECM detects that a stop lamp 
pedal activation had not occurred before the cruise control system was requested. 

Cancel  

The PCM/ECM detects that the cruise control cancel switch has been activated. 

CC Sw. Position  

The PCM/ECM detects that the acceleration mode is active without the activation of the Accel. switch. 

Clutch  

The PCM/ECM detects that the clutch pedal switch has been activated. 

Clutch Switch  

The PCM/ECM detects that the clutch pedal switch has been activated. 

Cruise Off  

The PCM/ECM detects that the cruise On/Off switch was turned to Off when the cruise control system 
was enabled. 

Coast Low Speed  

The PCM/ECM detects that the Set/Coast switch is activated until the vehicle speed is below 37 km/h (23 
mph). 

Coast Disengage  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

  

When the PCM/ECM detects that the cruise set/coast signal is active and the throttle blade fully closes the 
cruise control system will disengage until the PCM/ECM detects that the set/coast signal is inactive. The 
cruise control system will then engage and set with the new vehicle speed. 

Decel Rate  

The PCM/ECM detects that the vehicle deceleration is greater than the calibrated cruise control threshold.

DTC Set  

The PCM/ECM detects that a DTC has been set which affects the cruise control operation. 

Engine Run Time  

The PCM/ECM detects that the cruise control system has been requested and the engine run time counter 
is not active. 

Engine Speed  

The PCM/ECM detects that the engine speed is less than or greater than a calibrated RPM. 

ETC  

The PCM/ECM detects a fault within the TAC system. 

First Gear  

While the cruise control system is active, the PCM/ECM detects that the transmission is in Drive 1. 

High Accel.  

The PCM/ECM detects that the vehicle acceleration is greater than the calibrated cruise control threshold.

High Decel.  

The PCM/ECM detects that the vehicle deceleration is greater than the calibrated cruise control threshold.

High Speed  

The PCM/ECM detects that the vehicle speed is greater than the calibrated amount. 

Illegal Mode  

The PCM/ECM detects that the acceleration mode is active without the activation of the Accel. switch. 

Injector Disable  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2