Tech 1 Data Value Examples VIN M
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 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.
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.
Scan tests are performed under the following driving conditions:
| • | Idle |
| • | Upper radiator hose is hot |
| • | Closed throttle |
| • | Park or Neutral |
| • | Closed Loop |
| • | Accessories OFF |
| • | Brake not applied |
Tech 1 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
MAF | g/s | 3-6 g/s at idle; 13-16 g/s at 2500 RPM, depending upon load and BARO |
MAP | kPa, V | 29-48 kPa, 1-2V, depending upon load and BARO |
TP Sensor | volts | 0.20-0.74V |
TP Angle | percent | 0% |
Engine Run Time | seconds | depends on time since startup |
ECT | C°(F°) | 85°-105°C (185°-220°F) (varies with the outside temperature) |
TFT | C°(F°) | 70°-90°C (158°-194°F) (varies with the outside temperature) |
TFT Sensor | volts | 1.95-2.80V (varies with the outside temperature) |
Engine Speed | RPM | 100 RPM from PCM commanded idle speed (varies with the temperature) |
Trans. OSS | RPM | 0 |
TCC PWM Solenoid | percent | 9% |
TCC Enable | On/Off | Off |
TCC Slip Speed | RPM | same as Engine Speed |
TCC Brake Sw | Open/Closed | Closed |
TCC Enable Open | On/Off | Off |
TCC Enable Short | On/Off | Off |
TCC PWM Open | Yes/No | No |
TCC PWM Short | Yes/No | No |
Vehicle Speed | mph (km/h) | 0 |
1/2 Sol. | On/Off | On |
2/3 Sol. | On/Off | On |
Current Gear | 1, 2, 3, 4 | 1 |
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 |
Hot Mode | On/Off | Off |
A/C Clutch | On/Off | Off |
Cruise Enabled | On/Off | Off |
Gear Ratio | ratio | 2.91:1 |
Speed Ratio | ratio | 255 |
2 Gear Start Lamp | On/Off | Off |
Traction Control | Not Available | -- |
