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 |
Engine Speed | Engine Data 1, MAF EGR Data | RPM | ±100 RPM from desired | Engine Scan Tool Data Definitions |
Desired Idle Speed | Engine Data 1, MAF EGR Data | RPM | 630 - 650 | 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 |
Startup ECT | Engine Data 1, MAF EGR Data | °C/ °F | varies (ECT at time of engine startup) | Engine Scan Tool Data Definitions |
ECT Sensor | Engine Data 1, MAF EGR Data | Volts | 2 - 3 | Information Sensors |
BARO | Engine Data 1, MAF EGR Data | kPa | 65 - 104 (varies with altitude) | Information Sensors |
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 |
MAF | MAF EGR Data | g/s | 20 - 35 g/s | Information Sensors |
MAF Frequency | MAF EGR Data | Hz | 4000 - 4500 Hz | Information Sensors |
ESO Solenoid | Engine Data 1, MAF EGR Data | On/Off | On | Engine Scan Tool Data Definitions |
Wastegate Solenoid | Engine Data 1, MAF EGR Data | % | 50 - 70 | Engine Scan Tool Data Definitions |
Boost Pressure | Engine Data 1, MAF EGR Data | kPa/PSI | 60 - 170 kPa (actual boost pressure can be determine by subtracting BARO) | Information Sensors |
Actual EGR | Engine 1 Data, MAF EGR Data | kPa | 80 - 104 kPa | Engine Scan Tool Data Definitions |
Desired EGR | Engine 1 Data, MAF EGR Data | kPa | 80 - 104 kPa | Engine Scan Tool Data Definitions |
EGR Duty Cycle | Engine 1 Data, MAF EGR Data | kPa | 0 kPa | Engine Scan Tool Data Definitions |
EGR Sensor | Engine 1 Data, MAF EGR Data | Volts | 4.60 - 4.85 volts | Information Sensors |
EGR Vent Sol. | Engine 1 Data, MAF EGR Data | On/Off | Off | Information Sensors |
EGR Adaptive Learn Matr. | MAF EGR Data | Counts | 0 | Information Sensors |
Cylinder Air | MAF EGR Data | g/cyl | 0.30 - 1.00 g/cyl | Information Sensors |
Desired Cylinder Air | MAF EGR Data | g/cyl | 0.30 - 1.00 g/cyl | Information Sensors |
Vehicle Speed | Engine Data 1, MAF EGR Data | MPH/km/h | 0 | 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 |
Fuel Rate | Engine Data 1, MAF EGR Data | mm3 | 7 - 15 | Engine Scan Tool Data Definitions |
Glow Plug | Engine Data 1 | Volts | 0.0 | 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 |
Desired Inj. Pump Timing | Engine Data 1, MAF EGR Data | ° | 4 - 10 | Engine Scan Tool Data Definitions |
Actual Inj. Pump Timing | Engine Data 1, MAF EGR Data | ° | 4 - 10 | Engine Scan Tool Data Definitions |
APP Angle | Engine Data 1, MAF EGR Data | % | 0 | Engine Scan Tool Data Definitions |
Accelerator Pedal Pos. 1 | Engine Data 1, MAF EGR Data | Volts | 0.44 - 0.95 | Information Sensors |
Accelerator Pedal Pos. 2 | Engine Data 1, MAF EGR Data | Volts | 3.9 - 4.5 | Information Sensors |
Accelerator Pedal Pos. 3 | Engine Data 1, MAF EGR Data | Volts | 3.6 - 4.1 | Information Sensors |
Inj. Pump Sol. Closure Time | Engine Data 1, MAF EGR Data | mS | 1.70 - 1.90 | 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 |
Ignition Voltage | Engine Data 1, MAF EGR Data | Volts | 12 - 14 (accuracy ±0.4 volts) | Engine Scan Tool Data Definitions |
Cruise Active | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Cruise Switch | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Brake Switch | Engine Data 1 | Open/Closed | Open | Information Sensors |
Cruise Brake Switch | Engine Data 1 | Open/Closed | Closed | Information Sensors |
Set Switch | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Resume Switch | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Crank Reference Missed | Engine Data 1 | Counts | 0 | Engine Scan Tool Data Definitions |
Inj. Pump CAM Reference Missed | Engine Data 1 | Counts | 0 | Engine Scan Tool Data Definitions |
Lift Pump | Engine Data 1 | Volts | 12 - 16 (.6 volts higher than ignition voltage) | Engine Scan Tool Data Definitions |
Lift Pump System | Engine Data 1 | Disabled/Enabled | Enabled | Engine Scan Tool Data Definitions |
Engine Load | Engine Data 1 | % | 4 - 8 | Engine Scan Tool Data Definitions |
Engine Torque | Engine Data 1 | ft lb | 7 - 10 | Engine Scan Tool Data Definitions |
Number Of DTCs | Engine Data 1 | Counts | 0 | Engine Scan Tool Data Definitions |
DTC Set This Ignition | Engine Data 1 | Counts | Yes/No | Engine Scan Tool Data Definitions |
MIL | Engine Data 1, MAF EGR Data | 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 |
Transmission Range | Engine Data 1 | Park/Neutral/Reverse/Overdrive/Drive 3/Drive 2/Drive 1 | Park/Neutral | Automatic Transmission 4L80E |
A/B/C Range Switch | Engine Data 1 | On On On/Off Off Off | On Off On | Automatic Transmission 4L80E |
1 - 2 Sol. | Engine Data 1 | On/Off | On | Automatic Transmission 4L80E |
2 - 3 Sol. | Engine Data 1 | On/Off | Off | Automatic Transmission 4L80E |
Trans. Fluid Temp. | Engine Data 1 | °C/ °F | 50°C - 70°C/122°F - 158°F | Automatic Transmission 4L80E |
TFT Sensor | Engine Data 1 | Volts | 1.8 - 2.2 | Engine Scan Tool Data Definitions |
Calc. A/C Load | Engine Data 1 | Counts | 0 | Engine Scan Tool Data Definitions |
A/C Request | Engine Data 1 | On/Off | 0 | Engine Scan Tool Data Definitions |
A/C Compressor | Engine Data 1 | Engaged/Disengaged | Disengaged | Engine Scan Tool Data Definitions |
A/C Relay | Engine Data 1 | On/Off | Off | Engine Scan Tool Data Definitions |
Engine Run Time | Engine Data 1 | Hrs/Mins/Sec | Varies with engine run time | Engine Scan Tool Data Definitions |
