GM Service Manual Online
For 1990-2009 cars only

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

DEFINITION: Engine is at idle, upper radiator hose is hot, closed throttle, gear is in park or neutral, and accessories are OFF.

ATC Application

Transfer Case Data

Application

Varies

ATC Slip Speed

Transfer Case Data

RPM

0

Auto 4WD Indicator

Transfer Case Data

On/Off

On

Battery Voltage

Transfer Case Data

Volts

Battery Voltage

Current Slip Adapts

Transfer Case Data

Counts

Varies

Encoder Gear Position

Transfer Case Data

2WD/4WD High/4WD Low/Auto 4WD

Varies

Encoder Return Voltage

Transfer Case Data

Volts

0-5 V

Encoder Supply Voltage

Transfer Case Data

Volts

0-5 V

Front Axle Requested

Transfer Case Data

Yes/No

Yes

Front Axle Switch

Transfer Case Data

Locked/Unlocked

Locked

Front Propshaft Speed

Transfer Case Data

RPM

0

Ign. Cycles Since Last Current DTC

Transfer Case Data

Number

Varies

Mode Switch Return Voltage

Transfer Case Data

Volts

0-5 V

Mode Switch Selected

Transfer Case Data

2WD/4WD High/4WD Low/Auto 4WD

Varies

Neutral Indicator Light

Transfer Case Data

On/Off

Off

Rear Propshaft Speed

Transfer Case Data

RPM

0

Service 4WD Lamp

Transfer Case Data

On/Off

Off

Slip Adapt PWM

Transfer Case Data

%DC

0

Total Slippage

Transfer Case Data

RPM

0

Transfer Case Lock

Transfer Case Data

Enabled/Disabled

Disabled

2WD High Indicator

Transfer Case Data

On/Off

Off

4WD High Indicator

Transfer Case Data

On/Off

Off

4WD Low Active

Transfer Case Data

Yes/No

No

4WD Low Indicator

Transfer Case Data

On/Off

Off