GM Service Manual Online
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