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

ABS

Hydraulic 4WAL 4 Sensor

Enabled/Disabled

Varies

Brake Fluid Level

Hydraulic 4WAL 4 Sensor

Ok/Low

Ok

Brake Switch Status

Hydraulic 4WAL 4 Sensor

On/Off

Off

Ignition Voltage

Hydraulic 4WAL 4 Sensor

Volts

12.0 Volts

Left Front Wheel Speed

Hydraulic 4WAL 4 Sensor

km/h or mph

0 km/h/0 mph

Left Rear Wheel Speed

Hydraulic 4WAL 4 Sensor

km/h or mph

0 km/h/0 mph

LF Dump Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

LF ISO Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

Low Traction Lamp Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

LR Dump Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

LR ISO Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

RF Dump Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

RF ISO Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

Right Front Wheel Speed

Hydraulic 4WAL 4 Sensor

km/h or mph

0 km/h/0 mph

Right Rear Wheel Speed

Hydraulic 4WAL 4 Sensor

km/h or mph

0 km/h/0 mph

RR Dump Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

RR ISO Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off

Service Brake Soon Lamp

Hydraulic 4WAL 4 Sensor

On/Off

Varies

Traction Control Active

Hydraulic 4WAL 4 Sensor

Yes/No

No

Traction Control System

Hydraulic 4WAL 4 Sensor

Enabled/Disabled

Varies

Traction Off Lamp Command

Hydraulic 4WAL 4 Sensor

On/Off

Varies

Traction Control Isolation Valve Command

Hydraulic 4WAL 4 Sensor

On/Off

Off