Use the scan tool data values under the following conditions:
| • | The Diagnostic System Check is complete. |
| • | The On-Board Diagnostics are functioning properly. |
| • | No diagnostic trouble codes (DTCs) are present. |
The values below represent a typical display recorded from a properly functioning system.
Important: Do not use a scan tool that displays faulty data. Report the condition to the scan tool 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 tool values below were recorded under the following conditions:
| • | Engine at idle |
| • | Upper radiator hose hot |
| • | Closed throttle |
| • | Transmission in Park |
| • | Closed Loop operation |
| • | Accessories OFF |
| • | Brake pedal not applied |
Scan Tool Parameter | Data List* | Units Displayed | Typical Data Value | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1-2 Shift Time Error | F2 | Seconds | Varies | ||||||||||||||||||
1-2 Shift Time | F0, F2 | Seconds | Varies | ||||||||||||||||||
1-2 Sol. | F0, F2, F3, F4 | On/Off | On | ||||||||||||||||||
1-2 TAP Cell 4-16 | F6/F0 | kPa (psi) | Varies | ||||||||||||||||||
2-3 Shift Time Error | F3 | Seconds | Varies | ||||||||||||||||||
2-3 Shift Time | F0, F3 | Seconds | Varies | ||||||||||||||||||
2-3 Sol. | F0, F2, F3, F4 | On/Off | Off | ||||||||||||||||||
2-3 TAP Cell 4-16 | F6/F1 | kPa (psi) | Varies | ||||||||||||||||||
3-4 Shift Time Error | F4 | Seconds | Varies | ||||||||||||||||||
3-4 Shift Time | F0, F4 | Seconds | Varies | ||||||||||||||||||
3-4 TAP Cell 4-16 | F6/F2 | kPa (psi) | Varies | ||||||||||||||||||
Brake Switch | F0, F1 | Applied/Released | Released | ||||||||||||||||||
Current Gear | F0, F1, F2, F3, F4, F5 | 1, 2, 3, 4 | 1 | ||||||||||||||||||
ECT | F0, F1 | °C (°F) | 85-105°C (185-220°F) | ||||||||||||||||||
Engine Speed | F0, F1, F2, F3, F4, F5 | RPM | Varies | ||||||||||||||||||
Engine Torque | F0, F1 | N·m (lb ft) | Varies | ||||||||||||||||||
Gear Ratio | F0, F2, F3, F4 | Ratio | 3.98 | ||||||||||||||||||
Ignition 1 | F0 | Volts | 12.6-14.7 | ||||||||||||||||||
Last Shift Time | F0 | Seconds | Varies | ||||||||||||||||||
PC Sol. Actual Current | F0, F5 | Amps | Varies | ||||||||||||||||||
PC Sol. Duty Cycle | F0, F5 | % | Varies | ||||||||||||||||||
PC Sol. Ref. Current | F0, F5 | Amps | Varies | ||||||||||||||||||
TCC Duty Cycle | F0, F1 | % | 0% | ||||||||||||||||||
TCC Release Pressure | F0, F1 | Yes/No | Yes | ||||||||||||||||||
TCC Slip Speed | F0, F1 | RPM | Varies | ||||||||||||||||||
TFP Sw. | F0 | Park/Neutral, Reverse, Drive or Invalid | Park/Neutral | ||||||||||||||||||
TFP Sw. Sig. B/Sig. C | F0 | HI/LOW | LOW/HI/HI | ||||||||||||||||||
TP Angle | F0, F1, F2, F3, F4, F5 | % | 0% | ||||||||||||||||||
Transmission Range | F0 | Park, Reverse, Neutral, Drive, 3rd, 2nd, 1st, or invalid | Park | ||||||||||||||||||
TR Sw. -P/A/B/C | F0 | On/Off | On/On/Off/Off | ||||||||||||||||||
Trans. Fluid Temp. | F0, F1, F5 | °C (°F) | Varies | ||||||||||||||||||
Transmission ISS | F0, F1, F2, F3, F4 | RPM | Varies | ||||||||||||||||||
Transmission OSS | F0, F1, F2, F3, F4 | RPM | 0 | ||||||||||||||||||
Vehicle Speed | F0, F1, F2, F3, F4 | km/h (mph) | 0 | ||||||||||||||||||
*Data List Legend
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