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 |
• | Lower radiator hose is hot |
• | Closed throttle |
• | Park or Neutral |
• | Closed Loop |
• | Accessories OFF |
Tech 2 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 | 0.30-0.90V |
Throttle Angle | percent | 0% |
A/C Clutch | ON/OFF | OFF |
Cruise | Enabled/Disabled | Disabled |
Hot Mode | ON/OFF | OFF |
Adaptable Shift | Yes/No | No |
Current TAP Memory | -16 to +16 | varies |
Current TAP Cell | 0-16 | varies |
Long Shift Delay | Yes/No | No |
Long Shift Time | Yes/No | No |
TP Range | Normal/Exceeded | Normal |
Standard TAP | Yes/No | No |
VSS Delta | Normal/Exceeded | Normal |
TP Delta | Normal/Exceeded | Normal |
Engine Run Time | hr/min/sec | depends on time since start-up |
Ignition Volts | volts | 12-15V |
Gear Ratio | ratio | varies |
Current Gear | 1,2,3,4 | 1 |
ECT | C°(F°) | 85°-105°C (185°-220°F) |
Trans. Fluid Temp | C°(F°) | 82°-94°C (180°-200°F) |
TFT Sensor | volts | varies with the outside temperature |
TCC Slip Speed | RPM | +/- 50 RPM from the Engine Speed |
TCC Brake Switch | Applied/Released | Released |
TCC Duty Cycle | Percentage | 0% |
TCC Enable | Yes/No | No |
TCC Duty Cycle Open | Yes/No | No |
TCC Duty Cycle Short | Yes/No | No |
TCC Enable Open | Yes/No | No |
TCC Enable Shorted | Yes/No | No |
1-2 Sol. | On/Off | On |
2-3 Sol. | On/Off | On |
1-2 Sol. Open | Yes/No | No |
1-2 Sol. Shorted | Yes/No | No |
2-3 Sol. Open | Yes/No | No |
2-3 Sol. Shorted | Yes/No | No |
3-2 Downshift Sol. | On/Off | On |
3-2 Downshift Sol. Open | Yes/No | No |
3-2 Downshift Sol. Shorted | Yes/No | No |
1-2 Shift Time | seconds | 0.00 |
2-3 Shift Time | seconds | 0.00 |
1-2 Shift Time Error | seconds | 0.00 |
2-3 Shift Time Error | seconds | 0.00 |
3-4 Shift Time | seconds | 0.00 |
Last Shift Time | seconds | 0.00 |
Last Shift Time Error | seconds | 0.00 |
Speed Ratio | ratio | 0.00 |
Upshift Request | Yes/No | No |
Upshift | Yes/No | No |
Upshift | Yes/No | No |
Downshift Requested | Yes/No | No |
Downshift in Progress | Yes/No | No |
Downshift Desired | Yes/No | No |
3-2 Downshift Started | Yes/No | No |
3-2 Downshift in Progre | Yes/No | No |
Vehicle Speed | km/h, mph | 0, 0 |
Engine Speed | RPM | +/- 100 RPM from Desired Engine Speed |
PC Sol. Actual Current | amps | varies (0.1-1.1 amps) |
PC Sol. Ref Current | amps | varies (0.1-1.1 amps) |
PC Solenoid Duty Cycle | percentage | 40-60% |
KickDown Enabled | Yes/No | No |
Power Enrichment | Yes/No | No |
DTC Set This Ignition | Yes/No | No |
Transmission Range | Invalid, Reverse, Drive 4/OD, Drive 3/OD, Drive 2, Drive 1, Park/Neutral | Park, Neutral |
Traction Control | Inactive/Active | Inactive |
Transmission OSS | RPM | 0 |
TFP Switch | On/Off | Off/On/Off |