GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (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)