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 Scan Values |
|---|---|---|
1-2 Shift Error | seconds | varies |
1-2 Shift Time | seconds | varies |
1-2 Sol. | On/Off | On |
1-2 Sol. Open | Yes/No | No |
1-2 Sol. Shorted | Yes/No | No |
2-3 Shift Error | seconds | varies |
2-3 Shift Time | seconds | varies |
2-3 Sol. | On/Off | On |
2-3 Sol. Open | Yes/No | No |
2-3 Sol. Shorted | Yes/No | No |
3-4 Shift Error | seconds | varies |
3-4 Shift Time | seconds | varies |
A/C Clutch | On/Off | Off |
Adaptable Shift | Yes/No | No |
Brake Switch | Open/Closed | Closed |
Cruise | Enabled/Disabled | Disabled |
Current Gear | 1, 2, 3, 4 | 1 |
Current TAP Cell | 0-16 | varies |
Current TAP Memory | kPa(psi) | varies |
ECT | °C (°F) | 85-105°C (185-220°F) (varies with the outside temperature) |
Engine Run Time | hours/minutes/seconds | depends on time since start-up |
Engine Speed | RPM | 100 RPM from PCM commanded idle speed (varies with the temperature) |
Engine Torque | N·m(lb ft) | 28-33 N·m(20-25 lb ft) |
Gear ratio | Ratio | 7.99 |
Hot Mode | Yes/No | No |
IAT | °C (°F) | 0-90°C (32-194°F) |
Ignition Voltage | volts | 12-14V |
Last Shift Time | seconds | varies |
PC Sol. Actual Current | amps | 1.01 amps |
PC Solenoid Duty Cycle | percent | 58-68% |
PC Sol. Ref. Current | amps | 1.01 amps |
Shift Mode | Normal/Performance | Normal |
TAP % of TP | kPa(psi) | varies |
TCC Duty Cycle | percent | 0% |
TCC Duty Cycle Open | Yes/No | No |
TCC Duty Cycle Short | Yes/No | No |
TCC Release Pressure | Yes/No | Yes |
TCC Slip Speed | RPM | same as Engine Speed |
TFP Automatic Transmission Fluid Pressure Manual Valve Position Sw. A/B/C | On/Off | On/Off/Off |
TFT Sensor | volts | 1.95-2.80V (varies with the outside temperature) |
TP Angle | percent | 0% |
TP Sensor | volts | 0.20-0.74V |
Traction Control | Inactive/Active | Inactive |
Trans. Fluid Temp. | °C (°F) | 70-90°C (158-194°F) (varies with the outside temperature) |
Transmission ISS | RPM | 0 |
Transmission OSS | RPM | 0 |
Vehicle Speed | km/h (mph) | 0 |
