Tech 1 Data Value Examples. Chevrolet Brazil Blazer 1997

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 are displayed, you may use the Typical Scan Tool Data Values in the table below for comparison. These values are an average of display values recorded from normally operating vehicles.

Important: 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.

The values below were recorded under the following conditions:

• | Engine is at Idle

• | Upper radiator hose is hot

• | Closed throttle

• | Gear is in Park or Neutral

• | Closed Loop

• | Accessories are OFF

#### Typical Scan Tool Data Values

Tech 1 Parameter | Units Displayed | Typical Scan Values
--- | --- | ---
MAP | kPa | 20-48 kPa, depending upon altitude
BARO | kPa | 70-104 kPa, depending upon altitude
TP Sensor | volts | 0.3-0.9 V
TP Angle | percent | 0%
Engine Speed | RPM | +/-100 RPM from Desired Idle
Desired Idle | RPM | +/-100 RPM from Engine Speed
Current DTC Set | Yes/No | No
ECT Sensor | volts | varies
TFT | °C(°F) | varies
TFT Sensor | volts | varies
Trans. OSS | RPM | 0
TCC Duty Cycle | Percentage | 0%
TCC Enable | Yes/No | No
TCC Slip Speed | RPM | +/-50 RPM from the Engine Speed
Brake Switch | Closed/Open | Closed
TCC Ramp | Seconds | 0.00
TCC Apply | Seconds | 0.00
TCC Out of Range | Yes/No | No
TCC Min. TP | Yes/No | No
TCC Delta TP | Yes/No | No
TCC Duty Open | Yes/No | No
TCC Duty Shorted | Yes/No | No
TCC Enable Open | Yes/No | No
TCC Enable Short | Yes/No | No
MPH (km/h) | 0-158 (0-255) | 0
MAP Sensor | Volts | 1-2 V, depending on altitude
Engine Run Time | hr/min/sec | varies
Ignition 1 | Volts | varies
ECT | °C(°F) | varies
PC Ref. Current | amps | varies (0.1-1.1 amps)
PC Act. Current | amps | varies (0.1-1.1 amps)
PC Duty Cycle | percentage | varies
PC Sol. Low Volts | Normal/Low Volts | Normal
TFP Switch A/B/C | On/Off | Off/On/Off
Power Enrichment | Yes/No | No
Cruise Enabled | Yes/No | No
A/C Clutch | Yes/No | No
Kickdown Enabled | Yes/No | No
4WD Low | Yes/No | No
4WD | Yes/No | No
Current TAP | 0-16 | 0
Hot Mode | Yes/No | No
Adaptable Shift | Yes/No | No
Long Shift Delay | Yes/No | No
Long Shift Time | Yes/No | No
TP Range | Yes/No | Yes
TP Delta | Yes/No | No
VSS Delta | Yes/No | No
Max TAP | Yes/No | No
Trans. Range | Error, Reverse, Overdrive, Drive 3, Drive 2, Low 1, P/N | P/N
Turbine Speed | N/A | --
Input Speed | N/A | --
1-2 Sol. | On/Off | On
2-3 Sol. | On/Off | On
Current Gear | 1,2,3,4 | 1
1-2 Shift Time | seconds | varies
2-3 Shift Time | seconds | varies
1-2 Shift Error | seconds | varies
2-3 Shift Error | seconds | varies
3-4 Shift Time | seconds | varies
3-4 Shift Error | seconds | varies
3-2 DS Sol. | Yes/No | varies based on TFT
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
Shift Delay | seconds | 0.00
Speed Ratio | Ratio | 8.00:1
Shift Pattern | number | 8
Start of Shift | Yes/No | Yes
End of Shift | Yes/No | Yes
Upshift | Yes/No | No
Shift Completed | Yes/No | Yes
Gear Ratio | N/A | --