Use the scan tool data listed in this table for comparison after the Diagnostic System Check-Engine Controls and finding the on-board diagnostics function properly with no diagnostic codes displayed.
The Typical Scan Tool Data Values are an average of display values recorded from normally operating vehicles. The Typical Scan Tool Data Values are intended to represent what a normally functioning system would display. The values you get may vary due to a low battery charge or other reasons. But they should be very close.
Do not use a scan tool that displays incorrect data. Report the problem to the manufacturer. The use of a improperly functioning scan tool can result in misdiagnosis and unnecessary parts replacement.
Use only the parameters listed in the tables for diagnosis. If a scan tool reads other parameters, the values are not recommended by General Motors for use in diagnosis. For more description on the values and the use of the scan tool diagnosis the powertrain control module (PCM) inputs, refer to the applicable diagnosis. If all values are within the range illustrated, refer to Symptoms - Engine Controls .
Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
Engine Idling/Lower Radiator Hose Hot/Closed Throttle/Park or Neutral/Accessories Off | |||
A/B/C Range Switch | Engine Data 1 | On/On On/Off Off/Off | On/Off/On |
A/C Compressor | Engine Data 1 | Engaged/Disengaged | Disengaged |
A/C Relay | Engine Data 1 | On/Off | Off |
A/C Request | Engine Data 1 | Yes/No | No |
Accelerator Pedal Pos. 1 | Engine Data 1 | Volts | 0.44-0.95 |
Accelerator Pedal Pos. 2 | Engine Data 1 | Volts | 3.9-4.5 |
Accelerator Pedal Pos. 3 | Engine Data 1 | Volts | 3.6-4.1 |
Actual Inj. Pump Timing | Engine Data 1 | Degree | 4-13.1 |
APP Angle | Engine Data 1 | % | 0 |
BARO | Engine Data 1 | kPa | 65-104 This varies with altitude. |
Boost Pressure Sensor | Engine Data 1 | kPa/psi | 60-170 kPa (All RPM) |
Brake Switch | Engine Data 1 | Open/Closed | Open |
Calc. A/C Load | Engine Data 1 | Counts | 0 |
Crank Reference Missed | Engine Data 1 | Counts | 0 |
Cruise Active | Engine Data 1 | On/Off | Off |
Cruise Brake Switch | Engine Data 1 | Open/Closed | Closed |
Cruise Switch | Engine Data 1 | On/Off | Off |
Desired Idle Speed | Engine Data 1 | RPM | 630-650 |
Desired Inj. Pump Timing | Engine Data 1 | Degree | 4-10 (at idle) 14-20 (at 2500 RPM) |
DTC Set This Ignition | Engine Data 1 | Counts | Yes/No |
ECT | Engine Data 1 | °C/°F | 85-105°C (85-220°F) (varies with the temperature) |
ECT Sensor | Engine Data 1 | Volts | 2-3 |
Engine Load | Engine Data 1 | % | 4-8 |
Engine Run Time | Engine Data 1 | Hrs/Mins/Sec | Varies with engine run time |
Engine Speed | Engine Data 1 | RPM | plus or minus 100 RPM from desired |
Engine Torque | Engine Data 1 | ft lb | 6-10 |
ESO Solenoid | Engine Data 1 | On/Off | On |
Fuel Rate | Engine Data 1 | mm3 | 7-15 |
Fuel Temperature Sensor | Engine Data 1 | °C/°F | 10-90°C (50-194°F) |
Glow Plug | Engine Data 1 | Volts | 0.0 |
Glow Plug System | Engine Data 1 | Disable/Enabled | Enabled on key up The times vary with the temperature. |
Glow Plug System Type | Engine Data 1 | Federal/California | Enabled/Disabled |
IAT | Engine Data 1 | °C/°F | 10-90°C (50-194°F) (The temperatures may increase during heavy engine loads) |
Ignition Voltage | Engine Data 1 | Volts | 8-16 volts |
Inj. Pump CAM Reference Missed | Engine Data 1 | Counts | 0 |
Inj. Pump Sol. Closure Time | Engine Data 1 | mS | 1.70-1.90 |
Lift Pump | Engine Data 1 | Volts | 12-16 (0.6 volts more than the ignition voltage) |
Lift Pump System | Engine Data 1 | Disabled/Enabled | Enabled |
MIL | Engine Data 1 | On/Off | Off |
Number Of DTCs | Engine Data 1 | Counts | 0 |
PCM/VCM in VTD Fail Enable | Engine Data 1 | Yes/No | No |
Resume Switch | Engine Data 1 | On/Off | Off |
Service Throttle Soon Lamp | Engine Data 1 | On/Off | Off |
Set Switch | Engine Data 1 | On/Off | Off |
Startup ECT | Engine Data 1 | °C/°F | varies The ECT at the time of the engine start up. |
TDC Offset | Engine Data 1 | Degree | +0.75 to -1.75 The factory setting varies per engine. |
Trans. Fluid Temp. | Engine Data 1 | °C/°F | 50-70°C (122-158°F) |
Transmission Range | Engine Data 1 | Park Neutral Reverse Overdrive Drive 3 Drive 2 Drive 1 | Park/Neutral |
Vehicle Speed | Engine Data 1 | km/h/mph | 0 |
VTD Auto Learn Timer | Engine Data 1 | Active/Inactive | Inactive |
VTD Fuel Disable | Engine Data 1 | Active/Inactive | Inactive |
VTD Fuel Disable Until Ign. Off | Engine Data 1 | Yes/No | No |
Wastegate Solenoid | Engine Data 1 | % | 50-70 |
1-2 Sol. | Engine Data 1 | On/Off | On |
2-3 Sol. | Engine Data 1 | On/Off | Off |
Freeze Frame and Failure Record--Additional parameters are found in FF and FR. | |||
Fail Counter | Freeze Frame and Failure Record | decimal | The number of times since the DTC has failed |
First Odometer | Freeze Frame and Failure Record | km/h/mph | miles since first failure |
Last Odometer | Freeze Frame and Failure Record | km/h/mph | miles since last failure |
Not Run Counter | Freeze Frame and Failure Record | decimal | A number of times without a pass or fail |
Pass Counter | Freeze Frame and Failure Record | decimal | A number of times since the DTC has passed |
