GM Service Manual Online
For 1990-2009 cars only

Typical Scan Tool Data Values

Use the typical Scan tool data values listed in this section for a comparison after the Instrument Cluster System Check and finding the system is functioning properly with no diagnostic trouble codes 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.

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.

    • Set parking brake (DRL and AHL Disabled)
    • Ignition in the RUN position
    • Engine running
    • Upper radiator hose hot
    • Closed loop
    • Automatic transmission in PARK
    • Manual transmission in NEUTRAL
    • Air conditioning OFF

Scan Tool Parameter

Units Displayed

Typical Data Value

Data Display

Data

Battery Voltage

Volts

13.8 Volts (Varies with vehicle) 12.0 volts - 14.7 volts

Vehicle Speed

Miles Per Hour/Kilometers

0 MPH

Engine Speed

Revolutions Per Minute (RPM)

500 - 700 RPM (Varies with Vehicle)

Monitored Coolant Temperature

Degree Fahrenheit/Celsius

190 °F (Fluctuates w/thermostat cycling 190°F)

Displayed Coolant Temperature

Degree Fahrenheit/Celsius

190°F

Monitored Trans Oil Temperature

Degree Fahrenheit/Celsius

100°F

Displayed Trans Oil Temperature

Degree Fahrenheit/Celsius

100°F

Monitored Fuel Level

Percentage

0 - 100 % (Varies with fuel tank level)

Displayed Fuel Level

Percentage

0 - 100 % (Varies with fuel tank level)

Displayed Odometer Mile

Miles/Kilometers

Miles (Varies with vehicles mileage)

Displayed Trip Odometer

Miles/Kilometers

Miles (Varies with vehicles mileage)

Hour Meter

Hours

XXX hrs (Varies with vehicles hours)

Inputs

PRNDL State

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

Park

Dimming

Active / Inactive

Inactive

Park Switch

Open / Closed

Closed

Trip Reset Switch

Active / Inactive

Inactive

Outputs

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

Low Fuel Lamp

ON/OFF

OFF

Oil Pressure Lamp

ON/OFF

OFF

Change Engine Oil

ON/OFF

OFF

Check Coolant Temp Lamp

ON/OFF

OFF

Service 4WD

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

Special Functions

Lamp Test

Volt Lamp

ON/OFF

--

Low Fuel Lamp

ON/OFF

--

Engine Over-Heated

ON/OFF

--

Low Washer Fluid Lamp

ON/OFF

--

Oil Pressure Lamp

ON/OFF

--

Service 4WD Lamp

ON/OFF

--

Change Oil Lamp

ON/OFF

--

ABS Lamp

ON/OFF

--

Brake Lamp

ON/OFF

--

Security Lamp

ON/OFF

--

Seat Belt Lamp

ON/OFF

--

High Beam Lamp

ON/OFF

--

Upshift Lamp

ON/OFF

--

IPC Gauges

Coolant Gauge Sweep Test

UP/DOWN

--

Fuel Gauge Sweep Test

UP/DOWN

--

Speed Gauge Sweep Test

UP/DOWN

--

Tach Gauge Sweep Test

UP/DOWN

--

Trans Oil Temp Gauge Sweep Test

UP/DOWN

--

PRNDL Display

Park

ON/OFF

--

Reverse

ON/OFF

--

Neutral

ON/OFF

--

Drive

ON/OFF

--

3rd

ON/OFF

--

2nd

ON/OFF

--

1st

ON/OFF

--