GM Service Manual Online
For 1990-2009 cars only

The ABS scan tool data definitions contain a brief description of all ABS related parameters available on the scan tool. The parameters available on the scan tool are listed below in alphanumeric order.

4WD Status: The scan tool displays if the vehicle is in 2 wheel drive or 4 wheel drive.

ABS Active: The scan tool displays if the ABS system is performing antilock braking.

ABS Lamp Command:  The scan tool displays the commanded state of the ABS warning indicator.

ABS Pump Motor: The scan tool displays On/Off. The scan tool displays On when the ABS pump motor is commanded on.

ABS Relay Command: The scan tool displays the commanded state of the ABS system relay.

ABS Stop State: The scan tool displays if the ABS system is performing antilock braking.

Accum. Pressure Sensor: The scan tool displays brake fluid pressure stored in the accumulator.

Analog Steering Position Sensor: The scan tool displays the analog steering position angle in degrees.

Battery Voltage: The scan tool displays the approximate voltage supplied by the battery and charging system.

Brake Fluid Level: The scan tool displays if the brake fluid is Low or OK.

Brake Switch Status:  The scan tool displays the state of the brake switch.

Brake Warning Lamp Command: The scan tool displays ON when the EBCM requests illumination of the brake warning indicator.

Delivered Torque:  The scan tool displays between 11% and 90%. The PCM provides the percentage of engine torque that is currently applied to the wheels. The lower the percentage the less torque applied to the wheels.

Digital Steering Position Sensor: The scan tool displays the digital steering position angle in degrees.

Lateral Accelerometer Input: The scan tool displays the sidways acceleration of the vehicle in meters per second (m/s) or feet per second (ft/s).

Left Front Wheel Speed: The scan tool displays the actual speed of the left front wheel.

Left Rear Wheel Speed: The scan tool displays the actual speed of the left rear wheel.

LF Dump Valve Command: The scan tool displays the commanded state of the left front dump valve solenoid.

LF Iso. Valve Command: The scan tool displays the commanded state of the left front isolation valve solenoid.

LR Dump Valve Command: The scan tool displays the commanded state of the left rear dump valve solenoid.

LR Iso. Valve Command: The scan tool displays the commanded state of the left front isolation valve solenoid.

Longitudinal Accelerometer Sensor Signal: The scan tool displays the longitudinal accelerometer sensor signal voltage.

Master Cylinder Pressure Sensor Input: The scan tool displays the hydraulic brake pressure applied by the master cylinder.

Requested Torque:  The scan tool displays between 11% and 90%. The PCM provides the percentage of engine torque that is currently applied to the wheels. The lower the percentage the less torque applied to the wheels.

Reverse Switch: The scan tool displays ON when the transmission gear selector is in reverse.

Right Front Wheel Speed: The scan tool displays the actual speed of the left front wheel.

Right Rear Wheel Speed: The scan tool displays the actual speed of the left rear wheel.

RF Dump Valve Command: The scan tool displays the commanded state of the left front dump valve solenoid.

RF Dump Valve Command: The scan tool displays On/Off. The scan tool displays On when the right front dump valve solenoid is commanded on.

RF Iso. Valve Command: The scan tool displays the commanded state of the left front isolation valve solenoid.

RR Dump Valve Command: The scan tool displays the commanded state of the left rear dump valve solenoid.

RR Iso. Valve Command: The scan tool displays the commanded state of the left front isolation valve solenoid.

Stability System Active: The scan tool displays the active status of the vehicle stability enhancement system (VSES).

Stability System Enabled: The scan tool displays the operating status of the VSES.

System Configuration: The scan tool displays the configuration of the EBCM.

System Voltage: The scan tool displays the approximate voltage supplied by the battery and charging system.

TCS Status/EBCM --TCS Active: The scan tool displays Yes if the EBCM is requesting torque reduction from the PCM.

TCS Status/PCM --TCS Active: The scan tool displays Yes if the PCM is reducing engine torque during a traction control event.

Traction Control Equipped: The scan to displays if the vehicle is equipped with traction control.

Traction Control Switch: The scan tool displays the status of the traction control switch that is reported by the BCM.

Transmission Type: The scan too displays wether the vehicle is equipped with a manual or automatic transmission.

VSES Control Switch: The scan tool displays if the enabled / disabled status of the VSES system requested by the BCM / traction switch. VSES can be disabled by use of the traction switch.

VSES Equipped: The scan tool displays if the vehicle is equipped with VSES.

Yaw Rate Sensor Input: The scan tool displays the degrees of vehicle rotation (yaw rate) per second.