GM Service Manual Online
For 1990-2009 cars only

Use the scan tool data values under the following conditions:

    • The Diagnostic System Check - Vehicle in Vehicle DTC Information is complete.
    • The On-Board Diagnostics are functioning properly.
    • There are no diagnostic trouble codes (DTCs) 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 Parameter

*Data List

Units Displayed

Typical Data Value

Vehicle Speed

1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12

km/h (mph)

0

*Data List Legend

    • Engine Data (1)
    • EVAP Data (2)
    • Fuel Trim Data (3)
    • H02S Data (4)
    • Ignition Data (5)
    • Misfire Data (6)
    • TAC Data (7)
    • HVAC Data (8)
    • Cruise Control Data (9)
    • Electrical/Theft Data (10)
    • IPC Data (11)
    • I/M Data (12)