If you have completed the On-Board Diagnostic (OBD) system check, if the diagnostics are functioning properly and if no DTCs display, you may use the values in the table below for comparison within the appropriate transmission. These typical values are an average of display values recorded from normally operating vehicles. They represent the display from a normally functioning system.
Never use a scan tool that displays faulty data. The condition should be reported to the manufacturer. 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:
| • | Idle |
| • | Upper radiator hose is hot |
| • | Closed throttle |
| • | Park or Neutral |
| • | Closed Loop |
| • | Accessories OFF |
| • | Brake not applied |
Tech 2 Parameter | Units Displayed | Typical Data Values |
|---|---|---|
1-2 Sol. | On/Off | On |
1-2 Sol. Open | Yes/No | No |
1-2 Sol. Shorted | Yes/No | No |
2-3 Sol. | On/Off | On |
2-3 Sol. Open | Yes/No | No |
2-3 Sol. Shorted | Yes/No | No |
A/C Clutch | On/Off | Off |
Brake Sw | Open/Closed | Closed |
Cruise | Enable/Disable | Disable |
Current Gear | 1, 2, 3, 4 | 1 |
ECT | °C (°F) | 85-105°C (185-220°F) (varies with the outside temperature) |
Engine Run Time | hour/minute/second | depends on time since startup |
Engine Speed | RPM | 100 RPM from PCM commanded idle speed (varies with the temperature) |
Engine Torque | N·m (lb ft.) | 0-2 N·m (0-3 lb ft.) |
Gear ratio | 0.00 | varies |
Hot Mode | On/Off | Off |
IAT | °C (°F) | 0-90°C (32-194°F) |
Ignition Voltage | V | 12-14 V |
Shift Mode | Normal/Performance | Normal |
TCC Duty Cycle | % | 0% |
TCC Duty Cycle Open | Yes/No | No |
TCC Duty Cycle Short | Yes/No | No |
TCC Slip Speed | RPM | same as Engine Speed |
Trans. Fluid Temp. | °C (°F) | 70-90°C (158-194°F) (varies with the outside temperature) |
TFT Sensor | V | 1.95-2.80 V (varies with the outside temperature) |
TP Angle | % | 0% |
TP Sensor | V | 0.20-0.74 V |
Traction Control | Inactive/Active | Inactive |
Transmission OSS | RPM | 0 |
Vehicle Speed | mph (km/h) | 0 |
TCC Enable | Yes/No | No |
TCC Enable Open | Yes/No | No |
TCC Enable Shorted | Yes/No | No |
Speed Ratio | 0.00 | varies |
