GM Service Manual Online
For 1990-2009 cars only
Table 1: Powertrain (PCM) -- 6.6L
Table 2: Powertrain (PCM) -- 7.8L
Table 3: Powertrain (PCM) -- 8.1L

Powertrain (PCM) -- 6.6L

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Idling at Normal Operating Temperature/Vehicle is in Park or Neutral/Cruise On/Off Switch is Turned Off

Clutch Pedal Switch

Engine Data 1

Applied/Released

Released

Cruise Control Active

Engine Data 1

Yes/No

No

Cruise On/Off Switch

Engine Data 1

On/Off

Off

TCC/Cruise Brake Pedal Switch

Engine Data 1

Applied/Released

Released

Cruise Resume/Accel. Switch

Engine Data 1

On/Off

Off

Cruise Set/Coast Switch

Engine Data 1

On/Off

Off

Engine Speed

Engine Data 1

RPM

Varies

Ignition 1 Signal

Engine Data 1

Volts

12 to 16 Volts

Stoplamp Pedal Switch

Engine Data 1

Applied/Released

Released

Vehicle Speed Sensor

Engine Data 1

km/h (mph)

0 km/h (0 mph)

Powertrain (PCM) -- 7.8L

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Idling at Normal Operating Temperature/Vehicle is in Park or Neutral/Cruise On/Off Switch is Turned Off

Clutch Pedal Switch

Engine Data 1

Applied/Released

Released

Cruise Control Active

Engine Data 1

Yes/No

No

Cruise On/Off Switch

Engine Data 1

On/Off

Off

Cruise Resume/Accel. Switch

Engine Data 1

On/Off

Off

Cruise Set/Coast Switch

Engine Data 1

On/Off

Off

Engine Speed

Engine Data 1

RPM

Varies

Ignition 1 Signal

Engine Data 1

Volts

12 to 16 Volts

Stoplamp Pedal Switch

Engine Data 1

Applied/Released

Released

Vehicle Speed Sensor

Engine Data 1

km/h (mph)

0 km/h (0 mph)

Powertrain (PCM) -- 8.1L

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Idling at Normal Operating Temperature/Vehicle is in Park or Neutral/Cruise On/Off Switch is Turned Off

Cruise Control Active

Cruise Control Data

Yes/No

No

Cruise Disengage (1 - 8) History

Cruise Control Data

Last reason for cruise control disengagement

Varies

Cruise On/Off Switch

Cruise Control Data

On/Off

Off

Cruise Release Brake Pedal Switch

Cruise Control Data

Applied/Released

Released

Cruise Resume/Accel. Switch

Cruise Control Data

On/Off

Off

Cruise Set/Coast Switch

Cruise Control Data

On/Off

Off

Engine Speed

Cruise Control Data

RPM

Varies

Ignition 1 Signal

Cruise Control Data

Volts

12 to 16 Volts

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

Vehicle Speed Sensor

Cruise Control Data

km/h (mph)

0 km/h (0 mph)