For 1990-2009 cars

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 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.

Never use a scan tool that displays faulty data. The condition should be reported to the manufacturer. 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:

• | Idle

• | Upper radiator hose is hot

• | Closed throttle

• | Park or Neutral

• | Closed Loop

• | Accessories OFF

• | Brake not applied

#### Scan Tool Data Value Examples (4T60-E)

Parameter | Units Displayed | Typical Data Values
--- | --- | ---
Engine Torque | N·m (lb ft.) | 14-25 N·m (10-18 lb ft.)
TP Sensor | Volts | 0.5-0.7Volts
TP Angle | % | 0%
Engine Speed | RPM | 700 RPM
Transmission OSS | RPM | 0 RPM
Vehicle Speed | Km/h (mph) | 0 Km/h (0 mph)
Current Gear | 1, 2, 3, 4 | 1
1-2 Sol. | On/Off | On
2-3 Sol. | On/Off | On
Gear Ratio | 0.00 | 2.90
Speed Ratio | 0.00 | 8.00
1-2 Sol. open/Short to GND | Yes/No | No
1-2 Sol. Short to Volts | Yes/No | No
2-3 Sol. open/Short to GND | Yes/No | No
2-3 Sol. Short to Volts | Yes/No | No
ECT | °C (°F) | 85-105°C (185-220°F) (varies with the outside temperature)
IAT | °C (°F) | 0-90°C (32-194°F) (varies with the outside temperature)
Trans. Fluid Temp. | °C (°F) | 60-90°C (140-194°F) (varies with the outside temperature)
TFT Sensor | Volts | 1.95-3.0 V (varies with the outside temperature)
Hot Mode | On/Off | Off
Brake Switch | Open/Closed | Closed
TCC Enable | Yes/No | No
TCC Duty Cycle | % | 9%
TCC Slip Speed | RPM | Same as Engine Speed
TCC Enable Open/Short to GND | Yes/No | No
TCC Enable Short to Volts | Yes/No | No
TCC Duty Cycle Open/Short to GND | Yes/No | No
TCC Duty Cycle Short to Volts | Yes/No | No
Engine Run Time | Hour/Minute/Second | Time since startup
Ignition Voltage | Volts | 12-14Volts
Cruise | Enabled/Disabled | Disabled
A/C Clutch | On/Off | Off
Shift Mode | Normal/Performance | Normal
Traction Control | Inactive/Active | Inactive