Use the scan tool data list under the following conditions:
| • | The Powertrain On-Board Diagnostic (OBD) System Check is complete |
| • | The On-Board Diagnostics are functioning properly |
| • | No 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 | Typical Data Values | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1-2 Shift Error | F2,F6 | Seconds | Varies | ||||||||||||||||
1-2 Shift Time | F0,F2,F6 | Seconds | Varies | ||||||||||||||||
1-2 Sol. | F0,F2,F3,F4 | On/Off | On | ||||||||||||||||
1-2 Sol. Open/Short to GND | F2 | Yes/No | No | ||||||||||||||||
1-2 Sol. Short to Volts | F2 | Yes/No | No | ||||||||||||||||
1-2 TAP Cell (4-16) | F6 | kPa/Psi | Varies | ||||||||||||||||
2-3 Shift Error | F3,F7 | Seconds | Varies | ||||||||||||||||
2-3 Shift Time | F0,F3,F7 | Seconds | Varies | ||||||||||||||||
2-3 Sol. | F0,F2,F3,F4 | On/Off | Off | ||||||||||||||||
2-3 Sol. Open/Short to GND | F3 | Yes/No | No | ||||||||||||||||
2-3 Sol. Shorted to Volts | F3 | Yes/No | No | ||||||||||||||||
2-3 TAP Cell (4-16) | F7 | kPa/Psi | Varies | ||||||||||||||||
3-4 Shift Error | F4 | Seconds | Varies | ||||||||||||||||
3-4 Shift Time | F0,F4 | Seconds | Varies | ||||||||||||||||
4WD | F0 | Enabled/Disabled | Disabled | ||||||||||||||||
4WD Low | F0 | Enabled/Disabled | Disabled | ||||||||||||||||
A/C Clutch | F0 | On/Off | Off | ||||||||||||||||
Cruise | F0 | Enabled/Disabled | Disabled | ||||||||||||||||
Current Gear | F0,F1,F2,F3,F4,F5 | 1,2,3,4 | 1 | ||||||||||||||||
Current TAP Cell | F6,F7 | 0-16 | Varies | ||||||||||||||||
ECT | F0,F1 | °C (°F) | Varies | ||||||||||||||||
Engine Run Time | F0 | Hr:Min:Sec | Varies | ||||||||||||||||
Engine Speed | F0,F1,F2,F3,F4,F5 | RPM | 600-800 | ||||||||||||||||
Engine Torque | F0,F1 | N·m (lb ft) | 10 | ||||||||||||||||
Gear Ratio | F0,F2,F3,F4 | Ratio | 3.98:1 | ||||||||||||||||
Ignition Voltage | F0 | Volts | 13.5-14.5 | ||||||||||||||||
P1870 Slip Counter | F0,F1 | Counts | Varies | ||||||||||||||||
Last Shift Time | F0 | Seconds | Varies | ||||||||||||||||
PC Sol. Actual Current | F0,F5 | Amps | 0.92 amps | ||||||||||||||||
PC Sol. Duty Cycle | F0,F5 | Percent On Time | Varies | ||||||||||||||||
PC Sol. Ref. Current | F0,F5 | Amps | 0.92 amps | ||||||||||||||||
Power Take Off | F0,F1 | On/Off | Off | ||||||||||||||||
Speed Ratio | F0,F1,F2,F3,F4 | Ratio | 8.00:1 | ||||||||||||||||
TCC Brake Switch | F0,F1 | Open/Closed | Closed | ||||||||||||||||
TCC Duty Cycle | F0,F1 | Percent | 0% | ||||||||||||||||
TCC Duty Cycle Open Short to GND | F1 | Yes/No | No | ||||||||||||||||
TCC Duty Cycle Short to Volts | F1 | Yes/No | No | ||||||||||||||||
TCC Slip Speed | F0,F1 | RPM | +/- 150 | ||||||||||||||||
TFP Sw. | F0 | Park/Neutral, Reverse, Drive4, Drive3, Drive2, Drive1 or Invalid | Park/Neutral | ||||||||||||||||
TFP Sw. A/B/C | F0 | HI/LOW | HI/LOW/HI | ||||||||||||||||
TFT Sensor | F0,F1,F5 | Volts | Varies | ||||||||||||||||
Tow/Haul Mode | F0 | Active/Inactive | Inactive | ||||||||||||||||
TP Angle (Vehicles w/o Traction Control) | F0,F1,F2,F3,F4,F5 | Percent | 0% | ||||||||||||||||
TP Indicated Angle (Vehicles with Traction Control) | F0,F1,F2,F3,F4,F5 | Percent | 0-10% | ||||||||||||||||
TP Sensor (Vehicles w/o Traction Control) | F0,F1,F2,F3,F4 | Volts | 0.3-0.9 V | ||||||||||||||||
Traction Control (6.0 L only) | F0 | Active/Inactive | Inactive | ||||||||||||||||
TR Sw. | F0 | Park, Reverse, Neutral, Drive4, Drive3, Drive2, Drive1, Invalid | Park | ||||||||||||||||
TR Sw. A/B/C/P | F0 | HI/LOW | LOW/HI/HI/LOW | ||||||||||||||||
Transfer Case Ratio | F0,F2,F3,F4 | Ratio | 3.22:1 | ||||||||||||||||
Trans. Fluid Temp. | F0,F1,F5 | °C (°F) | Varies | ||||||||||||||||
Transmission Hot Mode | F0,F1 | On/Off | Off | ||||||||||||||||
Transmission ISS | F0,F1,F2,F3,F4 | RPM | 600-800 | ||||||||||||||||
Transmission OSS | F0,F1,F2,F3,F4 | RPM | 0 | ||||||||||||||||
Turbine Speed | F0,F1,F2,F3,F4 | RPM | 600-800 | ||||||||||||||||
Vehicle Speed | F0,F1,F2,F3,F4 | km/h (mph) | 0 | ||||||||||||||||
*Data List Legend
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