GM Service Manual Online
For 1990-2009 cars only
Table 1: Transmission Scan Tool Data List - 8.1L Gas
Table 2: Transmission Scan Tool Data List - 6.6L Diesel (LLY)

Use the scan tool data list under the following conditions:

    • The Diagnostic System Check - Vehicle in Vehicle DTC Information is complete.
    • The On-Board Diagnostics are functioning properly.
    • No diagnostic trouble codes (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 PARK
    • Closed Loop operation
    • Accessories OFF
    • Brake pedal not applied

Transmission Scan Tool Data List - 8.1L Gas

Scan Tool Parameter

Data List*

Units Displayed

Typical Data Value

Clutch Pedal Switch

F0, F6

Applied/Released

Released

Vehicle Speed Sensor

ALL

km/h (mph)

0

*Data List Legend

    • F0: Engine Data 1
    • F1: Engine Data 2
    • F2: Fuel Trim Data
    • F3: Misfire Data
    • F4: Enhanced EVAP Data
    • F5: TAC Data
    • F6: Cruise Control Data
    • F7: HO2S Data

Transmission Scan Tool Data List - 6.6L Diesel (LLY)

Scan Tool Parameter

Data List*

Units Displayed

Typical Data Value

Clutch Pedal Switch

F0, F3

Applied/Released

Released

Vehicle Speed Sensor

F0, F2, F3

km/h (mph)

0

*Data List Legend

    • F0: Engine Data 1
    • F1: Engine Data 2
    • F2: Fuel Data
    • F3: EGR Data
    • F4: TC Data