GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Idling at normal operating temperature/Transmission in Park or Neutral/Cruise Control On/Off Switch Off

Battery Voltage

Engine Data 1

Engine Data 2

Engine Data 3

TAC Data

Volts

Varies

Clutch Pedal Switch

Engine Data 1

Engine Data 3

TAC Data

Applied/Released

Released

Cruise Engaged

Engine Data 1

Engine Data 2

Engine Data 3

TAC Data

No/Yes

No

Cruise On/Off Switch

TAC Data

On/Off

Off

Cruise Release Brake Pedal Switch

Engine Data 1

Engine Data 3

TAC Data

Applied/Released

Released

Cruise Resume/Accel. Switch

TAC Data

On/Off

Off

Cruise Set/Coast Switch

TAC Data

On/Off

Off

Cruise -- VSS Out of Range

Engine Data 2

Engine Data 3

TAC Data

No/Yes

Yes

Engine Speed

Engine Data 1

Engine Data 2

Engine Data 3

EVAP Data

Fuel Trim Data

TAC Data

RPM

Varies

Extended Travel Brake Pedal Switch

Engine Data 1

Engine Data 2

Engine Data 3

TAC Data

Applied/Released

Released

Vehicle Speed

Engine Data 1

Engine Data 2

Engine Data 3

EVAP Data

Fuel Trim Data

TAC Data

km/h (mph)

0 km/h (0 mph)