GM Service Manual Online
For 1990-2009 cars only
Table 1: Instrument Cluster Scan Tool Data List
Table 2: Instrument Cluster Scan Tool Outputs

Refer to the below data tables when one of the following conditions exist:

    • The Instrument Cluster 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 the Scan tool data definitions for further detailed information.

Typical Scan Tool Data Display

Preliminary Settings: The following preliminary settings must be set in order to achieve the same typical data values listed in the table.

    • The parking brake is set with the ignition switch in the OFF position (DRL and AHL Disabled).
    • The Ignition switch in the RUN position.
    • The engine is running.
    • The automatic transmission is in the PARK position.
    • The manual transmission is in the NEUTRAL position
    • The air conditioning is OFF.

Instrument Cluster Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Vehicle Speed

Data

Miles Per Hour (MPH) / Kilometers

0 MPH

Module Part number

Module Information

Numeric

XXXXXXXXX (Varies with the vehicle)

Engine Speed

Data

Revolutions Per Minute (RPM)

500-700 RPM (Varies with the vehicle)

Monitored Coolant Temperature

Data

Degrees Fahrenheit (°F) / Celsius (°C)

190°F (Fluctuates range 180-200°F)

87°C (Fluctuates range 82-93°C)

Displayed Coolant Temperature

Data

Degrees Fahrenheit (°F) / Celsius (°C)

190°F (87°C)

Monitored Fuel Level

Data

Percentage (%)

0-100% (Varies with the fuel tank level)

Displayed Fuel Level

Data

Percentage (%)

0-100% (Varies with the fuel tank level)

Displayed Odometer Mile

Data

Miles / Kilometers

XXX,XXX Miles (Varies with the mileage of the vehicle)

Displayed Trip Odometer

Data

Miles / Kilometers

XXX,XXX Miles (Varies with the mileage of the vehicle

Battery Voltage

Data

Volts

12.0 - 14.7 Volts (varies with the vehicle)

PRNDL STATE

Inputs

Park / Reverse / Neutral / Drive / Third / Second / First / Invalid

Park

Dimming

Inputs

Active / Inactive

Active (when the park lamps are ON)

Park Switch

Inputs

Open / Closed

Closed

Trip Reset Switch

Inputs

Active / Inactive

Inactive

Instrument Cluster Scan Tool Outputs

Scan Tool Parameter

Units Displayed

Typical Data Value

Important:: The output table shown below does not list all of the instrument cluster LEDs. The instrument cluster LEDs not listed are controlled by a different device. Refer to the applicable device when diagnosing instrument cluster LEDs not shown in the table below.

Low Fuel Lamp

ON/OFF

OFF

Service 4WD

ON/OFF

OFF

Overspeed Lamp

ON/OFF

OFF

ABS Lamp

ON/OFF

OFF

Brake Lamp

ON/OFF

OFF

Fasten Seat Belts

ON/OFF

OFF

Security Lamp

ON/OFF

OFF

Upshift Lamp

ON/OFF

OFF

High Beam Lamp

ON/OFF

OFF

Battery

ON/OFF

OFF

Air Bag Lamp

ON/OFF

OFF