GM Service Manual Online
For 1990-2009 cars only

The electronic suspension control (ESC) scan tool data list contains all the electronic suspension control system related parameters that are available on the scan tool. The parameters in the list are arranged in alphabetical order. The column, Data List, indicates the location of the parameter within the scan tool menu selections.

Use the ESC scan tool data list as directed by a diagnostic table or in order to supplement the diagnostic procedures. Begin all of the diagnostic procedures with the Diagnostic System Check. Use the ESC scan tool data list only after the following is determined:

    • The ESC Diagnostic System Check is complete.
    • The on board diagnostics are operating correctly.
    • No diagnostic trouble codes (DTCs) are displayed.

The typical scan tool data values are an average of the displayed values recorded from normally operating vehicles. The typical scan tool data values are intended to represent what a normally functioning system would display with certain preliminary settings. The values you get may vary slightly due to a low battery charge or other reasons. But the values should be very close.

Use only the parameters listed in the tables for diagnosis. If a scan tool reads other parameters, the values are not recommended for use in diagnosis. Refer to Scan Tool Data Definitions for further detailed information.

Data Display

The scan tool's input display function can be helpful in determining if the electronic suspension control (ESC) module is receiving the correct input status. This can assist in determining if the ESC system is actually commanding a suspension damper solenoid.

Cycle Outputs

A scan tool may be used in order to command the suspension damper solenoids and SERVICE RIDE CONTROL message ON or OFF. This can be very helpful in determining if a certain portion of a circuit or a component is in working order. The following tests are available under the Special Functions selection. The following can be commanded ON or OFF:

    • Suspension damper solenoids
    • SERVICE RIDE CONTROL message

Electronic Suspension Control (ESC) Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Park brake set with the ignition switch ON/Ignition Switch in RUN/Engine running/Automatic Transmission in PARK/Air Conditioning is OFF

Battery Voltage Signal

Data

Volts

12.0-14.7 Volts -- varies with the vehicle

Compressor Signal, if equipped

Data

ON/OFF

OFF

Digital SWPS Phase A

Data

High/Low

Low

Digital SWPS Phase B

Data

High/Low

Low

Exhaust Signal, if equipped

Data

ON/OFF

OFF

Left Front Damper Actuator

Data

ON/OFF

OFF

Left Rear Damper Actuator

Data

ON/OFF

OFF

LF Position Sensor

Data

Volts

0.25 to 4.75

LR Position Sensor

Data

Volts

0.25 to 4.75

Marker Pulse

Data

High/Low

Low

Rear Leveling Air Pressure, if equipped

Data

PSI

-16.0 to 187.8

Rear Leveling Air Pressure, if equipped

Data

Volts

0.15 to 4.85

Right Front Damper Actuator

Data

ON/OFF

OFF

Right Rear Damper Actuator

Data

ON/OFF

OFF

RF Position Sensor

Data

Volts

0.25 to 4.75

RR Position Sensor

Data

Volts

0.25 to 4.75

Sensor Supply Voltage

Data

Volts

4.85

Vehicle Speed

Data

MPH

0