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
    • VSES

On/Off

Off

Brake Switch Status

    • ABS
    • VSES

On/Off

Off

Brake Warning Lamp Command

    • ABS
    • VSES

On/Off

Off

Delivered Torque

VSES

%

35%

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

DRP Active

ABS

Yes/No

No

Lateral Accelerometer Sensor Signal

VSES

Volts

2.5 Volts

Left Front Wheel Speed

    • ABS
    • 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

Left Rear Wheel Speed

VSES

km/h or mph

5 km/h/3 mph

LR Dump Valve Command

VSES

On/Off

Off

LR Iso. Valve Command

VSES

On/Off

Off

Master Cylinder Pressure Sensor Input

VSES

kPa/psi

0 kPa/psi

Master Cylinder Pressure Sensor Input

VSES

Volts

0.44 Volts

Pre-Charge Command

VSES

Active/Inactive

Inactive

Pre-Charge Feedback

VSES

Active/Inactive

Inactive

Rear Dump Valve Command

ABS

On/Off

Off

Rear Dump Valve Feedback

ABS

On/Off

Off

Rear Iso. Valve Command

ABS

On/Off

Off

Rear Iso. Valve Feedback

ABS

On/Off

Off

Rear Wheel Speed

ABS

km/h or mph

5 km/h/3 mph

Requested Torque

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
    • VSES

km/h or mph

5 km/h/3 mph

Right Rear Wheel Speed

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

Stability System Active

VSES

Yes/No

No

Stability System Enabled

VSES

Yes/No

Varies

Steering Wheel Position

VSES

Degrees

Varies

Steering Wheel Sensor Signal

VSES

Volts

Varies

System Voltage

VSES

Volts

12 Volts

TCS Iso. Valve Command

VSES

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