GM Service Manual Online
For 1990-2009 cars only
Table 1: Transmission Scan Tool Data List - 4.3L
Table 2: Transmission Scan Tool Data List - 4.8L

Use the scan tool data values under the following conditions:

    • The Powertrain On-Board Diagnostic (OBD) 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

Transmission Scan Tool Data List - 4.3L

Scan Tool Parameter

Data List*

Units Displayed

Typical Data Values

Clutch Pedal Switch

F0, F1

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: H02S Data

Transmission Scan Tool Data List - 4.8L

Scan Tool Parameter

Data List*

Units Displayed

Typical Data Values

Clutch Pedal Switch

F1

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: H02S Data
    • F6: Cruise Control Data
    • F7: TAC Data