GM Service Manual Online
For 1990-2009 cars only

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON, Engine OFF and Brake released

4WD Status

    • ABS
    • VSES

Two wheel drive/Four wheel drive

Varies

ABS Lamp Command

    • ABS
    • VSES

On/Off

Off

ABS Pump Motor

    • ABS
    • VSES

On/Off

Off

ABS Relay Command

    • ABS
    • VSES

On/Off

On

ABS Stop State

    • ABS
    • Traction Assist
    • VSES

On/Off

Off

Brake Switch Status

    • ABS
    • Traction Assist
    • VSES

On/Off

Off

Brake Warning Lamp Command

    • ABS
    • VSES

On/Off

Off

Diff. Pressure/Fluid Level Switch

    • ABS
    • VSES

Ok/Low

Ok

Digital SWPS Phase A

VSES

Low/High

Varies

Digital SWPS Phase B

VSES

Low/High

Varies

Delivered Torque

    • Traction Assist
    • VSES

%

35%

DRP Active

ABS

Yes/No

No

Lateral Accelerometer Sensor Signal

VSES

Volts

2.5 Volts

Left Front Wheel Speed

    • ABS
    • Traction Assist
    • VSES

km/h or mph

5 km/h/3 mph

LF Dump Valve Command

    • ABS
    • VSES

On/Off

Off

LF Dump Valve Feedback

ABS

On/Off

Off

LF ISO Valve Command

    • ABS
    • VSES

On/Off

Off

LF ISO Valve Feedback

ABS

On/Off

Off

LR Dump Valve Command

VSES

On/Off

Off

LR ISO. Valve Command

VSES

On/Off

Off

Left Rear Wheel Speed

VSES

km/h or mph

5 km/h/3 mph

Low Traction Lamp Command

Traction Assist

On/Off

Off

Master Cylinder Pressure Sensor Input

VSES

kPa/psi

0 kPa/psi

Pre-Charge Command

VSES

On/Off

Off

Pre-Charge Feedback

VSES

On/Off

Off

Rear Dump Valve Command

    • ABS
    • VSES

On/Off

Off

Rear Dump Valve Feedback

ABS

On/Off

Off

Rear ISO Valve Command

    • ABS
    • VSES

On/Off

Off

Rear ISO Valve Feedback

ABS

On/Off

Off

Rear Wheel Speed

    • ABS
    • Traction Assist

km/h or mph

5 km/h/3 mph

Requested Torque

    • Traction Assist
    • VSES

%

91%

RF Dump Valve Command

    • ABS
    • VSES

On/Off

Off

RF Dump Valve Feedback

ABS

On/Off

Off

RF ISO Valve Command

    • ABS
    • VSES

On/Off

Off

RF ISO Valve Feedback

ABS

On/Off

Off

Right Front Wheel Speed

    • ABS
    • Traction Assist
    • VSES

km/h or mph

5 km/h/3 mph

RR Dump Valve Command

VSES

On/Off

Off

RR ISO. Valve Command

VSES

On/Off

Off

Right Rear Wheel Speed

VSES

km/h or mph

5 km/h/3 mph

Stability System Active

VSES

Yes/No

No

Stability System Enabled

VSES

Yes/No

Varies

Steering Wheel Position

VSES

Degrees

Varies

System Voltage

VSES

Volts

12 Volts

Traction Control Active

Traction Assist

Yes/No

No

Traction Control Enabled

Traction Assist

Yes/No

Varies

Traction Control Equipped

Traction Assist

Yes/No

Yes

Traction Control Slip

Traction Assist

Yes/No

No

Traction Off Lamp Command

Traction Assist

On/Off

Off

VSES Equipped

VSES

Yes/No

Yes

VSES Relay Command

VSES

On/Off

On

Yaw Rate Sensor Input

VSES

Volts

2.5 Volts