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 Tool Data 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 problem 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 is at Idle |
| • | Upper radiator hose is hot |
| • | Closed throttle |
| • | Gear is in Park or Neutral |
| • | Closed Loop |
| • | Accessories are OFF |
Tech 2 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
Engine Torque | lb ft/N·m | varies |
TP Sensor | volts | 0.3-0.9V |
TP Angle | percent | 0% |
Engine Speed | RPM | varies |
Transmission OSS | RPM | 0 |
Vehicle Speed | mph (km/h) | 0 |
Current Gear | 1,2,3,4 | 1 |
1-2 Sol. | On/Off | On |
2-3 Sol. | On/Off | On |
3-2 Downshift Sol. | On/Off | On |
Speed Ratio | Ratio | 8.00:1 |
1-2 Sol. Open | Yes/No | No |
1-2 Sol. Shorted | Yes/No | No |
2-3 Sol. Open | Yes/No | No |
2-3 Sol. Shorted | Yes/No | No |
3-2 Downshift Sol. Open | Yes/No | No |
3-2 Downshift Sol. Shorted | Yes/No | No |
TFP Sw. A/B/C | On/Off | Off/On/Off |
Trans. Fluid Temp. | C°(F°) | varies |
TFT Sensor | volts | varies |
ECT | C°(F°) | Varies |
Transmission Hot Mode | On/Off | Off |
PC Sol. Actual Current | amps | varies (0.1-1.1 amps) |
PC Sol. Ref. Current | amps | varies (0.1-1.1 amps) |
PC Sol. Duty Cycle | percentage | varies |
TCC Brake Switch | Closed/Open | Closed |
TCC Enable | Yes/No | No |
TCC Duty Cycle | Percentage | 0% |
TCC Slip Speed | RPM | +/- 50 RPM from the Engine Speed |
TCC Enable Open | Yes/No | No |
TCC Enable Shorted | Yes/No | No |
TCC Duty Cycle Open | Yes/No | No |
TCC Duty Cycle Shorted | Yes/No | No |
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 | hr/min/sec | varies |
Ignition Voltage | Volts | varies |
Cruise | Enabled/Disabled | Disabled |
A/C Clutch | On/Off | Off |
4WD | Enabled/Disabled | Disabled |
4WD Low | Enabled/Disabled | Disabled |
Power Take Off | Yes/No | No |
1-2 Shift Error | seconds | varies |
2-3 Shift Error | seconds | varies |
3-4 Shift Error | seconds | varies |
Current TAP | 0-16 | varies |
Maximum TAP | Yes/No | No |
Last TAP | psi | varies |
TAP % of TP | psi | varies |
