| Table 1: | Engine 1 |
| Table 2: | Engine 2 |
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 |
| • | Accelerator OFF |
| • | Brake not applied |
Parameters that are marked with an (*) asterist are also valid in the Engine 2 list.
Tech 1 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
*Engine Speed | RPM | +/-100 RPM from the desired RPM |
*Desired Idle | RPM | Varies |
*ECT | C°(F°) | 85°-115°C (185°-239°F) (Varies with coolant temperature) |
*MAP | kPa, V | 1-3V (Varies with vacuum and Baro pressure) |
*Baro | kPa, V | 3-5V (Varies with altitude and Baro pressure) |
*TP Sensor | V | 0.200-0.900V |
*TP Angle | % | 0% |
*Ignition Volts | V | 12.0-15.0V |
Loop Status | Open/Closed | Closed |
TCC Brake Switch | On/Off | Off |
Engine Run Time | Hr:Min:Sec | Varies since start up |
# of Current DTCs | # | 0 |
Tech 1 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
A/C Request | Yes/No | No |
Cruise Engaged | Yes/No | No |
TCC Enable | On/Off | Off |
TCC Slip Speed | RPM | Varies |
Trans. OSS | RPM | 0 |
PNP | P/N, R/DL | P/N |
km/h (mph) | km/h (mph) | 0 |
