GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition On/Engine Idling at normal operating temperature/Transmission in Park or Neutral/Cruise Control On/Off switch 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 Release Clutch/TCC Pedal Switches

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

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 (0mph)