Use the scan tool data listed in this table for comparison after the On-Board Diagnostic system check 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 faulty data. Report the problem to the manufacturer. The use of a faulty 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 PCM inputs, refer to the applicable diagnosis. If all values are within the range illustrated, refer to Driveability Symptoms.
Engine Idling/Lower Radiator Hose Hot/Closed Throttle/Park or Neutral/Accessories Off | ||||
|---|---|---|---|---|
Scan Tool Parameter | Data List | Units Displayed | Typical Data Value | Reference |
A/B/C Range Switch | Engine Data 1 | On On On/Off Off Off | On Off On | Automatic Transmission 4L80E |
A/C Compressor | Engine Data 1 | Engaged/Disengaged | Disengaged | Engine Scan Tool Data Definitions |
Accelerator Pedal Pos. 1 | Engine Data 1, MAF EGR Data | Volts |
| Information Sensors |
Accelerator Pedal Pos. 2 | Engine Data 1, MAF EGR Data | Volts |
| Information Sensors |
Accelerator Pedal Pos. 3 | Engine Data 1, MAF EGR Data | Volts |
| Information Sensors |
A/C Relay | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
A/C Request | Engine Data 1 | Yes/No | No | Engine Scan Tool Data Definitions |
Actual EGR | Engine 1 Data, MAF EGR Data | kPa | 80 - 104 kPa (All RPMs) | Engine Scan Tool Data Definitions |
Actual Inj. Pump Timing | Engine Data 1, MAF EGR Data | ° |
| Engine Scan Tool Data Definitions |
APP Angle | Engine Data 1, MAF EGR Data | % |
| Engine Scan Tool Data Definitions |
BARO | Engine Data 1, MAF EGR Data | kPa | 65 - 104 (varies with altitude) | Information Sensors |
Boost Pressure | Engine Data 1, MAF EGR Data | kPa/PSI | 60 - 170 kPa (All RPMs) | Information Sensors |
Brake Switch | Engine Data 1 | Open/Closed | Open | Information Sensors |
Calc. A/C Load | Engine Data 1 | Counts | 0 | Engine Scan Tool Data Definitions |
Clutch Pedal Switch | Engine Data 1 | Applied/ Released | Released | Information Sensors |
Crank Reference Missed | Engine Data 1 | Counts | 0 | Engine Scan Tool Data Definitions |
Cruise Active | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Cruise Brake Switch | Engine Data 1 | Open/Closed | Closed | Information Sensors |
Cruise Switch | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Cylinder Air | MAF EGR Data | g/cyl | 0.30 - 1.00 g/cyl (All RPMs) | Information Sensors |
Desired Cylinder Air | MAF EGR Data | g/cyl | 0.30 - 1.00 g/cyl (All RPMs) | Information Sensors |
Desired EGR | Engine 1 Data, MAF EGR Data | kPa | 80 - 104 kPa (All RPMs) | Engine Scan Tool Data Definitions |
Desired Idle Speed | Engine Data 1, MAF EGR Data | RPM | 630 - 650 | Engine Scan Tool Data Definitions |
Desired Inj. Pump Timing | Engine Data 1, MAF EGR Data | ° |
| Engine Scan Tool Data Definitions |
DTC Set This Ignition | Engine Data 1 | Counts | Yes/No | Engine Scan Tool Data Definitions |
ECT | Engine Data 1, MAF EGR Data | °C/ °F | 85°C - 105°C /185°F - 220°F (varies with temperature) | Information Sensors |
ECT Sensor | Engine Data 1, MAF EGR Data | Volts | 2 - 3 | Information Sensors |
EGR Adaptive Learn Matr. | MAF EGR Data | Counts | 0-4 | Information Sensors |
EGR Duty Cycle | Engine 1 Data, MAF EGR Data | kPa | 0 kPa (All RPMs) | Engine Scan Tool Data Definitions |
EGR Loop Status | MAF EGR Data | Open/Closed | Open | Information Sensors |
EGR Sensor | Engine 1 Data, MAF EGR Data | Volts | 4.60 - 4.85 volts (All RPMs) | Information Sensors |
EGR Vent Sol. | Engine 1 Data, MAF EGR Data | On/Off | Off | Information Sensors |
Engine Load | Engine Data 1 | % | 1-15 | Engine Scan Tool Data Definitions |
