| Table 1: | At-1 Data List |
| Table 2: | At-2 Data List |
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 Typical Scan Values in the table below for comparison. These typical values are an average of display values recorded from normally operating vehicles. They represent the display from a normally functioning system.
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.
Scan tests are performed under the following driving conditions:
| • | Engine idling |
| • | Upper radiator hose is hot |
| • | Closed throttle |
| • | Transmission is in Park |
| • | Closed Loop |
| • | Accessories OFF |
Tech-1® Parameter | Units Displayed | Typical Data Value |
|---|---|---|
TP Angle | % | 0% |
Engine Torque | N·m (lb ft) | -- |
Boost Pressure | kPa | 0 |
Boost Sol PWM | % on time | 0% |
Gear Ratio | -- | 3.99:1 |
Speed Ratio | 1/m | -- |
1-2 Sol Open | On/Off | Off |
2-3 Sol Open | On/Off | Off |
1-2 Sol Short | On/Off | Off |
2-3 Sol Short | On/Off | Off |
DS Desired | Yes/No | No |
Latest Shift | Seconds | 0.00 |
DS Requested | Yes/No | No |
DS In Progress | Yes/No | No |
Upshift | Yes/No | No |
Upshift Desired | Yes/No | No |
Shift Delay | Seconds | 0.00 |
Upshift Request | Yes/No | No |
3-4 Shift Time | Seconds | 0.00 |
3-4 Shift Error | Seconds | 0.00 |
1-2 Shift Error | Seconds | 0.00 |
2-3 Shift Error | Seconds | 0.00 |
1-2 Shift Time | Seconds | 0.00 |
2-3 Shift Time | Seconds | 0.00 |
1-2 Sol/ 2-3 Sol | On/Off | On/Off |
Current Gear | 1-4 | 1 |
TCC PWM | % On Time | 0 |
TCC PWM Short | On/Off | Off |
TCC Delta TP | Yes/No | No |
TCC Apply | Seconds | 0.00 |
TCC Out of Range | Yes/No | No |
TCC Min TP | Yes/No | No |
TCC Slip Speed | RPM | @650 |
Brake Switch | Applied/Released | Released |
TCC Duty Cycle | % On Time | 0 |
TCC Slip Speed | RPM | @650 |
Trans OSS | RPM | 0 |
Vehicle Speed | km/h (mph) | 0 (0) |
Turbine Speed | RPM | @650 |
Engine Speed | RPM | @650 |
Trans ISS | RPM | @650 |
Trans OSS | RPM | 0 |
TFT | °C (°F) | 91°C (195°F) |
TFT Sensor | Volts | 3.00 |
Engine Run Time | Hours/Minutes/Seconds | -- |
ECT | °C (°F) | -- |
Tech-1® Parameter | Units Displayed | Typical Data Value |
|---|---|---|
TP Angle | % | 0 |
Engine Torque | N·m (lb ft) | varies with engine RPM |
TP Angle | % | 0 |
PC Act Current | Amps | .96 |
PC Sol Low Volts | Normal/Exceeded | Normal |
PC Act Current | Amps | .96 |
PC Duty Cycle | % On Time | 57% |
TP Angle | % | 0 |
PC Ref Current | Amps | .96 |
PC Act Current | Amps | .96 |
Kickdown Enabled | On/Off | Off |
Power Enrichment | Yes/No | No |
Cruise Enabled | On/Off | Off |
A/C Clutch | On/Off | Off |
TR Switch | Invalid/Selected Gear | Park/Neutral |
Power Enrichment | Yes/No | No |
TR Switch | On/Off | Off/On/Off |
A/B/C | -- | -- |
Standard Tap | Yes/No | Yes |
Max Tap | Yes/No | No |
Adaptable Shift | Yes/No | No |
Tap Shift Torque | Normal/Exceeded | Normal |
Current Tap Memory | -16 to +16 | 8 |
Current Tap | 0-255 | -- |
VSS Delta | Yes/No | No |
Max Tap | Yes/No | No |
Long Shift Time | Yes/No | No |
TP Delta | Yes/No | No |
Adaptable Shift | Yes/No | No |
Long Shift Delay | Yes/No | No |
Hot Mode | On/Off | Off |
Current Tap | 0-255 | -- |
Front Axle Switch | Locked/Unlocked | Unlocked |
Curr. DTC Set | Yes/No | No |
4WD Low | On/Off | Off |
4WD High | Yes/No | No |
Latest Shift | Seconds | 0.00 |
Shift Delay | Seconds | 0.00 |
Ignition Volts | Volts | 13-15 |
Odometer | Miles | Same as IP |
Engine Run Time | Hours/Minutes/Seconds | -- |
Trans Fluid Temp | °C (°F) | 91°C (195°F) |
