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 1 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
MAP | kPa | 20-48 kPa, depending upon altitude |
BARO | kPa | 70-100 kPa, depending upon altitude |
TP Sensor | volts | 0.3-0.9V |
TP Angle | percent | 0% |
Engine Speed | RPM | +/- 100 RPM from Desired Idle |
Desired Idle | RPM | +/- 100 RPM from Engine Speed |
Current DTC Set | Yes/No | No |
ECT Sensor | volts | varies |
TFT | C°(F°) | varies |
TFT Sensor | volts | varies |
Trans. OSS | RPM | 0 |
TCC Duty Cycle | Percentage | 0% |
TCC Enable | Yes/No | No |
TCC Slip Speed | RPM | +/- 50 RPM from the Engine Speed |
Brake Switch | Closed/Open | Closed |
TCC Ramp | Seconds | 0.00 |
TCC Apply | Seconds | 0.00 |
TCC Out of Range | Yes/No | No |
TCC Min. TP | Yes/No | No |
TCC Delta TP | Yes/No | No |
TCC Duty Open | Yes/No | No |
TCC Duty Shorted | Yes/No | No |
TCC Enable Open | Yes/No | No |
TCC Enable Short | Yes/No | No |
mph (km/h) | 0-158 (0-255) | 0 |
MAP Sensor | Volts | 1-2V, depending on altitude |
Engine Run Time | hr/min/sec | varies |
Ignition 1 | Volts | varies |
ECT | C°(F°) | varies |
PC Act. Current | amps | varies (0.1-1.1 amps) |
PC Ref. Current | amps | varies (0.1-1.1 amps) |
PC Duty Cycle | percentage | varies |
PC Sol. Low Volts | Normal/Low Volts | Normal |
TFP Switch A/B/C | On/Off | Off/On/Off |
Power Enrichment | Yes/No | No |
Cruise Enabled | Yes/No | No |
A/C Clutch | Yes/No | No |
Kickdown Enabled | Yes/No | No |
4WD Low | Yes/No | No |
4WD | Yes/No | No |
Current TAP | 0-16 | 0 |
Hot Mode | Yes/No | No |
Adaptable Shift | Yes/No | No |
Long Shift Delay | Yes/No | No |
Long Shift Time | Yes/No | No |
TP Range | Yes/No | Yes |
TP Delta | Yes/No | No |
VSS Delta | Yes/No | No |
Max TAP | Yes/No | No |
Trans. Range | Error, Rev, Overdrive, Drive3, Drive 2, Low 1, P/N | P/N |
Turbine Speed | N/A | -- |
Input Speed | N/A | -- |
Current Gear | 1,2,3,4 | 1 |
1-2 Sol. 2-3 Sol. | On/Off | On/On |
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. | Yes/No | No |
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 | 0.00 |
Speed Ratio | Ratio | 8.00:1 |
Shift Pattern | number | 8 |
Start of Shift | Yes/No | Yes |
End of Shift | Yes/No | Yes |
Upshift | Yes/No | No |
Shift Completed | Yes/No | Yes |
Gear Ratio | N/A | -- |