Engine Run Time | Engine Data 1, MAF, EGR Data | Hrs/Mins/Sec | Varies with engine run time | Engine Scan Tool Data Definitions |
Engine Speed | Engine Data 1, MAF EGR Data | RPM | +/-100 RPM from desired | Engine Scan Tool Data Definitions |
Engine Torque | Engine Data 1 | ft lb | 3-30 | Engine Scan Tool Data Definitions |
ESO Solenoid | Engine Data 1, MAF EGR Data | On/Off | On | Engine Scan Tool Data Definitions |
Four-Wheel Drive Low | Enabled/Disabled | Disabled | Automatic Transmission | Information Sensors |
Front Axle Switch | Locked/Unlocked | Unlocked | Automatic Transmission | Information Sensors |
Fuel Rate | Engine Data 1, MAF EGR Data | mm3 | 7 - 15 (All RPMs) | Engine Scan Tool Data Definitions |
Fuel Temperature Sensor | Engine Data 1, MAF EGR Data | °C/ °F | 10°C - 90°C /50°F - 194°F | Information Sensors |
Glow Plug | Engine Data 1 | Volts | 0.0-0.2 | Engine Scan Tool Data Definitions |
Glow Plug System | Engine Data 1, MAF EGR Data | Disable/Enabled | Enabled on key up (times varies with temperature) | Engine Scan Tool Data Definitions |
IAT | Engine Data 1, MAF EGR Data | °C/ °F | 10°C - 90°C /50°F - 194°F (temperatures may increase under heavy engine loads) | Information Sensors |
Ignition Voltage | Engine Data 1, MAF EGR Data | Volts | 12 - 14 (accuracy +/-0.4 volts) | Engine Scan Tool Data Definitions |
Inj. Pump CAM Reference Missed | Engine Data 1 | Counts | 0 | Engine Scan Tool Data Definitions |
Inj. Pump Sol. Closure Time | Engine Data 1, MAF EGR Data | mS | 1.70 - 1.90 (All RPMs) | Engine Scan Tool Data Definitions |
Lift Pump | Engine Data 1 | Volts | 12 - 16 (0.6 volts higher than ignition voltage) | Engine Scan Tool Data Definitions |
Lift Pump System | Engine Data 1/MAF EGR Data | Disabled/Enabled | Enabled | Engine Scan Tool Data Definitions |
MAF | MAF EGR Data | g/s |
| Information Sensors |
MAF Frequency | MAF EGR Data | Hz |
| Information Sensors |
MIL | Engine Data 1, MAF EGR Data | On/Off | Off | Engine Scan Tool Data Definitions |
Number Of DTCs | Engine Data 1 | Counts | 0 | Engine Scan Tool Data Definitions |
PCM in VTD Fail Enable | Engine Data 1 | Yes/No | No | Engine Scan Tool Data Definitions |
Resume Switch | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Service Throttle Soon Lamp | Engine Data 1, MAF EGR Data | On/Off | Off | Engine Scan Tool Data Definitions |
Set Switch | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Startup ECT | Engine Data 1, MAF EGR Data | °C/ °F | varies (ECT at time of engine startup) | Engine Scan Tool Data Definitions |
TDC Offset | Engine Data 1, MAF EGR Data | ° | +0.75 to -1.75 (factory setting varies per engine) | Engine Scan Tool Data Definitions |
Trans. Fluid Temp. | Engine Data 1 | °C/ °F | 50°C - 80°C/122°F - 158°F | Automatic Transmission 4L80E |
Transmission Range | Engine Data 1 | Park/Neutral/Reverse/Overdrive/Drive 3/Drive 2/Drive 1 | Park/Neutral | Automatic Transmission 4L80E |
Vehicle Speed | Engine Data 1, MAF EGR Data | MPH/km/h | 0 | Engine Scan Tool Data Definitions |
VTD Auto Learn Timer | Engine Data 1 | Active/Inactive | Inactive | Engine Scan Tool Data Definitions |
VTD Fuel Disable | Engine Data 1 | Active/Inactive | Inactive | Engine Scan Tool Data Definitions |
VTD Fuel Disable Until Ign. Off | Engine Data 1 | Yes/No | No | Engine Scan Tool Data Definitions |
Wastegate Solenoid | Engine Data 1, MAF EGR Data | % |
| Engine Scan Tool Data Definitions |
1 - 2 Sol. | Engine Data 1 | On/Off | On | Automatic Transmission 4L80E |
2 - 3 Sol. | Engine Data 1 | On/Off | Off | Automatic Transmission 4L80E |
