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 1 Parameter | Units Displayed | Typical Scan Values |
|---|---|---|
MAP | kPa, V | 20-48 kPa, 1-2V, depending upon altitude |
BARO | kPa, V | 70-100 kPa, 3.5-4.5V, depending upon altitude |
TP Sensor | volts | 0.30-0.90V |
TP Angle | percent | 0% |
A/C Clutch | ON/OFF | OFF |
Cruise Enabled | ON/OFF | OFF |
Hot Mode | ON/OFF | OFF |
Adaptable Shift | Yes/No | No |
Curr TAP Memory | -16 to +16 | varies |
Current TAP | 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 1 | volts | 13-15V |
Gear Ration | ratio | varies |
Current Gear | 1,2,3,4 | 1 |
ECT | C°(F°) | 85°-105°C (185°-220°F) |
TFT | 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 Sw | Applied/Released | Released |
TCC Duty Cycle | Percentage | 0% |
TCC Enable | On/Off | Off |
TCC Duty Open | Yes/No | No |
TCC Duty Shorted | Yes/No | No |
TCC Enable Open | Yes/No | No |
TCC Enable Short | 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. Short | Yes/No | No |
2/3 Sol. Open | Yes/No | No |
2/3 Sol. Short | Yes/No | No |
3/2 Down Shift | Yes/No | No |
3/2 DS Open | Yes/No | No |
3/2 DS Shorted | Yes/No | No |
1/2 Shift Time | seconds | 0.00 |
2/3 Shift Time | seconds | 0.00 |
1/2 Shift Error | seconds | 0.00 |
2/3 Shift Error | seconds | 0.00 |
3/4 Shift Time | seconds | 0.00 |
Latest Shift | seconds | 0.00 |
Latest Shift Err | seconds | 0.00 |
Speed Ratio | ratio | 0.00 |
Upshift Request | Yes/No | No |
Upshift in Prog | Yes/No | No |
Upshift Desired | Yes/No | No |
DS Requested | Yes/No | No |
DS in Progress | Yes/No | No |
DS Desired | Yes/No | No |
3/2 Started | Yes/No | No |
3/2 in Progress | Yes/No | No |
Vehicle Speed | km/h, mph | 0, 0 |
Engine Speed | RPM | +/- 100 RPM from Desired Engine Speed |
PC Act. Current | amps | varies (0.1-1.1 amps) |
PC Ref Current | amps | varies (0.1-1.1 amps) |
PC Duty Cycle | percentage | 40-60% |
Power Enrichment | Yes/No | No |
KickDown Enabled | Yes/No | No |
DTC Set This Ign | Yes/No | No |
TR Switch | Invalid, Reverse, Overdrive, Dr 3, Dr 2, Low, Park | Park, Neutral |
Traction Control | Inactive/Active | Inactive |
Trans. OSS | RPM | 0 |
TFP Switch | On/Off | Off/On/Off |
TCC Stator Temp | Normal/High | Normal |
