GM Service Manual Online
For 1990-2009 cars only

The RTD scan tool data list contains all the real time damping 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 RTD 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 RTD Diagnostice System Check. Use the RTD scan tool data list only after the following is determined:

    • The RTD 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 ESC module is receiving the correct input status. This can assist in determining if the RTD system is actually commanding a shock absorber.

Cycle Outputs

A scan tool may be used in order to command the shock solenoids, leveling compressor, EVO solenoid 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:

    • EVO actuator
    • Exhaust
    • Compressor
    • RTD solenoids
    • SERVICE RIDE CONTROL message

RTD 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

Data

Volts

12.0 - 14.7 Volts (varies with the vehicle)

Compress Relay Enable

Data

ON/OFF

OFF

EVO Actuator Desired @ 0 MPH

Data

ma

0

EVO Actuator Actual @ 0 MPH

Data

ma

0

EVO Actuator Desired @ 65 MPH

Data

ma

0

EVO Actuator Actual @ 65 MPH

Data

ma

0

Exhaust Signal

Data

ON/OFF

OFF

Ignition 3 Voltage

Data

Volts

12.0 - 14.7 Volts (varies with the vehicle)

RTD Air Pressure Sensor

Data

Volts

0.15 to 4.85

RTD Module ID

Data

--

Varies with the vehicle

RTD Position Sensor LF

Data

Volts

0.5 to 4.85

RTD Position Sensor LR

Data

Volts

0.5 to 4.85

RTD Position Sensor RF

Data

Volts

0.5 to 4.85

RTD Position Sensor RR

Data

Volts

0.5 to 4.85

(RTD) SERVICE RIDE CONTROL message

Outputs

ON/OFF

OFF

RTD Solenoid LF

Data

ON/OFF

OFF

RTD Solenoid LR

Data

ON/OFF

OFF

RTD Solenoid RF

Data

ON/OFF

OFF

RTD Solenoid RR

Data

ON/OFF

OFF

Sensor Supply Voltage

Data

Volts

4.8 to 5.2

Steering Position Sensor 1

Data

Volts

0.35 to 4.7

Steering Position Sensor 2

Data

Volts

0.35 to 4.7

Vehicle Speed

Data

MPH

0