For 1990-2009 cars

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.

• | 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 Neutral

• | Closed Loop operation

• | Accessories OFF

• | Brake pedal not applied

Scan Tool Parameter | Data List | Units Displayed | Typical Data Value
--- | --- | --- | ---
Clutch Pedal Switch | F0, F3 | applied/released | released
Reverse Inhibit Solenoid Command | F0 | INHIBIT/OFF | OFF
Wheel Speed Sensor | ALL | km/h (mph) | 0
*Data List Legend

• | F0: Engine Data 1

• | F1: Engine Data 2

• | F2: Engine Data 3

• | F3: Cruise Control Data

• | F4: Enhanced EVAP Data

• | F5: Fuel Trim Data

• | F6: Misfire Data

• | F7: TAC Data

• | F8: H02S Data