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 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 at idle |
| • | Upper radiator hose is hot |
| • | Closed throttle |
| • | In Park |
| • | Closed Loop |
| • | Accessories OFF |
| • | Brake not applied |
Tech 1 Parameter | Units Displayed | Typical Scan Values | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
MAP | kPa, V | Varies | ||||||||
BARO | kPa, V | Varies | ||||||||
TP Sensor | V | Varies | ||||||||
TP Angle | % | 0% | ||||||||
A/C Clutch | Off/On | Off | ||||||||
Cruise Enabled | Off/On | Off | ||||||||
Hot Mode | Yes/No | No | ||||||||
Adaptable Shift | Yes/No | No | ||||||||
Curr. TAP Memory | -16 to +16 | Varies | ||||||||
Current TAP | 0-16 | Varies | ||||||||
Long Shift Delay | No/Yes | No | ||||||||
Long Shift Time | No/Yes | No | ||||||||
TP Range | Normal/Exceeded | Normal | ||||||||
Standard TAP | Yes/No | Yes | ||||||||
VSS Delta | Normal/Exceeded | Normal | ||||||||
TP Delta | Normal/Exceeded | Normal | ||||||||
Engine Run Time | Hr:Min:Sec | Varies | ||||||||
History MALFS | Number # | 0 | ||||||||
Active MALFS | Number # | 0 | ||||||||
Ignition Volts | Volts | 13.1-14.0 | ||||||||
TCC Release Pres | Yes/No | Yes | ||||||||
Current Gear | 1, 2, 3, 4 | 1 | ||||||||
Gear Ratio | Ratio | Varies 1:3.98 | ||||||||
TFT Sensor | C° (F°) | 86°C (187°F) (Varies with Trans temp.) | ||||||||
ECT | C° (F°) | 88°C (191°F) (Varies with coolant temp.) | ||||||||
TCC Duty Cycle | Percentage (%) | 0% | ||||||||
TCC Release Sw. | Open/Closed | Open | ||||||||
TCC Slip Speed | RPM | Varies | ||||||||
Brake Switch | Open/Closed | Closed | ||||||||
1-2 Sol/2-3 Sol | Off/On | On/Off | ||||||||
TFP Swtch A/B/C | Off/On | On/Off/Off | ||||||||
MAF | g/s | 3-6 g/s at idle; 13-16 g/s at 2500 RPM, depending upon load and BARO | ||||||||
TCC PWM Solenoid | % | 9% | ||||||||
TCC Enable | ON/OFF | OFF | ||||||||
TCC Enable Open | ON/OFF | OFF | ||||||||
TCC Enable Short | ON/OFF | OFF | ||||||||
TCC PWM Open | ON/OFF | OFF | ||||||||
TCC PWM Short | ON/OFF | OFF | ||||||||
Vehicle Speed | mph (km/h) | 0 | ||||||||
1/2 Sol. Open | ON/OFF | OFF | ||||||||
1/2 Sol. Short | ON/OFF | OFF | ||||||||
2/3 Sol. Open | ON/OFF | OFF | ||||||||
2/3 Sol. Short | ON/OFF | OFF | ||||||||
Speed Ratio | RPM | 7 RPM | ||||||||
2 Gear Start Lamp | ON/OFF | OFF | ||||||||
Traction Control | Not Available | -- | ||||||||
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 | ||||||||
Latest Shift | Seconds | Varies | ||||||||
Latest Shift Err | Seconds | Varies | ||||||||
Shift Delay | Seconds | Varies | ||||||||
Upshift Request | No/Yes | No | ||||||||
Upshift | No/Yes | No | ||||||||
Upshift Desired | No/Yes | No | ||||||||
DS Requested | No/Yes | No | ||||||||
DS in Progress | No/Yes | No | ||||||||
DS Desired | No/Yes | No | ||||||||
Latest Shift | Seconds | Varies | ||||||||
MPH/Km/h | mph/km/h | 0 | ||||||||
Engine Speed | RPM | Varies +/- 100 RPM from desired | ||||||||
PC Act. (Actual) Current | Amps | Varies | ||||||||
PC Ref. Current | Amps | Varies | ||||||||
PC Duty Cycle | Percentage (%) | Varies | ||||||||
TP Angle | Percentage (%) | 0% | ||||||||
PC Pressure | psi | Varies | ||||||||
PC Enabled | Off/On | On | ||||||||
Kickdown Enabled | No/Yes | No | ||||||||
Power Enrichment | Active/Inactive | Inactive | ||||||||
Trans. ISS | RPM | Varies | ||||||||
Trans. OSS | RPM | 0 | ||||||||
Loop Status | Open/Closed | Closed | ||||||||
TR Switch | Invalid, Low, Drive 2, Drive 3, Overdrive, Neutral, Reverse, Park | Park | ||||||||
TR Switch | Low/High |
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