GM Service Manual Online
For 1990-2009 cars only

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine is at idle, upper radiator hose is hot, closed throttle, gear is in Park or Neutral, and accessories are OFF.

2WD High Indicator Light

Transfer Case Data

On/Off

On

4WD High Indicator Light

Transfer Case Data

On/Off

Off

4WD Low Indicator Light

Transfer Case Data

On/Off

Off

Accessory Status

Transfer Case Data

Not Active/Active

Active

ATC Motor Init. Test

Transfer Case Data

Not Initialized/Passed/Failed/In Progress

Passed

Auto 4WD Indicator Light

Transfer Case Data

On/Off

On

Battery Voltage

Transfer Case Data

Volts

Battery Voltage

Clutch Calibration Status

Transfer Case Data

Not Learned/Initial Learn/Normal Learn

Normal Learn

Clutch Coupling

Transfer Case Data

0-100%

Varies

Front Axle Actuator

Transfer Case Data

Volts

Battery Voltage

Front Axle Actuator Status

Transfer Case Data

Engaged/Disengaged

Disengaged

Front Axle Switch

Transfer Case Data

Locked/Unlocked

Unlocked

Incremental Impulse Sensor

Transfer Case Data

PWM Voltage

Varies

Incremental Position Sensor Direction

Transfer Case Data

Clockwise/Counter Clockwise

Varies

Incremental Position Sensor

Transfer Case Data

Degrees

Varies

Incremental Position Sensor

Transfer Case Data

Volts

Varies

Mode Switch Return Voltage

Transfer Case Data

Volts

Varies

Mode Switch Selected

Transfer Case Data

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

2 High

Mode Switch Supply Voltage

Transfer Case Data

Volts

5 Volts

Motor Brake

Transfer Case Data

Volts

Battery Voltage

Neutral Indicator Light

Transfer Case Data

On/Off

Off

Rotational Position Sensor

Transfer Case Data

Degrees

Varies

Rotational Position Sensor

Transfer Case Data

Volts

Varies

Run/Crank

Transfer Case Data

Active/Inactive

Active

Software Part Number

Transfer Case Data

GM Part Number

Current Software Release

Transfer Case Lock

Transfer Case Data

Engaged/Disengaged

Disengaged

Transfer Case Motor

Transfer Case Data

Amperage

0 Amps

Transfer Case Position

Transfer Case Data

Current Transfer Case Mode or Range

2 High

Trans. Fluid Temp

Transfer Case Data

Degrees C

Varies

TR Switch Status

Transfer Case Data

Current Transmission Gear

Park

Vehicle Speed

Transfer Case Data

km/h

Varies