| Table 1: | At-1 Data List |
| Table 2: | At-2 Data List |
| Table 3: | At-3 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 Scan Values |
|---|---|---|
Map | kPa | 41 kPa |
Baro | kPa | 100 kPa |
mph | Miles per hour | 0 |
km/h | Kilometers per hour | 0 |
Trans. OSS | RPM | 0 |
TCC Duty Open | Yes/No | No |
TCC Duty Shorted | Yes/No | No |
Brake Switch | Closed/Open | Closed |
TCC Slip Speed | RPM | -50 to -70 RPM |
TCC Duty Cycle | Percent on time | 0% |
Turbine Speed | RPM | 680 RPM |
Input Speed | RPM | 680 RPM |
Engine Speed | RPM | 610 RPM |
TFT | °C (°F) | 65°C (149°F) |
TFT Sensor | Volts | 3.00 V |
Current DTC Set | Yes/No | No |
ECT Sensor | Volts | 1.76 V |
Desired Idle | RPM | 600 RPM |
TP Sensor | Volts | 0.59 V |
TP Angle | Percent applied | 0% |
Tech 1 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
MAP Sensor | Volts | 1.67 V |
TP Sensor | Volts | 0.59 V |
VSS Delta | Yes/No | No |
Max TAP | Yes/No | No |
Adaptable Shift | Yes/No | No |
TP Delta | Yes/No | Yes |
Long Shift Time | Yes/No | No |
Current TAP | 0-16 | 4 |
Hot Mode | Yes/No | No |
4WD | Yes/No | No (for Diesel only) |
Current DTC Set | Yes/No | No |
Power Enrichment | Yes/No | No |
4WD Low | Yes/No | No |
A/C Clutch | Yes/No | No |
KickDown Enabled | Yes/No | No |
Cruise Enabled | Yes/No | No |
TFP Switch | On/Off | A-On/B-Off/C-On |
PC Act. Current | amps | 0.96 amps |
PC Sol. Low Volts | Normal/Exceeded | Normal |
PC Duty Cycle | Percent on time | 57% |
TP Angle | Percent applied | 0% |
PC Ref. Current | amps | 0.96 amps |
TFT Sensor | Volts | 2.88 V |
ECT Sensor | Volts | 1.75 V |
ECT | °C (°F) | 97°C (207°F) |
TFT | °C (°F) | 69°C (156°F) |
Ignition 1 | Volts | 13-15 V |
Engine Run Time | Hr:Min:Sec | 00:00:00 |
Tech 1 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
Map | kPa | 41 kPa |
Baro | kPa | 100 kPa |
TP Sensor | Volts | 0.59 V |
TP Angle | Percent applied | 0% |
ECT Sensor | Volts | 1.75 V |
TFT Sensor | Volts | 2.80 V |
Trans. Range | PRNDL Position | P/N |
Current DTC Set | Yes/No | No |
mph | Miles per hour | 0 |
km/h | Kilometers per hour | 0 |
Trans. OSS | RPM | 0 |
Turbine Speed | RPM | 650 RPM |
Input Speed | RPM | 650 RPM |
1/2 Sol. | On/Off | On |
2/3 Sol. | On/Off | Off |
Current Gear | 1-4 (Drive range gears) | 1 |
1-2 Shift Time | Seconds | Varies |
2-3 Shift Time | Seconds | Varies |
1-2 Shift Error | Seconds | Varies |
2-3 Shift Error | Seconds | Varies |
3-4 Shift Time | Seconds | Varies |
3-4 Shift Error | Seconds | Varies |
3-2 DS Sol. | N/A | -- |
1-2 Sol. Open | Yes/No | No |
1-2 Sol. Short | Yes/No | No |
2-3 Sol. Open | Yes/No | No |
2-3 Sol. Short | Yes/No | No |
Shift Delay | Seconds | Varies |
Speed Ratio | Engine speed:Output speed | 8.00:1 |
Shift Pattern | 0-8 | 8 |
Start of Shift | Yes/No | Yes |
End of Shift | Yes/No | Yes |
Upshift | Yes/No | Yes |
Shift Completed | Yes/No | Yes |
Gear Ratio | Measured Ratio | 3.98:1 |
Turbine Speed | RPM | 650 RPM |
