If you have completed the On-Board Diagnostic (OBD) system check, if the diagnostics are functioning properly, and if no DTCs are displayed, you may use the Typical Scan Values in the table below for comparison. These values are an average of display values recorded from normally operating vehicles.
Important: You should never use a scan tool that displays faulty data. The condition should be reported to the 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.
The values below were recorded under the following conditions:
| • | Engine at idle |
| • | Upper radiator hose is hot |
| • | Closed throttle |
| • | Park or Neutral |
| • | Closed Loop |
| • | Accessories OFF |
| • | Brake not applied |
Tech 2 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
Engine Torque | lb. ft./N·m | Varies |
TP Sensor | Volts | 0.20-0.74 volts |
TP Angle | % | 0% |
Engine Speed | RPM | Varies |
Transmission ISS | RPM | Varies |
Transmission OSS | RPM | 0 |
Vehicle Speed | mph (km/h) | 0/0 |
Current Gear | 1, 2, 3, 4 | 1 |
1-2 Sol. | On/Off | On |
2-3 Sol. | On/Off | Off |
Gear Ratio | Varies | 3.98 |
1-2 Sol. Open/Short to GND | Yes/No | No |
1-2 Sol. Short to Volts | Yes/No | No |
2-3 Sol. Open/Short to GND | Yes/No | No |
2-3 Sol. Short to Volts | Yes/No | No |
TFP Sw. A/B/C | On/Off | On/Off/Off |
ECT | °C (°F) | 85°-105°C (185°-220°F) |
IAT | °C (°F) | Varies |
Trans. Fluid Temp. | °C (°F) | 80°-90°C (176°-194°F) |
TFT Sensor | V | 2.37 V |
Hot Mode | On/Off | Off |
PC Sol. Actual Current | Amps | Varies |
PC Sol. Ref. Current | Amps | Varies |
PC Solenoid Duty Cycle | % | Varies |
Brake Switch | Open/Closed | Closed |
TCC Duty Cycle | % | 0% |
TCC Slip Speed | RPM | Varies |
TCC Release Pressure | Yes/No | Yes |
TCC Duty Cycle Open/Short to GND | Yes/No | No |
TCC Duty Cycle Short to Volts | Yes/No | No |
Last Shift Time | Seconds | Varies |
1-2 Shift Time | Seconds | Varies |
2-3 Shift Time | Seconds | Varies |
3-4 Shift Time | Seconds | Varies |
Adaptable Shift | Yes/No | No |
Engine Run Time | 0:00:00 | Varies |
Ignition Voltage | Volts | 12.6 - 14.0 |
Cruise | Disabled/Enabled | Disabled |
A/C Clutch | On/Off | Off |
