GM Service Manual Online
For 1990-2009 cars only
Table 1: Electronic Brake Control Module Scan Tool Data Parameters
Table 2: Electronic Brake Control Module Scan Tool Output Controls

Electronic Brake Control Module Scan Tool Data Parameters

Parameter

System State

Expected Value

Definition

Operating Conditions: Ignition ON, Engine OFF, Brake Released

ABS Lamp Command

--

Off

The scan tool displays On or Off. The currently commanded state of the ABS warning indicator.

ABS Pump Motor

--

Off

The scan tool displays On or Off. The scan tool displays On when the ABS pump motor is commanded on.

ABS Relay Command

--

On

The scan tool displays On or Off. The scan tool displays the commanded state of the ABS system relay.

Battery Voltage

--

Varies

This displays volts. The scan tool displays the approximate voltage supplied by the battery and charging system.

Brake Switch Status

--

Off

The scan tool displays On or Off. The current state of the brake switch.

Delivered Torque

--

Varies

The scan tool displays 11-91%. The scan tool displays 11% when the PCM provides the minimum percentage of available torque in an attempt to eliminate wheel slip.

Left Front Wheel Speed

--

0 km/h (0 mph)

This displays km/h (mph). This is the current speed of the left front wheel speed sensor.

LF Dump Valve Command

--

Off

The scan tool displays On or Off. On is displayed when the left front dump valve solenoid is commanded on.

LF Iso. Valve Command

--

Off

The scan tool displays On or Off. On is displayed when the left front isolation valve solenoid is commanded on.

Low Trac: TCS Active

--

No

The scan tool displays Yes/No. The scan tool displays Yes when the low trac message is displayed.

Rear Wheel Speed

--

km/h

The scan tool displays 0-257 km/h (0-160 mph). The scan tool displays 0 km/h (0 mph) when the vehicle is not moving.

Rear Dump Valve Command

--

Off

The scan tool displays On or Off. On is displayed when the rear dump valve solenoid is commanded on.

Rear Iso. Valve Command

--

Off

The scan tool displays On or Off. On is displayed when the rear isolation valve solenoid is commanded on.

Requested Torque

--

Varies

The scan tool displays 11-91%. The scan tool displays 11% when the EBCM requests the minimum percentage of available torque in an attempt to eliminate wheel slip.

RF Dump Valve Command

--

Off

The scan tool displays On or Off. On is displayed when the right front dump valve solenoid is commanded on.

RF Iso. Valve Command

--

Off

The scan tool displays On or Off. On is displayed when the right front isolation valve solenoid is commanded on.

Right Front Wheel Speed

--

0 km/h (0 mph)

This displays km/h (mph). This is the current speed of the right front wheel speed sensor.

TCS Failed

--

No

The scan tool displays Yes/No. The scan tool displays Yes when the traction fault message is displayed.

TCS On/Off Switch

--

Off

The scan tool displays On or OFF. On is displayed when TCS is commanded.

Traction Control

--

Not Requested

The scan tool displays Requested or Not Requested. Request is displayed when traction control is commanded on.

Electronic Brake Control Module Scan Tool Output Controls

Scan Tool Output Control

Description

ABS Motor

This is used in order to command the ABS pump motor On or Off.

LF Inlet Valve Solenoid

Commands the indicated solenoid ON and OFF.

LF Outlet Valve Solenoid

Commands the indicated solenoid ON and OFF.

Rear Inlet Valve Solenoid

Commands the indicated solenoid ON and OFF.

Rear Outlet Valve Solenoid

Commands the indicated solenoid ON and OFF.

RF Inlet Valve Solenoid

Commands the indicated solenoid ON and OFF.

RF Outlet Valve Solenoid

Commands the indicated solenoid ON and OFF.