For 1990-2009 cars

## 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

#### Typical Scan Tool Data Values

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 | --