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