GM Service Manual Online
For 1990-2009 cars only
Table 1: Scan Tool Data List (7.8L)
Table 2: Scan Tool Data List (8.1L)

Use the scan tool data values under the following conditions:

    • The Diagnostic System Check is complete.
    • The On-Board Diagnostics are functioning properly.
    • No DTCs are present.

The values below represent a typical display recorded from a properly functioning system.

Important: Do not use a scan tool that displays faulty data. Report the condition to the scan tool manufacturer. The use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of parts.

Only the parameters listed below are used in this manual for diagnosing. If a scan tool displays other parameters, the values are not recommended by General Motors for use in diagnosis.

Scan tool values below were recorded under the following conditions:

    • Engine at idle
    • Upper radiator hose hot
    • Closed throttle
    • Transmission in Neutral
    • Closed Loop operation
    • Accessories OFF
    • Brake pedal not applied

Scan Tool Data List (7.8L)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Clutch Pedal Switch

F0

Applied/Released

Released

Vehicle Speed Sensor

F0, F2

km/h (mph)

0

*Data List Legend

    • F0: Engine Data 1
    • F1: Engine Data 2
    • F2: Fuel System

Scan Tool Data List (8.1L)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Clutch Pedal Switch

F0

Applied/Released

Released

Vehicle Speed Sensor

F0, F2

km/h (mph)

0

*Data List Legend

    • F0: Engine Data 1
    • F1: Engine Data 2
    • F2: Fuel Trim Data
    • F3: Misfire Data
    • F4: TAC Data
    • F5: Cruise Control Data
    • F6: HO2S Data