GM Service Manual Online
For 1990-2009 cars only

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/engine OFF or engine ON

Battery Voltage

EFCM Data

Volts

8-16

Engine Run

EFCM Data

Yes/No

Varies

Exhaust Valve Command

EFCM Data

On/Off

Varies

Power Mode

EFCM Data

Off/RAP/Acc/On/Crank

Varies

System Enabled

EFCM Data

Yes/No

Varies

System Mode Status

EFCM Data

Normal/Comp

Varies

Throttle Position

EFCM Data

%

Varies

Vehicle Speed

EFCM Data

kph/mph

Varies